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Performance and Reliability.
Without the Window Dressing.
For more than three decades, designer/engineer Morris Kessler has created audio
products with a simple goal in mind: delivering maximum performance and reliability.
In his products, you will find no gratuitous features or needless ornamentation. But
everywhere you look, you will find design touches that improve sound quality and
increase dependability.
Beginning in the 1960s with SAE—one of the pioneers in high-quality solid-state
amplification—and extending into the new millennium with Amplifier Technologies, Inc.,
Kessler has always relied on proven designs. Most of his original products, some more
than three decades old, are still hard at work in consumers’ homes. Through the decades,
he has refined his circuits to near-perfection. And from the first day, he has operated his
own Southern California factory—unlike most audio companies, which subcontract their
vital manufacturing processes to anonymous offshore companies.
In the following pages, you will see what makes ATI today’s best value in home audio.
AT2000 with
rack mount
option shown
actual size
An Interview with Morris Kessler,
ATI Founder and Chief Engineer
ATI Manufacturing:
No Shortcuts, No Compromises
Is there an overall philosophy in the way you design and build products?
In all the products I’ve designed—even going back 30 years ago—the focus is on value and
performance. ATI products aren’t inexpensive, but you always get your money’s worth.
You’re not buying a boxful of air.
We assemble all ATI products in our 50,000-square-foot Southern California factory.
Everything is built 100 percent to our specifications, and we monitor every aspect of the
quality-control process ourselves. Here are some of the steps we take to make ATI products
the best value in the audio industry. All of these improvements pay off in dependability
and sound quality.
What’s filling all that space?
Big heat sinks, for one thing—we could save space by using fans, but that creates a lot of
noise. Big transformers, and separate power supplies for each channel. We also ground all
of our amplifiers at a single, central point, instead of grounding them in the transformer.
That improves the grounding and lowers noise, but it means we have to have extra rectifiers in
the power supply. As a result, we create a weight issue, too. Heat sinks and big transformers are
heavy, so you need an extremely sturdy chassis to support them. We could save some cost by,
for example, using cooling fans, but the end product wouldn’t be as good as I want it to be.
Toroidal Transformers
An amplifier starts with the power supply,
which starts with the transformer—the
source of an amplifier’s power. We wind all
of our own transformers in our own shop, to
assure the highest quality. The transformer
cores in our amplifiers are made from
MOH, with magnetic properties that make
the cores 18 percent more efficient than
standard transformer cores. Each amplifier
channel gets its own set of windings, which
minimizes interaction between channels.
We wind the cores two wires at a time, a
Bifilar transformer winding process
technique called “bifilar winding” that
ensures perfectly symmetrical
transformers that work more efficiently and produce less distortion. Our techniques and
materials combine to create the highest
quality power transformers in existence.
You seem to take your design cues from Henry Ford–all of your products come
in whatever color you want, as long as it’s black.
People should get what they pay for. Using a faceplate that costs as much as the rest of the
amp costs doesn’t make sense to me. An amp’s chassis should be sturdy and have a nice
design, and that’s it.
How do you assure that all of your
products achieve the quality
standards you set?
Well, we manufacture or assemble
everything right here in our own factory.
I do have an office in the factory, but my
real office is out on the production line.
I spend a lot of time there making sure
everything’s running right.
Each amplifier channel gets not only its
own set of transformer windings, but its
own rectifier and storage capacitors, thus
giving each channel its own separate
power supply. Even if the left channel is
pushed to the limit by, say, a loud car crash
on a movie soundtrack, it does not affect
the power that the other channels receive.
How has ATI evolved over the years?
I’ve been manufacturing amplifiers for
decades. Around ’93, I got interested in
We assure the quality behind the name computer-aided design [CAD], and built a
stereo amp just for fun. I got the bug again,
and brought the amp to the 1993 Consumer Electronics Show to see if we could drum up
any interest. I ended up getting requests to build amps for other companies, and we’ve
since built amps for at least a half-dozen companies whose names you would definitely
recognize. In between those jobs, we started building ATI amps. The first ATI amps were
very successful, and we’ve expanded the line greatly from there.
We house our products in rugged chassis,
Transformers produced in ATI factory
with powder-coated finishes that resist
scratches and prevent corrosion. Our
hardware is equally durable and rustproof, made from Teflon-coated, 18-8 stainless steel.
We use inserts instead of threading metal parts resulting in a stronger unitized chassis.
