|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
To earn THX certification, an amplifier must deliver clean, powerful sound effects, clear dialogue and dramatic musical scores under all room and speaker-load conditions. In fact, Lucas Films THX uses these amplifiers in their own studios for mixing the audio of THX certified home releases. But ADCOM's engineers went further than the stringent requirements of THX and created a home theater power amplifier that meets the demands of the most critical audiophiles as well.
The GFA-7500's five separate mono modules each produce 150 watts into 8 ohms and over 225 watts into 4 ohms from all five channels-- with all FIVE channels being driven simultaneously!! This "five-mono-amplifier" design guarantees the sonic integrity of each channel by completely eliminating any inter-channel cross-talk and ensuring full-power with minimal distortion from each individual channel, regardless of speaker impedance or efficiency. Since the theatrical sound mix for multi-channels will often place very different demands on the speakers for each channel, the ability to essentially treat them as "separate" from the amplifier's perspective delivers the maximum impact the film's sound engineers intended.
The GFA-7500 features a heavy-duty, twenty pound toroidal power transformer that delivers 2500 watts through five separate secondary taps. In addition, the120,000mF total storage capacitance bank easily delivers the large amounts of current demanded by today's power-hungry, low-impedance THX speaker systems. This oversized and generous power supply allows maximum power output over a wide and unrestricted dynamic range needed by the ever-increasing number of digital audio and audio/video recordings. With all this power ADCOM also wanted reliability and good sonics. To that end, a special protection circuit constantly monitors the 7500's operating parameters, yet it's completely outside the signal path so it won't compromise sound quality. Matched output devices for each channel help deliver the superb sound reperoduction expected of an ADCOM.
And because ADCOM designs products for tomorrow as well as today, the GFA-7500 has been designed to meet all the new 5.1 channel format requirements, including Dolby Digital (AC-3) and DTS, with full-bandwidth response down to the lowest frequencies.
You can be sure, whether you're listening to movies or music,
the GFA-7500 is the perfect choice for any stereo or multi-channel
home theater system, especially if you want the movies you play at
home to sound as live and exciting as their filmmakers
intended. Leave it to ADCOM - two thumbs up for performance
and value in cinema type sound.
|
|
|
Power Rating (To FTC Requirements)
IM Distortion (SMPTE)
IM Distortion (CCIF, Any Combination from 4kHz to 20kHz)
THD + Noise at 150 watts into 8 ohms (Typical)
THD + Noise at 225 watts into 4 ohms (Typical)
Frequency Response at 1 watt into 8 ohms (10Hz to 20kHz) ...........+ 0, - 0.25dB Power Bandwidth (-3dB) ...........1.5Hz to 100kHz Dynamic Headroom Into 4 ohms ...........1.9dB Signal to Noise Ratio, "A" Weighted (150 watts into 8 ohms) ...........> 115B |
Gain .......29dB Input Sensitivity
Input
Impedance Damping Factor ( 20Hz to 20kHz ) ........>800 Rise Time (5kHz, 90 V, peak-to-peak square wave, 20% to 80%) ........2.7 microseconds (uS)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Powered by an enormous toroidal transformer with multiple secondary windings, the GFA-7400 is capable of driving 100 watts RMS into all five channels simultaneously. Power of this magnitude is usually only achieved by connecting multiple amplifiers. But with the GFA-7400 you get all that power in a compact package at an affordable price.
Listen to a home theater system built around a GFA-7400 and you'll hear a level of clarity, imaging and depth that can only be found in amps costing two and three times as much. Its uncompressed dynamics and distortion free sound field make the most of any size room. The GFA-7400 adapts to fit your environment, so every entertainment event sounds as large and dynamic as the original performance.
And because it's an ADCOM, the GFA-7400 is as easy to use and understand as it is pleasurable to hear. All RCA input connections are gold plated for the highest quality sound reproduction and all controls are ergonomically configured for easy operation.
Dollar for dollar there isn't another five channel, home theater amplifier that can deliver this level of power, performance and sonic integrity. With ADCOM components, great sounding home theater is in the details.
|
|
|
Power Rating (To FTC Requirements) All Channels (each channel with all five being driven)
IM Distortion (SMPTE) All Channels
IM Distortion (CCIF, Any Combination from 4kHz to 20kHz) All Channels
Frequency Response at 1 Watt, all channels into 8 ohms 10Hz to 20kHz.....+0,-0.25dB Power Bandwidth (-3dB).....3Hz to 100kHz Dynamic Headroom into 4 Ohms (3 Front Channels) .....2.8dB Dynamic Headroom into 4 Ohms (2 Rear Channels) ......1.8dB |
Signal to Noise Ratio, "A" Weighted 100 watts into 8 ohms.....>110dB Gain (Level Controls at Maximum).....29dB Damping Factor 20Hz to 20kHz ( All Channels ).....>400 Rise Time 5kHz, 80V peak-to-peak square wave, 20% to 80% .....4.5uS
General Power (available in 230V on special order)115VAC/50-60Hz Chassis Dimensions 5"(127mm) x 17"(432mm) x 14"(355.6mm) Maximum Dimensions 5.75"(146mm) x 17"(432mm) x 15"(381mm) Weight.....42 lbs. Weight, packed.....48 lbs. |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Creating a big space, room-filling sound of home theater in a smaller space doesn't require a large amplifier. That's why we offer ADCOM's GFA-7300 Five-Channel Power Amplifier, designed for the home theater customer who needs a smaller yet powerful source for multi-channel home theater sound. Modeled after the larger GFA-7500 and GFA-7400 amplifiers, the GFA-7300 perfectly drives smaller systems with all the superior sonic characteristics of its bigger brothers, with all the dynamics at a lower power level.
Powered by an oversized toroidal transformer with multiple secondary windings, the GFA-7300 is capable of driving 60 watts RMS into all five channels simultaneously. Unlike many receivers, this is clean, high current power, exactly what you need to deliver all the impact and dynamics of home theater sound. With the GFA-7300 you get dynamic power in a compact package at an affordable price, with all the advantages of separates for the ultimate in multi-channel sound.
Listen to a home theater system built around a GFA-7300 and you'll hear a level of clarity, imaging and depth that can only be found in amps costing two and three times as much. Its uncompressed dynamics and distortion free sound field make the most of smaller size rooms. The GFA-7300 adapts to fit your environment, so every entertainment event sounds as large and dynamic as the original performance. For many people the GFA-7300 is the perfect power solution.
Because it's an ADCOM, the GFA-7300 is as easy to use and understand as it is pleasurable to hear. All RCA input connections are gold plated for the highest quality sound reproduction and all controls are ergonomically configured for easy operation.
Dollar for dollar there isn't another five channel, home theater amplifier that can deliver this level of power, performance and sonic integrity. With ADCOM components, great sounding home theater is in the details.
|
|
IM Distortion (SMPTE) All Channels
IM Distortion (CCIF, Any Combination from 4kHz to 20kHz) All Channels
Frequency Response at 1 Watt, all channels into 8 ohms 10Hz to 20kHz.....+0, -0.25dB Power Bandwidth (-3dB).....1.5Hz to 100kHz Dynamic Headroom into
4 Ohms (All Channels)
.....1.9dB |
Signal to Noise Ratio, "A" Weighted 60 watts into 8 ohms.....>115dB Gain (Level Controls at Maximum).....29dB Damping Factor 20Hz to 20kHz ( All Channels ).....>800 Rise Time 5kHz, 80V peak-to-peak square wave, 20% to 80% .....2.7uS Power Consumption - Continuous, All Channels Driven
General Power (available in 230V on special order)115VAC/50-60Hz Chassis Dimensions 4.25"(118mm) x 17"(432mm) x 14"(355.6mm) Maximum Dimensions 5.00"(127mm) x 17"(432mm) x 14.75"(375mm) Weight.....36 lbs. Weight, packed.....40 lbs. |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
The GFA-5802 is part of a high end, high performance series of separate components from Adcom. The other members include the GFP-750 preamp and GCD-750 single play CD unit. All three of these components were conceived as an advanced statement of Adcom's long standing philosophy of providing exceptional performance for the money. Actually, with these units our goal was to go beyond Adcom's traditional "great performance at a value price" and deliver the sonics, power, finesse, and sophistication of units costing two to three times as much! The fact that we exceeded our own expectations is a testament to our engineers' diligence and their unswerving dedication to these goals.