Heat Sinks
Because we design our amplifiers for the
home as well as the rigorous demands of
commercial applications, we use substantial
heat sinks for each channel. This results in
amplifiers that run absolutely quietly and
as coolly as possible. The result; there is no
noise to mar your listening experience and
your amplifier operates more efficiently
for a longer life. These over-size heat sinks
eliminate the need for fans that add noise
and introduce dust into the amplifier.
AT2000 circuit board with heat sink
Rear panel chassis-mount RCA jacks
Circuit Boards
We use double-sided FR-4 glass epoxy
circuit boards in all of our products. Not only does a double-sided board handle twice the
electrical current that a single-sided board does, it produces much more solid connections
to the components on the board. The solder joints that secure the components to the
board cover both surfaces of the board, plus the inside of the hole into which the
component leads are inserted. As a result, our circuit boards are practically perfect,
with nearly zero failures due to bad connections and cold solder joints.
Chassis-Mounted RCA Jacks
The gold-plated RCA input jacks on our
amplifiers are mounted directly to the rear
panel, instead of to a circuit board. While
this technique complicates assembly, it
results in a more robust connection, and
the jack cannot be accidentally broken off
by the tight-gripping RCA plugs used on
many audiophile interconnect cables.
In addition, our AT2000 and AT3000 Series
power amplifiers use XLR-type connectors
to make connections with the balanced
audio output from a preamplifier such as
our ATP8500.1 with balanced audio outputs.
Trouble-Free Circuit Breakers
Our higher power multi-channel amplifiers use magnetic circuit breakers to protect against
AC overloads. If the breaker trips, it’s a simple matter to reset it. Most amplifiers, however,
use fuses for overload protection; if a fuse blows, you must have the proper one available
to restore power to your amplifier.
Protection Circuits
ATI amplifiers employ lightning-fast optically-coupled protection circuits that are
completely removed from the signal path so they cannot affect the sound quality. These
protection circuits are designed to detect electrical “shorts” in speakers or speaker wires
and to sense electrical
“spikes.” If triggered, the
circuit will disengage the
output. The protection circuit
will sample the affected
circuit every 10 seconds
and will restore output
automatically when safe to
do so. This special feature
minimizes the chance of
your amplifier going out of
service just when you’ve
filled your home theater
with expectant guests.
Amplifiers on the assembly line
The components we use on our circuit boards also add to the quality of ATI products. All
of the gain stages in our products employ high-quality metal-film resistors with 1-percent
tolerances, to ensure that each and every circuit board functions exactly like the last.
Open most multichannel power
amplifiers and you will see a “rat’s
nest”—dozens of wires running
haphazardly through the chassis.
Open up an ATI amplifier, though,
and you will see a clean layout,
with wires wrapped neatly in a
fiberglass cloth tubing originally
developed for the aerospace
industry. The tubing protects the
wire from both heat and
accidental damage.
Fiberglass cloth tubing protects wires
Pure Balance® Amplifiers:
AT3000 and AT2000 Series
Single-ended amplifier
“Pure Balance” amplifier
Engineers, reviewers, and home theater enthusiasts
may often disagree, but when it comes to amplifiers,
there is one fact on which they all find common
ground: The best possible design is the fully
differential balanced amplifier.
A fully differential amplifier is basically two separate
amplification circuits per channel. One circuit
amplifies the positive half of the audio signal, while
the other amplifies the negative half. The benefits of
this design are tremendous. It automatically rejects any
noise coming in from external sources, such as
radio-frequency and electromagnetic interference. It
eliminates hum and reduces distortion. It also doubles the
slew rate (speed) of the amplifier, for better reproduction of
high frequencies, and better transient performance.
We call this technology Pure Balance®, and we use it in two of our amplifier lines:
the AT3000 series and the AT2000 series. The result of Pure Balance technology is
breathtaking. Acoustic instruments sound so natural and clear, you may think you’re
hearing a live performance. The rich ambience of concert halls envelops you as never before.
A revealing look inside the
AT3007 7-channel power amplifier
showing off the massive transformers,
huge heat sinks, double-sided glass epoxy
circuit boards and extraordinarily solid chassis
Although some home theater amplifiers have balanced, XLR-type input
connectors, most simply convert the balanced signal to unbalanced in the first
amplification stage—and limit the benefits of a balanced connection in the
process. Not Pure Balance amplifiers. Pure Balance amplifiers keep the signal
balanced all the way from the XLR inputs to the speaker terminals.
With substantial power on tap—300 watts per channel for the AT3000 series,
200 watts per channel for the AT2000 series—both amplifiers have the muscle
to power the largest home theater systems. The AT3000 series, in particular,
produces enough power even for capacious screening rooms. Both amplifiers
are available in any two to seven channel models from the AT2002/AT3002
to the AT2007/AT3007. Because each amplifier channel resides on a separate,
plug-in module, upgrades are easy. You can start with, say, five channels and
add two more if you decide to move up to Dolby Digital EX®, DTS ES-Discrete®,
or other 6.1- and 7.1-channel surround-sound technologies.
AT2000 Series
power amplifier
Most amplifiers this large use loud cooling fans; the AT3000 and AT2000 series instead use
large heat sinks, so you can place them anywhere in a room without having to worry
about noise. Large amplifiers have a tendency to trip household circuit breakers, due to
the tremendous inrush of current necessary to charge up their power supplies. This
problem simply does not exist with the AT3000 and AT2000 series amps, because both feature
ATI’s Ultra Soft Turn-On circuit. This circuit progressively powers up the amplifier gradually,
so the current inrush is minimal. Even with the seven-channel AT3007, which produces
2,100 watts of power, you will not see your lights dim when you power up the amplifier.
situation without the use of relays. If an overload occurs, the circuit monitors the
conditions every 10 seconds, and restores output automatically once the overload situation
is removed. This protection circuit is optically coupled to the audio circuit, with no direct
electrical connection. Thus, it cannot affect sound quality. In the equally unlikely event
that the amplifier’s magnetic circuit breaker shuts down, resetting it is as simple as
flipping a switch. There is no down-time for fuse replacements or costly service calls.
Although it is extremely unlikely one could push these amplifiers past their limits, there
is always the possibility of accidentally damaging a speaker cable and shorting out the
amplifier. With the AT3000 and AT2000 series power amplifiers, you needn’t be concerned.
Both include a protection circuit that automatically disengages the output in an overload
We supply the AT3000 series with a power cord that fits only into a 20-amp electrical socket.
This amplifier is so powerful it cannot reach peak output from a 15-amp circuit. The power
cord is designed specifically for 20-amp use, providing a more robust connection to the
amplifier than a 15-amp cord can offer. The AT2000 series uses the same 20-amp connection
at the amplifier end, but substitutes a 15-amp plug.
The huge transformers used in these amplifiers employ
MOH cores with bifilar windings, manufactured by us in
our own factory. Of course, both amps also use double-sided
glass epoxy circuit boards, and an extraordinarily solid,
massive chassis built to support the heavy heat sinks and
transformers required in amps this large.
AT3000 Series
2 to 7 Channels
300 Watts/Ch
(8 Ohms)
450 Watts/Ch
(4 Ohms)
A trigger feature lets these amps interface with control
systems, so they can be turned on and off automatically,
or from a remote control.
AT2000 Series
2 to 7 Channels
200 Watts/Ch
(8 Ohms)
300 Watts/Ch
(4 Ohms)
Listen to the AT3000 and AT2000 series amps.
We think you’ll agree that no other fully differential
amplifiers in the world can beat their performance
and power—or their price.
Back panel of the AT2007 (the AT3007 has the same layout but is taller)
Son of the Standard:
The AT1800 Series
We built much of our reputation on the AT1505 amplifier, which won
acclaim in such magazines as Home Theater, Audio, and Stereophile
Guide to Home Theater as one of the best values in a multichannel amp.
Our AT1800-series amplifiers are a direct outgrowth of the AT1505, with the
same audiophile-grade sound, but with 20 percent more power and many
new features designed to further enhance the amp’s performance.
The AT1800 series comprises six amplifier models, all identical except for the
number of channels. The series starts with the two-channel AT1802, and finishes with the
seven-channel AT1807. The amplifiers are modular; each channel resides on a separate,
plug-in circuit board, so increasing the number of channels is easy. You can go from a
five-channel AT1805 to a seven-channel AT1807 in a matter of minutes.
AT1800 series
power amplifier
The AT1800-series amps use the same transformer
construction as the top-of-the-line AT3000
and AT2000 series amps: MOH cores with
bifilar windings, built in our own factory.
It also uses double-sided glass epoxy
circuit boards, and the same rugged,
powder-coated chassis used in
all our products.