You need power to make power
In order to generate lots of output power an amplifier needs to draw even more power from the AC wall socket (some of those "wall watts" become heat, and some are simply "used up" by the amps circuits.) In a power amplifier the "wall current" is modified and ultimately delivered to the amplifier's working circuits by the input transformer, the AC to DC rectifiers, and the power supply filter capacitors (which act like a power reservoir, holding electrical current for the output stage till it's needed). Collectively these critical components are known as the Power Supply.
The all important power supply
The GFA-5802's power supply incorporates a huge, donut shaped,
toroidal input transformer. The advantage of a toroidal design is it
generates lower noise and offers less resistance to current flow than
standard transformer designs. This massive transformer at the heart
of the GFA-5802 means it can "pull" enormous amounts of power from
the AC line. It's also the first step on a design path leading to an
amplifier that can deliver equally large amounts of current, into any
conceivable speaker load.
After the toroidal transformer there's a series of rectifiers which
change the AC input power to DC. These too were chosen for their
ability to deliver high current, and are almost "idling", even at the
GFA-5802's full output power. Once modified by the rectifiers, the
electricity passes through to a bank of exceptionally large filter
capacitors, with over 100,000 microfarads of total power storage.
These are used to eliminate any residual noise in the voltage, and
they store the electrical energy until it's required by the
amplifiers internal circuits. They've been chosen to deliver all the
reserve power possibly necessary, even if the GFA-5802 is connected
to a 1 Ohm load!
In addition to the main transformer, the GFA-5802 includes a separate
power transformer for its input stages. This ensures that the input
stages are unaffected by large power demands made on the output
section. So a big crescendo won't adversely impact the music that
comes immediately after it.
Selected MosFet transistors throughout
All the low level signal stages of the GFA-5802 use Reference
Grade HexFet transistors exclusively. HexFet's are an advanced,
hybrid MosFet device known for their superior sound quality and
rugged reliability. These devices give you the dynamic, high impact
power of Bipolar transistors without any of the "brightness" or high
frequency "glare" so common with typical transistor amplifier
designs.
The output stages of the GFA-5802 (which actually have the job of
powering your loudspeakers) are made up of 32 high current MosFets
(14 continuous amperes per device). These are configured in a
quasi-complimentary manner. The result is a superbly smooth,
spectacular sounding output section, with practically unlimited
voltage and current capability. You simply won't find more high
quality, real, useable power unless you spend two to three times the
GFA-5802's modest price.
You've heard it before, but less is more
By utilizing HexFet and MosFet designs throughout the GFA-5802,
Adcom's engineers were able to design short, simple signal paths. A
quick glance at the GFA-5802's elegant glass epoxy circuit boards
will affirm this "less is more" philosophy. Reducing the number of
components and stages the signal travels through by definition
reduces the potential for distortion and fidelity loss. Taking this
approach even further, Adcom's engineers designed the GFA-5802 with
only three active gain stages, as opposed to the 5 or more found in
typical amplifier designs. Once again, the result is improved sound,
clarity, and imaging, not to mention enhanced reliability.
The GFP-750's low voltage gain stages are single ended Class A
designs, the most neutral and accurate of amplifier circuits.
Countless hours of critical listening have confirmed the sonic
superiority of these circuits. And they're direct coupled, which
eliminates capacitor connection between stages. Since capacitors are
filters by nature, direct coupling improves signal transfer and
purity.
Keepin' cool; Keepin' on Keepin' on
An important reason for using MosFet transistors in the output stage has to do with their rugged reliability. MosFets simply aren't affected by heat the way normal transistors are. Get the typical transistor really hot and it goes into "thermal runaway", drawing more and more current, getting hotter and hotter until poof; it's a gonner. MosFets on the other hand, reduce the amount of current they conduct if they become excessively hot. So they're self-controlling and therefore very reliable. Another advantage of this characteristic is it allows Adcom to bias the output stage of the GFA-5802 fairly high. This makes the GFA-5802 operate as a Class A amplifier under most normal listening conditions. When higher power demands come along, the amplifier "switches" to class A/B operation. So the GFA-5802 runs warm to the touch, but fear not, because its huge external heat sinks whisk away excess heat quickly, quietly, and efficiently.