Like all other ATI amplifiers, the AT1800-series amps are cooled by large heat sinks, not by
cooling fans. This feature may be especially important in this amplifier, which is likely to
find use in many home theater systems that do not hide the equipment in a rack or closet.
You can set this amp right next to your favorite listening chair without having to worry
about fan noise. One significant improvement over the AT1505 is the protection circuit
used in the AT1800 series. This circuit automatically shuts down the amplifier in an
overload situation, such as when someone accidentally cuts into a speaker cable and
shorts out the amp. Once the protection circuit is engaged, it checks the conditions every
10 seconds, and restores output automatically when the overload situation is remedied.
The protection circuit is optically coupled to the audio circuit; because there’s no direct
electrical connection, the protection doesn’t affect sound quality. A magnetic circuit
breaker provides further protection and eliminates the need for cumbersome fuses.
Even the AT1807,
with 1,260 total
watts, will not trip
your household
circuit breaker or dim
the lights when you switch
it on. High power amps draw
a momentary—but tremendous—
inrush of electrical current when you
turn them on. The AT1800-series amps do
not, thanks to ATI’s Ultra Soft Turn-On circuit.
This circuit gradually powers up the amp, to ease
the load on your household circuits. And the amp
includes a trigger input that allows it to be turned on
and off automatically, or by remote control.
For the best value in a basic home theater amplifier,
nothing beats ATI’s AT1800-series amps.
Back panel of the AT1807
An inside look at the
AT1807 7-channel
power amplifier
AT1800 Series
2 to 7 Channels
180 Watts/Ch
(8 Ohms)
270 Watts/Ch
(4 Ohms)
Two-Channel Amplifiers
For More Than Just Stereo
Two-channel amplifiers aren’t just for stereo anymore. They’re just as likely
to find use powering the two back speakers in a 7.1-channel surround
sound system, or driving six ceiling speakers in a master bedroom suite. Nowadays,
a two-channel amplifier must produce the sound quality demanded by audiophiles,
handle the extreme dynamics of home theater, and provide the reliability
expected by custom installers. Few two-channel amps are designed to handle
each of these tasks—but for the ATI AT1202 and AT602, it’s all in a day’s work.
power amplifier
The AT1202 and AT602 are two-channel amplifiers
(120 watts and 60 watts per channel, respectively)
with all of the quality features built into ATI’s big
multichannel amplifiers, including ATI-built
transformers with MOH cores and bifilar windings, double-sided
circuit boards, and massive heat sinks for quiet, reliable cooling.
Without clip limiter Both sound excellent in stereo applications. But both also include
features designed to enhance their utility in custom-installed
audio/video systems.
With Clip Limiter
At Same Level
power amplifier
It is not always practical to have a
separate amplifier driving each speaker in a multiroom audio system; installers often use
a single amp to drive multiple speakers. This arrangement presents a tremendous load
that many amplifiers cannot drive, which is why we designed the AT1202 and AT602
specifically so that they can drive a few pairs of speakers without strain. Their output
stages remain stable and functioning even with the complex, challenging loads that multiple
speakers usually present. When these amps encounter an overload situation, they conduct
themselves with grace. An optically coupled protection circuit disengages the amp’s output
when it encounters an overload. The circuit checks the conditions every 10 seconds, and
restores output automatically when the overload is corrected; without the use of relays.
The AT1202 and AT602 include clip limiters, which prevent the
amplifiers from producing significant clipping (distortion), no
matter how high the volume is turned up. Distortion can destroy
speakers and in-wall volume controls in seconds, but with the
AT1202 and AT602, it is never a concern.
Both amplifiers include a remote trigger feature, which is
rare on stereo amps. The remote trigger allows other
devices, such as surround-sound preamp/processors and
multiroom audio controllers, to turn the AT1202 and AT602
on and off automatically.
You can stack 10 of these amps for a multiroom audio
system without having to worry about tripping the house
circuit breaker when they’re turned on. ATI’s Ultra Soft
Turn-On circuit gradually powers up the amplifiers to
reduce the current load. You won’t even see the lights dim!
Whether you’re powering a pair of exotic audiophile
speakers, or stringing together a yardful of outdoor
speakers, the AT1202 and AT602 are up to the task.
Back panels of the AT1202 & AT602
2 Channels
120 Watts/Ch
(8 Ohms)
180 Watts/Ch
(4 Ohms)
2 Channels
60 Watts/Ch
(8 Ohms)
90 Watts/Ch
(4 Ohms)
Stereo in Six Rooms—
From One Amplifier
Sound anywhere in your home, at the touch of a button. It’s always been the
dream of the music lover. The AT6012 makes it a reality. And unlike any other
amplifier, the AT6012 is designed to provide up to six rooms of sound with no
additional multiroom audio electronics required.
The AT6012 includes connectors for external “up/down” momentary rocker
switches, such as the Leviton® 5657-2E pictured; these switches give you
up/down volume control. Simple, three-wire Phoenix connectors give you
stereo volume control in any room at exceptionally low cost. Because we use high-quality,
motorized gain controls instead of inexpensive potentiometers, the AT6012 delivers sound
quality far superior to that of typical wall-mounted volume controls. Add six up/down
switches, a CD player and speakers, and you have a complete multiroom audio system
with performance equal to or better than that of any multiroom system on the market.
power amplifier
Closeup view of
Phoenix connectors
A rocker switch controls
volume in each room
When we designed the AT6012, we
did not sacrifice functionality just
to accommodate more channels. So
we included all of the features that
make ATI amps sound great and
function dependably. The AT6012
uses transformers made from MOH
cores with bifilar windings, doublesided glass epoxy circuit boards,
and separate supply capacitors and
power supply rectifiers for each of
its 12 channels. Thanks to separate
power supplies for each channel,
you can crank up the sound for a
party without diminishing sound
quality in the other rooms.
With 60 watts per channel, and the same amplification circuits found in ATI’s
award-winning home theater amplifiers, the AT6012 packs enough power to drive nearly
any speaker, and the sound quality to please even the most demanding professionals.
A multiroom amplifier must be especially reliable—it sees use practically every day, and
is likely to be installed in an equipment rack that may make it difficult to service. The
AT6012, like other ATI amps, is designed and built with a focus on reliability. Its optically
coupled protection circuit disengages the output whenever an overload condition
(shorted speaker terminals, for example) exists. It then checks the conditions every
10 seconds, restoring output only when the overload condition has been removed;
without the use of relays.
A remote trigger allows such devices as multiroom audio
controllers, touchscreen remote controls or a simple wall
switch to turn the AT6012 on and off automatically.
With the dependability and sound quality of the
AT6012, there’s no reason to sacrifice performance
for multiroom audio systems. Each and every room
can enjoy the same sound quality you’d experience
in a ATI-equipped home theater.
Back panel of the AT6012
12 Channels
60 Watts/Ch
(8 Ohms)
90 Watts/Ch
(4 Ohms)
Power Amplifier
Model or Series
2 to 7
2 to 7
2 to 7
EIA 1kHz Output Power at 8 Ohms*
350 watts
250 watts
210 watts
140 watts
75 watts
75 watts
EIA 1kHz Output Power at 4 Ohms*
475 watts
375 watts
315 watts
220 watts
110 watts
120 watts
FTC Full Bandwidth Output Power at 8 Ohms**
300 watts
200 watts
180 watts
120 watts
60 watts
60 watts
FTC Full Bandwidth Output Power at 4 Ohms**
450 watts
300 watts
270 watts
180 watts
90 watts
90 watts
Input Sensitivity for Full Rated Power
1.8 Volts
1.6 Volts
1.6 Volts
1.3 Volts
0.9 Volts
1.2 Volts
Number of Channels
Frequency Response
±0.1dB from 20Hz to 20kHz at 1 watt
Phase Response
+5 to -15 degrees from 20Hz to 20kHz at 1 watt
Signal-to-Noise Ratio “A-Weighted”
Greater than 120dB below rated FTC full bandwidth power
Total Harmonic Distortion (THD)
Less than 0.03% at full rated FTC power from 20Hz to 20kHz
Intermodulation Distortion (IMD)
Less than 0.005% at full EIA power at 1kHz
Less than 0.03% from 250 milliwatts to full rated FTC power
Load Impedance
Safe with all types of loads. Rated for 4 to 16 ohms
Power Bandwidth FTC
+0-3db from 5Hz to 100kHz
Damping Factor
Greater than 400 from 10Hz to 400Hz
Greater than -100dB from 20Hz to 20kHz
Voltage Gain Through RCA Jacks
Voltage Gain Balanced Through XLR Jacks
17 x 3.5 x 10.25
17 x 7 x 16
Slew Rate
Input Impedance
Nominally 28k ohms
DC Output Offset
Less than ±5mV
Power Requirements
Chassis Dimensions (W x H x D) Inches
Chassis Dimensions (W x H x D) Millimeters
Net Weight (lbs/kg) Model Dependent
Shipping Weight (lbs/kg) Model Dependent
120 VAC (other voltages available on export models)
17 x 8.75 x 18.3
431.8 x 222.2 x 464.8
17 x 7 x 16.5
17 x 7 x 16.5
17 x 3.5 x 12
431.8 x 177.8 x 419.1 431.8 x 177.8 x 419.1 431.8 x 88.9 x 304.8 431.8 x 88.9 x 260.4 431.8 x 177.8 x 406.4
44 /20
48 /21.82
*EIA 1kHz Power refers to maximum average power in watts at 1kHz with 0.005% THD and noise. **FTC Full Bandwidth Power refers to maximum average power in watts from 20Hz to 20kHz with 0.03% THD and noise.