A little extra insurance
A new, advanced protection circuit has been incorporated into the GFA-5802. It monitors the safe operating perimeters of the amplifier, and if they're exceeded, it protects the amplifier. This in itself is not unique, however Adcom's protection system operates entirely outside the signal path. So even though it offers excellent protection and peace of mind, it does so without the slightest sonic impact!
The finishing touches
The GFA-5802 is a powerhouse of an amplifier, with the manners and finesse of the most elegant audiophile components. No matter what kind of speakers you have, we're confident that putting a GFA-5802 in your system will make a sonic improvement. And with the money you save, you can buy lots of CDs (not to mention other Adcom components).
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Note: Many of the design features in the GFA-5503 are virtually identical to the GFA-5800 power amplifier. The primary difference between these amplifiers is power output. The circuit topology and design concepts are virtually identical.
Completely Separate Secondary Main Power Systems.
The GFA-5503 has a specially wound high power toroidal transformer which completely isolates the two channel secondary systems, not even sharing the ground connection. This eliminates ground loops and greatly reduces the possible interactions between power channels.
High Capacitance Storage
Each channel has nearly 120 Joules of energy storage, adequate for 14 kilowatts of power at 10% ripple. Under normal operation, the power supply ripple voltage is less than 1%.
Separate High Voltage Front End Supplies
The front end circuitry of each channel is supplied power by its own high voltage system - including separate transformer windings, bridge rectifiers and filter capacitors for each channel. This eliminates interaction between the early gain stages of the amplifier and the high power occurring in the output stages. The front end system is operated at a higher voltage than the output stage. This not only improves the distortion characteristic of the front end, but allows the front end to drive the output stage to its supply rails - obtaining every bit of available power to the load.
In Rush Limiting
The power supplies feature inrush limiting which prevents the high current surges which would normally accompany the charge cycle of the transformer and the power supply capacitors on turn-on.
100% MOSFET Construction
All audio elements of the amplifier are Power Mosfets Even the input transistors are power devices, capable of as much as 2 amps of current by themselves. The transconductance characteristic of Mosfets have a number of advantages which are put to good use. Their high input impedance allow for the use of an extremely simple gain path, and their negative thermal characteristics give high thermal stability, allowing high output stage bias, low offset voltages, and very high output current and voltage with reliable operation. The characteristics of the Power Mosfets are sonically superior to the Bipolar transistor, delivering all of the muscle of Bipolar circuitry with the sweeter qualities found in tube equipment.
Ultra Simple Gain Path
Most high end amplifiers have at least 5 successive gain stages associated with their signal path. Some have even more. The GFA-5503 achieves all of its performance with only three. That's two stages less for the signal to travel through, and it makes a difference.
Single Ended Class A Front End Circuitry
The front end circuitry is single ended Class A. Single ended is the purest form of Class A operation, and yields the most pleasing sonic characteristics. It is also the most stable class because the gain devices are biased by constant sources which do not vary their bias under changing temperature or dynamic conditions.
Doubly Regulated Active Current Sources
The current sources in the GFA-5503 are doubly regulated for absolute stability. This stability gives the front end circuitry the ability to ignore supply fluctuations, noise and signals from the other channel (crosstalk). It also provides operation which does not vary with temperature or age. The voltage references driving each source are filtered passively, with different time constants, which allowing for staggered turn-on of the sources, giving low turn-on thump.
Ultra Matched Devices
The output Mosfets are mated to within 2.5% of each other at the bias point, and the input devices are matched to within 0.25%. In the output stage this yields lower distortion and more reliable performance. Tighter tolerances also achieves lower output impedance (higher damping factor) and higher output currents. In the input stage, this yields lower distortion, lower DC offset voltages, and higher thermal stability.
Ultra Low Feedback
The very simple gain path has been configured for very low amounts of feedback. This contributes to the warm and musical quality of the sound and the high stability of the amplifier with a wide variety of loads.
High Power Output Stage
The amplifier uses International Rectifier Hexfets exclusively in all gain stages. The output stage uses the highest Power Mosfet types available. The output stage of each channel is capable of withstanding transients of about 3 kilowatts.