The Heart of State-of-the-Art
Home Theater Systems
RS232 interface, or through interchangeable EPROM memory chips. (A more basic model,
the ATP8500, is also available; it features Dolby Digital, Pro Logic, and DTS, and omits
Dolby Digital EX, Pro Logic II, and DTS-ES-Discrete. However, it can be upgraded with these
technologies at any time.)
A truly state-of-the-art home theater system places extreme demands on a surround-sound
preamp/processor. With new surround-sound technologies emerging almost monthly,
a processor must offer all of the various flavors of Dolby and DTS, and be able to upgrade
as new technologies emerge. It must provide every type of audio and video connection in
common use, and be able to accommodate more as they are introduced. It must produce
the sound quality of audiophile-grade digital components, and the convenience features
demanded by custom installers.
Any existing audio/video source—an HDTV satellite receiver, a progressive-scan DVD
player, a DVD-Audio and/or SACD player—connects easily to the ATP8500.1. It even has
an AES/EBU digital connection for use with high-end CD and DVD transports. Balanced
XLR-type outputs for every channel make it ideal for use with ATI’s AT3000 and AT2000
Series Pure Balance® amplifiers. And no matter what new video or audio devices emerge,
the ATP8500.1 can be upgraded to accommodate them. We left ample space inside the chassis
and included a removable panel on the rear, so that new circuit boards and jacks can be
added in the future. No matter what video or audio equipment you own (or dream of owning),
the ATP8500.1 can accommodate it.
In short, it must match the prodigious capabilities found
in ATI’s top-of-the-line preamp/processor, the ATP8500.1.
While the ATP8500.1 offers all of the surround-sound technologies that high-end home
theaters demand—Dolby Digital EX® and Pro Logic II®, and DTS ES-Discrete®—it can also be
upgraded as new technologies are developed, either from a computer via the ATP8500.1’s
Back panel of the ATP8500.1 includes inputs for virtually any source
Custom installers will love
the ATP8500.1’s control
features. These include an
RS-232 jack that allows
easy interfacing with
control systems such as
Crestron® and AMX®
touchscreen remotes, and
a second-zone output that
lets you listen to or watch
any audio or video source
in another room. Three
remote trigger outputs
can be programmed to
function only when
specific inputs are selected,
so you can trigger, say, a
motorized screen to drop
automatically when the
DVD input is selected.
The programmable, backlit
remote controls not only
the ATP8500.1, but every
other device in your
audio/video system, too.
By now, you must have noticed the ATP8500.1’s most distinctive feature—its large,
front-panel video monitor. Not only does the monitor let you see images from composite
and S-video sources, it also lets you use the ATP8500.1’s onscreen setup menus even if you
cannot see your TV. This screen proves especially convenient in custom installations
where the ATP8500.1 is mounted in a separate equipment closet or room.
Finally, the ATP8500.1 offers enough inputs for even the most
complex home theater systems. They include six composite
video inputs, six S-video inputs, three high-definition
component video inputs, ten analog and seven digital audio
inputs, and balanced XLR-type stereo analog audio inputs.
The ATP8500.1 offers outstanding build quality, with double-sided glass-epoxy circuit
boards for more reliable solder connections, a powder-coated chassis with 18-8 stainless
steel hardware, and rugged, chassis-mounted RCA and XLR main output jacks.
No matter how complex your home theater system, or what you plan to add to it
in the future, the ATP8500.1 will meet your needs. Acquire whatever sources you
desire. We’ll accommodate.
Display setup
Dolby/DTS setup
Preset setup
Composite 1
Example of the Main menu
-------------------- -3dB
-------------------- 2dB
LFE level
TV system
Temporary disp.
Video format
Distance units
OSD style
Size setup
Example of the Audio Setup menu
Example of the Display Setup menu
Audio setup
Dolby D 3/2.1
Coaxial 1
Main speakers
Center speaker
Surround speakers
Back speakers
2 Small
Subwoofer filter
Subwoofer frequency
80 Hz
Enhanced bass
Example of the Size Setup menu
Modern Technology, Advanced
Features & Classic Reliability
When we started building surround-sound preamp/processors, we demanded
more than advanced features and up-to-the-minute technology. We wanted our
surround-sound preamp/processors to be every bit as durable and reliable as
our power amplifiers. And they are.
Case in point: the ATP7500.
Despite its modest price, the ATP7500 is built like a tank. We selected the
ATP7500’s premium components for their performance and reliability, and used
double-sided glass-epoxy circuit boards to ensure that those parts remain firmly soldered
in place. We package all this in a durable steel chassis with stainless-steel hardware and a
tough powder-coated finish. The end result is a processor that’s as technologically
advanced as a brand-new luxury sedan, but as rugged and reliable as a classic pickup truck.
Custom installers and advanced do-it-yourselfers will appreciate the ATP7500’s many
convenience features. We start with a learning remote that can control every component
in your system. An RS-232 interface makes it easy to control the ATP7500 from advanced
touchscreen controllers such as Crestron® and AMX®. A second-zone output permits the
use of any video or audio source device in another room. Remote triggers let the ATP7500
control motorized screens, lighting, etc. Discrete on and off buttons make it easy to control
the ATP7500 from a programmable remote. Buffered video outputs allow the ATP7500 to
feed distant TVs through long video cables. And all
of the ATP7500’s setup parameters can be
downloaded to a computer, making it
easy for a home user to restore the
settings, and for a custom installer
to program multiple ATP7500s.
The ATP7500 offers surround-sound technologies to suit any program material, from VHS
tape to multichannel SACD. It includes Dolby Digital EX® and Pro Logic II®, DTS ES-Discrete®
and 7.1-channel inputs that accommodate DVD-Audio and SACD players. The 7.1-channel
input includes bass management functions, so you can adjust the output of your DVD-A or
SACD player to suit your speaker system. Many processors with DVD-A/SACD inputs lack
this feature—and as a result, often discard much of the bass in the recordings.
The back panel includes six composite
video and six S-video inputs; two
high-definition component video
inputs, plus eight analog and six
digital audio inputs. There’s also an
AM/FM stereo tuner, a feature found
in few high-end preamp/processors.
You can be forgiven for thinking
that modern technology and
old-fashioned reliability are
mutually exclusive...but the
ATP7500 proves that they can
co-exist in the same product.
Back panel of the ATP7500
Why Should You Settle
For a Just a Receiver?
Value-minded home theater enthusiasts usually purchase audio/video receivers
to serve as the centerpiece of their systems. In the process, they sacrifice flexibility,
sound quality, and the ability to upgrade in the future. But with the ATP6500,
there’s no need to settle for a receiver. Combine this advanced-yet-affordable
surround-sound preamp/processor with our outstanding AT1807 amp, and you’ll
have a stack that handily outperforms high-end a comparable price.
Like the best receivers, the ATP6500 includes every important surround-sound technology:
Dolby Digital EX® and Pro Logic II®, DTS ES-Discrete® and 24/96, and a 5.1-channel input
for DVD-Audio and multichannel SACD players. The DVD-A/SACD input even has bass
management, with a fixed 80 Hz crossover, so you can adapt the sound from the DVD-A/SACD
player to your speaker system and avoid losing bass as you would with many surround
processors. The ATP6500 does not digitize the signals coming into the DVD-A/SACD input,
either, so every bit of the amazing sound quality of these new formats comes through.
Even dedicated home theater enthusiasts should find enough inputs and outputs on the
ATP6500’s back panel. It has five composite video, five S-video inputs, two high-definition
component video inputs, six digital audio inputs, and nine analog audio inputs.
Speaking of bass management, the ATP6500 offers a Triple Crossover feature, which
enables you to set different bass management parameters for the main (left/right),
center, and surround speakers. Now you can fine-tune your home theater audio system to
absolute perfection, giving each speaker exactly as much bass as it was designed to handle.