High Current Output
Each channel uses 10 Power Mosfet output devices. These devices are each rated to handle 20 amps of output current. This output capacity is adequate to deliver full power into 2 ohm loads, and the amplifier is completely stable driving 1 ohm or less.
Low Impedance Performance
The amplifier does not produce significantly higher distortion readings into low impedance loads, unlike other amplifiers on the market. Watt for watt, the distortion into 2 ohms is only slightly higher than that into 8 ohms.
Near Class A Bias
Each channel of the amplifier is biased at about 50 watts idle current. This is a lot, and represents near-Class A operation for most listening levels, giving depth and ambiance to its sound. The distortion curve is monotonic, (distortion decreases with level) and is primarily 2nd harmonic at listening levels.
Thermal and Error Warning Indicators
Each channel has a LED to indicate over temperature or excessive distortion.
Modular Channel Construction
All of the active circuitry for each channel is on a single printed circuit board mounted on the heat sink. This assures short signal paths, accurate wiring placement, and allows for easier servicing. Outboard heatsinks provide the necessary air circulation to allow the output devices to operate within their specified temperature range.
Power Rating (To FTC
Requirements) IM Distortion (SMPTE)
IM Distortion (CCIF,
Any Combination from 4kHz to 20kHz) THD + Noise at 200
watts into 8 Ohms (Typical) THD + Noise at 350
watts into 4 Ohms (Typical) Frequency Response at
1 Watt Into 8 Ohms 10Hz to 20kHz.....+0, -0.25dB Power Bandwidth
(-3dB).....3hz to
130kHz Dynamic Headroom into
4 Ohms.....1.7dB Signal to Noise Ratio,
A Weighted 200 watts into 8
ohms.....> 100dB Gain.....29dB Input
impedance.....49.9k
ohms Damping Factor 20Hz to
20kHz.....> 700 Rise Time
5kHz, 120V peak-to-peak square wave, 20%
to 80%.....1.5uS Power Consumption
(Continuous, Both Channels Driven) Power (available in
230V by special order).....115VAC
50/60Hz Chassis Dimensions
7" (178mm) x 17" (432mm) x 13 3/4"
(349mm) Maximum Dimensions
7 1/4" (184mm) x 17" (432mm) x 14 3/4"
(375mm) Weight.....44
lbs. (20kg) Weight
Packed.....50 lbs.
(23kg)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Note: Many of the design features in the GFA-5500 are virtually identical to the GFA-5800 power amplifier. The primary difference between these amplifiers is power output. The circuit topology and design concepts are virtually identical.
Completely Separate Secondary Main Power Systems.
The GFA-5503 has a specially wound high power toroidal transformer which completely isolates the two channel secondary systems, not even sharing the ground connection. This eliminates ground loops and greatly reduces the possible interactions between power channels.
High Capacitance Storage
Each channel has nearly 120 Joules of energy storage, adequate for 14 kilowatts of power at 10% ripple. Under normal operation, the power supply ripple voltage is less than 1%.
Separate High Voltage Front End Supplies
The front end circuitry of each channel is supplied power by its own high voltage system - including separate transformer windings, bridge rectifiers and filter capacitors for each channel. This eliminates interaction between the early gain stages of the amplifier and the high power occurring in the output stages. The front end system is operated at a higher voltage than the output stage. This not only improves the distortion characteristic of the front end, but allows the front end to drive the output stage to its supply rails - obtaining every bit of available power to the load.
In Rush Limiting
The power supplies feature inrush limiting which prevents the high current surges which would normally accompany the charge cycle of the transformer and the power supply capacitors on turn-on.
100% MOSFET Construction
All audio elements of the amplifier are Power Mosfets Even the input transistors are power devices, capable of as much as 2 amps of current by themselves. The transconductance characteristic of Mosfets have a number of advantages which are put to good use. Their high input impedance allow for the use of an extremely simple gain path, and their negative thermal characteristics give high thermal stability, allowing high output stage bias, low offset voltages, and very high output current and voltage with reliable operation. The characteristics of the Power Mosfets are sonically superior to the Bipolar transistor, delivering all of the muscle of Bipolar circuitry with the sweeter qualities found in tube equipment.