It comes with custom-installation-friendly convenience features, too. Its learning remote
control can command not only the ATP6500, but every other device in your system, too.
A second-zone output lets you enjoy any audio source in a second room. Trigger outputs
let the ATP6500 control a motorized screen,
room lighting, etc. The backlit remote
can be programmed to control all
of the other devices in your
audio/video system. There’s even
an AM/FM tuner.
Even at the ATP6500’s incredibly
affordable price, it still comes with
a durable, powder-coated chassis,
18-8 stainless-steel hardware,
detachable power cord, and doublesided glass-epoxy circuit boards.
With the ATP6500 preamp/
processor, even budget-minded
home theater enthusiasts need
not compromise when it comes
to sound. So kiss that receiver
goodbye and say hello to
state-of-the-art performance.
Back panel of the ATP6500
All Specifications refer to 1 Vrms and 0 dBf digital or 2 Vrms analog input, except when stated.
8 Vrms
3.5 Vrms
1.5 Vrms
15 k Ohms
15 k Ohms
26 k Ohms
Total Harmonic Distortion (Stereo Source)
Total Harmonic Distortion (7.1 Channel Source)
20Hz to 20kHz (±0.3 dB)
20Hz to 20kHz (±0.3 dB)
20Hz to 20kHz (±0.3 dB)
2 Vrms
2 Vrms
2 Vrms
Digital Audio Inputs/Outputs
4 Coax, 2 Optical, 1 AES-EBU/1 Optical
4 Coax, 2 Optical/1 Optical
2 Coax, 4 Optical/1 Coax, 1 Optical
Analog Audio Inputs/Outputs
2 Balanced, 11 RCA Pairs/3 RCA Pairs
8 RCA Pairs/2 RCA Pairs
9 RCA Pairs/2 RCA Pairs
1Set RCA/1 Set Balanced, 1 Set RCA
1 Set RCA1/Set RCA
1 Set RCA (5.1-Ch)/1 Set RCA
Input Level
Output Level (Preamp)
Input Impedance
Frequency Response (Stereo Bypass Mode)
Stereo Analog Input Level
Signal-to-Noise Ratio
7.1-Channel Audio Inputs/Outputs
Video Inputs (Composite, S-Video, Component)
6, 6, 3
5, 7, 2
5, 5, 2
Video Outputs (Composite, S-Video, Component)
3, 2, 1
4, 3, 1
2, 2, 1
1 Audio Out with Video
1 Audio In/1 Variable & 1 Fixed Audio Out
1 Audio Output
3 Remote, 2 IR
1 Main Zone, 1 Zone 2, 1 12V, 1 IR
DC Main/Z2, Ext Remote Main/Z2
100 VAC to 240 VAC
100 VAC to 240 VAC
100 VAC to 240 VAC
17 x 7 x 15.5
17 x 5.75 x 12.5
17 x 4.5 x 14.75
431.8 x 177.8 x 393.7
431.8 x 146.1 x 317.5
431.8 x 114.3 x 374.7
Net Weight (lbs/kg)
Shipping Weight (lbs/kg)
Second Zone Inputs and Outputs
AM/FM Tuner
Voltage Automatic Setting
Chassis Dimensions (W x H x D) Inches
Chassis Dimensions (W x H x D) Millimeters
Amplifier Technologies, Inc.
In the USA call 888-777-8507 Fax 818-343-7444
In Canada call Artech Electronics Ltd. 514-631-6448
All descriptions and specifications are subject to change without notice.
Crestron is a registered trademark of Crestron Electronics, Inc. AMX is a registered trademark of AMX Corporation.
Dolby Digital is a registered trademark of Dolby Laboratories Licensing Corporation. Dolby”, the Double-D symbol,
“Dolby Digital” and “Pro Logic” are trademarks of Dolby Laboratories Licensing Corporation.
“DTS” and “DTS Digital Surround” are registered trademarks of Digital Theatre Systems, Inc.
© 2003 Amplifier Technologies, Inc.
ATI products are warranted
against defects in materials
and workmanship for 90
days from the date of
purchase to the original
owner. An OPTIONAL
WARRANTY is available to
those customers who
purchase their product
only from an authorized
ATI dealer and registers it
properly within the
required time period.
The extended warranty is
transferable. We strongly
urge you to consult with us
to determine if the dealer
from whom you wish to
purchase your unit has
been officially authorized
so we can guarantee the
best possible service.
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