Ultra Simple Gain Path
Most high end amplifiers have at least 5 successive gain stages associated with their signal path. Some have even more. The GFA-5503 achieves all of its performance with only three. That's two stages less for the signal to travel through, and it makes a difference.
Single Ended Class A Front End Circuitry
The front end circuitry is single ended Class A. Single ended is the purest form of Class A operation, and yields the most pleasing sonic characteristics. It is also the most stable class because the gain devices are biased by constant sources which do not vary their bias under changing temperature or dynamic conditions.
Doubly Regulated Active Current Sources
The current sources in the GFA-5503 are doubly regulated for absolute stability. This stability gives the front end circuitry the ability to ignore supply fluctuations, noise and signals from the other channel (crosstalk). It also provides operation which does not vary with temperature or age. The voltage references driving each source are filtered passively, with different time constants, which allowing for staggered turn-on of the sources, giving low turn-on thump.
Ultra Matched Devices
The output Mosfets are mated to within 2.5% of each other at the bias point, and the input devices are matched to within 0.25%. In the output stage this yields lower distortion and more reliable performance. Tighter tolerances also achieves lower output impedance (higher damping factor) and higher output currents. In the input stage, this yields lower distortion, lower DC offset voltages, and higher thermal stability.
Ultra Low Feedback
The very simple gain path has been configured for very low amounts of feedback. This contributes to the warm and musical quality of the sound and the high stability of the amplifier with a wide variety of loads.
High Power Output Stage
The amplifier uses International Rectifier Hexfets exclusively in all gain stages. The output stage uses the highest Power Mosfet types available. The output stage of each channel is capable of withstanding transients of about 3 kilowatts.
High Current Output
Each channel uses 10 Power Mosfet output devices. These devices are each rated to handle 20 amps of output current. This output capacity is adequate to deliver full power into 2 ohm loads, and the amplifier is completely stable driving 1 ohm or less.
Low Impedance Performance
The amplifier does not produce significantly higher distortion readings into low impedance loads, unlike other amplifiers on the market. Watt for watt, the distortion into 2 ohms is only slightly higher than that into 8 ohms.
Near Class A Bias
Each channel of the amplifier is biased at about 50 watts idle current. This is a lot, and represents near-Class A operation for most listening levels, giving depth and ambiance to its sound. The distortion curve is monotonic, (distortion decreases with level) and is primarily 2nd harmonic at listening levels.
Thermal and Error Warning Indicators
Each channel has a LED to indicate over temperature or excessive distortion.
Modular Channel Construction
All of the active circuitry for each channel is on a single printed circuit board mounted on the heat sink. This assures short signal paths, accurate wiring placement, and allows for easier servicing. Outboard heatsinks provide the necessary air circulation to allow the output devices to operate within their specified temperature range.
Power Rating (To FTC
Requirements) IM Distortion (SMPTE)
IM Distortion (CCIF,
Any Combination from 4kHz to 20kHz) THD + Noise at 200
watts into 8 Ohms (Typical) THD + Noise at 350
watts into 4 Ohms (Typical) Frequency Response at
1 Watt Into 8 Ohms 10Hz to 20kHz.....+0, -0.25dB Power Bandwidth
(-3dB).....3hz to
130kHz Dynamic Headroom into
4 Ohms.....1.7dB Signal to Noise Ratio,
A Weighted 200 watts into 8
ohms.....> 100dB Gain.....29dB Input
impedance.....49.9k
ohms Damping Factor 20Hz to
20kHz.....> 700 Rise Time
5kHz, 120V peak-to-peak square wave, 20%
to 80%.....1.5uS Power Consumption
(Continuous, Both Channels Driven) Power (available in
230V by special order).....115VAC
50/60Hz Chassis Dimensions
7" (178mm) x 17" (432mm) x 13 3/4"
(349mm) Maximum Dimensions
7 1/4" (184mm) x 17" (432mm) x 14 3/4"
(375mm) Weight.....44
lbs. (20kg) Weight
Packed.....50 lbs.
(23kg)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
The GFA 5400 replaces the GFA 545II and offers many of the same design features and sonic attributes of the enthusiastically received GFA 5800 and GFA 5500. The specifications should adequately describe all the pertinent information, including the increased power output into 8 and 4 ohms over the GFA 545II. As the 4 ohm power indicates, the current capability of the GFA 5400 has been substantially increased. The improvements are clearly audible with virtually all loudspeaker systems and will be apprecaited by all who will use multiple 5400s in home thaeater systems.
With a 33% increase in power at 4 ohms, you might expect a substantial price increase. No way. In order to offer increased value, the suggested retail price will increase less than 10% (over the GFA 545II) to only $679.95.
|
|
|
Power Rating (To FTC Requirements)
IM Distortion (SMPTE) l watt to l25 watts into 8 ohms.....<0.05% 1 watt to 200 watts into 4 ohms.....<0.05% IM Distortion (CCIF, Any Combination from 4kHz to 20kHz)
THD + Noise at 125 watts into 8 ohms (Typical)
THD + Noise at 200 watts into 4 ohms (Typical)
Frequency Response at 1 watt into 8 ohms (10Hz to 20kHz).....+0, -0.25dB Power Bandwidth (-3dB).....3Hz to 130kHz Dynamic Headroom Into 4 ohms.....1.7dB Signal to Noise Ratio, "A" Weighted (125 watts into 8 ohms) .....> 100dB |
Gain.....29dB Input Impedance.....49.9K ohms Input Sensitivity
Damping Factor (20Hz to 20 kHz).....>500 Rise Time (5kHz, 90 V peak-to-peak square wave, 20% to 80%).....1.9 us Power Consumption (Continuous, Both Channels Driven)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Number of channels 2 Watts per channel into 8 ohms 80 Watts per channel into 4 ohms 125 Number of output devices 8 Type of outputs MOSFET Power transformer Toroid Storage capacitance 40,000uF Input Sensitivity for 1 watt output 0.1 volts Input Sensitivity for full output .9 volts Damping factor 20Hz - 20kHz >350 Rise Time 5kHz, 20%-80% 1.8us Dynamic headroom into 4 ohms 2.1dB IM Distortion (SMPTE)
IM Distortion (CCIF, Any Combination from 4kHz to 20kHz)
|
THD + Noise at full power into 8 ohms (Typical)
THD + Noise at full power into 4 ohms (Typical)
Frequency Response at 1 watt into 8 ohms (10Hz to 20kHz).....+0, -0.25dB Power Bandwidth (-3dB).....3Hz to 130kHz Gain.....29dB Input Impedance.....49.9K ohms Signal to Noise Ratio, "A" Weighted (full power into 8 ohms).....> 100dB Power Consumption (Continuous, Both Channels Driven)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Number of channels 2 Watts per channel into 8 ohms 50 Watts per channel into 4 ohms 80 Number of output devices 4 Type of outputs MOSFET Power transformer Toroid Storage capacitance 27,000uF Input Sensitivity for 1 watt output 0.1 volts Input Sensitivity for full output .71 volts Damping factor 20Hz - 20kHz >260 Rise Time 5kHz, 20%-80% 1.1us Dynamic headroom into 4 ohms 2.2dB IM Distortion (SMPTE)
IM Distortion (CCIF, Any Combination from 4kHz to 20kHz)
|
THD + Noise at full power into 8 ohms (Typical)
THD + Noise at full power into 4 ohms (Typical)
Frequency Response at 1 watt into 8 ohms (10Hz to 20kHz).....+0, -0.25dB Power Bandwidth (-3dB).....3Hz to 130kHz Gain.....29dB Input Impedance.....49.9K ohms Signal to Noise Ratio, "A" Weighted (full power into 8 ohms) .....> 98dB Power Consumption (Continuous, Both Channels Driven)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
The GFA-5006 is really several amplifiers in one. With the flexibility to be configured to drive from as many as six channels to a combination of five, four, or three channels, the GFA-5006 is ideal for use as a multi-zone amplifier that can provide quality amplification for a whole house, distributed sound system. With individual level controls for precise control of each amp's volume, it's the ideal foundation for an authentic, ultra-realistic surround sound theater system, or for a multi-room or multi-speaker audio system.
Custom installers love the flexibility and thoughtful features we've designed into the unit for custom sound applications. These features include 3 to 30 volt AC or DC triggering, signal sensing for each channel, a ground lift switch, pass through RCA input/output jacks for easy daisy chaining and heavy duty five-way binding posts for solid speaker connections. The GFA-5006 also has a rear mounted "vacation switch," sophisticated electronic and thermal protection circuits and internal fuses to eliminate worries about shorted speaker wires, unintentional misconnections, or other potential problems.
Controls on the GFA-5006's rear panel let you select multi-channel operation, or bridge the channels for a 3-channel configuration. In the 3-channel mode, the GFA-5006 brings your home theater to life, delivering 175 watts of clean, distortion-free sound to the center channel and each of the rear channels. Add it to your existing 2-channel amplifier and you'll be at the center of a superbly balanced, awesomely powered system with sound so real you can practically touch it.
For audio applications, the GFA-5006 in the 4-channel mode acts as two amps, one at 175 watts-per-channel x 2 and a second at 50 watts-per-channel x 2 to drive two sets of speakers. A great way to have sound in two separate rooms or areas of the home.
Five channels, four, or three, home theater or home audio, the award-winning ADCOM GFA-5006 gives you many times the versatility of ordinary amplifiers. And much more of the value that has made ADCOM famous.
|
|
|
Power Rating (To FTC Requirements)
IM Distortion (CCIF, Any Combination from 4kHz to 20kHz) 50 watts into 8 ohms .....< 0.01% 75 watts into 4 ohms ..... <0.01% Power Bandwidth (-3dB) .....5Hz to 130kHz Dynamic Headroom into 4 ohms .....1.8dB Signal-to-Noise Ratio, "A" weighted 100 watts into 8 ohms..... > 100dB Gain .....variable, 29dB maximum Input Impedance .....17,000 ohms Input Sensitivity
|
Input Sensitivity, Bridged, AMPLIFIER B, Only 175 watts into 8 ohms.....1.8V rms 1 watt into 8 ohms.....130mV rms GENERAL Power (available in 230V on special order)115 VAC/50-60Hz Chassis Dimensions 4.75"(121mm) x 17"(432mm) x 14.25"(363mm) Maximum Dimensions 5.25"(134mm) x 17"(432mm) x 15.5"(395mm) Weight .....33 lbs.(l5kg) Weight, packed.....38 lbs.(l6kg) |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
The GFA 2535 is really two GFA-535s in one, with the flexibility to drive three or four channels. With individual level controls for precise control of each amp's volume, it's the ideal foundation for an authentic, ultra-realistic surround sound theater system, or for a multi-room or multi-speaker audio system.
A single switch on the GFA-2535's rear panel lets you select 4-channel operation, or bridge two of the channels for a 3-channel configuration. In the 3-channel mode, the GFA-2535 brings your home theater to life, delivering 200 watts of clean, distortion-free sound to the center channel, and 60 watts to each of the rear channels. Add it to your existing 2-channel amplifier and you'll be at the center of a superbly balanced, awesomely powered stage with sound so real you can practically touch it.
For audio applications, the GFA-2535 in the 4-channel mode acts as a pair of 60 watts-per-channel amplifiers to drive two sets of speakers. With two of the channels bridged, it delivers 60 watts each to a pair of satellites, and 200 watts to a single subwoofer for an incredible display of musical strength so real you definitely can feel it.
Three channels or four, home theater or home audio, the award-winning Adcom GFA-2535 gives you twice the versatility of ordinary amplifiers. And twice the value that has made Adcom famous.
|
|
|
Power Rating (To FTC Requirements)
IM Distortion (CCIF, Any Combination from 4kHz to 20kHz) 60 watts into 8 ohms .....< 0.01% Power Bandwidth (-3dB) .....7Hz to 150kHz Dynamic Headroom into 4 ohms .....1.5dB Signal-to-Noise Ratio, A-weighted 60 watts into 8 ohms.....< 100dB Gain .....27dB Input Impedance .....22,000 ohms Input Sensitivity
|
Input Sensitivity, Bridged, AMPLIFIER B, Only
Damping Factor .....20Hz to 20kHz >400
|
|
E-mail: sales@admtechusa.com |