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Thread: Amplifier Technologies Inc. - ATI Amplifiers (Dealer Installs, News & Reviews)

  1. #1
    Join Date: Sep 2012

    Location: London

    Posts: 86
    I'm Manny.

    Default Amplifier Technologies Inc. - ATI Amplifiers (Dealer Installs, News & Reviews)

    Company Profile

    In the 40-plus years Morris Kessler, ATI’s president and chief designer, has been building amplifiers he has reached near-legendary status. Not only has he built a half-million amplifiers for his own and other, often better-known companies, he also designed and manufactured the worlds first high-performance 5-channel, 7 channel and 16 channel amps. To say he’s good at amplifiers would be a masterpiece of understatement.

    American Muscle

    At ATI we make heavy-duty amplifiers with proven circuitry, meticulous assembly and rigorous testing designed to deliver state-of-the-art audio for years-- all designed by us and built in our own US factory. It's a simple story, "American Muscle built by American muscle."

    No Shortcuts, No Compromises

    We design, engineer, and assemble all ATI products in our 50,000 square foot Southern California factory. Everything is built completely to our specifications and we monitor every aspect of the process ourselves. We're convinced, that our efforts pay off in dependability and sound quality. Our customers agree.

    Here's the Beef - Toroidal Transformers

    At the heart of any amplifier is the power supply. Its foundation is the power transformer. To assure the highest quality, we wind our own. For the transformer's core we use MOH with magnetic properties that increase efficiency 18% over conventional units. We wind the core two wires at a time, a technique called "bifilar winding" that ensures perfectly symmetrical transformers that maximize efficiency and reduce distortion 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 available to the other channels.


    We house our products in rugged chassis 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 are absolutely quiet and run as cool as possible. The result: there is no noise to mar the listening experience and the amplifier operates more efficiently for a longer life. Those over-size heat sinks eliminate the need for fans that add noise and introduce dust into the amplifier.

    Circuit Boards

    We use double-sided FR-4 glass epoxy circuit boards in all our products. Not only does a double-sided board handle twice the electrical current of a single-sided board, it produces much more solid connections to the components on the board. The solder joints that secure the components to the board over 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 or cold-solder joints.

    The components we use on our circuit boards also add to the quality of ATI products. To insure that each and every circuit board functions exactly like the last, all of the gain stages in our products employ high-quality metal-film resistors with 1-percent tolerance.


    Open most multichannel power amplifiers and you will see a "rat's nest"-dozens of wires running seemingly haphazard through the chassis. Open an ATI amplifier, though, and you will see a clean layout with wires wrapped neatly in fiberglass cloth tubing originally developed for the aerospace industry. The tubing protects the wire from both heat and accidental damage.

    Chassis-Mounted RCA Jacks

    The gold-plated RCA input jacks on our amplifiers are mounted directly to the rear panel and not to the 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 in some audiophile interconnection cables.

    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 re-set it. Most amplifiers, however, use fuses for overload protection: if a fuse blows, you must have the proper value available in order to restore power to the amplifier.

    Protection Circuits

    ATI amplifier 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 sense electrical "shorts" in speakers or wiring and sense electrical "spikes". If triggered, the circuit instantaneously disengages the output, samples the affected circuitry every 10 seconds and automatically restores proper operation when the fault is corrected. This special feature minimizes the chance of your amplifier going out of service just when you've filled your home theater with expectant guests.


  2. #2
    Join Date: Sep 2012

    Location: London

    Posts: 86
    I'm Manny.


    Another awesome review of the ATI Amplifier Technologies, Inc. AT52Xnc Class D power amplifier by TheaterByte. The AT52Xnc Class D power amplifier is available in 2 to 8 channel configurations.

    "Hearing is Believing"

    "The dynamic demands placed when heard at life-like levels often push lesser amplifiers into clipping: here, no problem whatsoever."

    "I was simply unprepared for how well this passage was conveyed via the AT524NC with headroom to spare"

    Read the full review:



  3. #3
    Join Date: Sep 2012

    Location: London

    Posts: 86
    I'm Manny.


    A review of the ATI Amplifier Technologies Inc AT6002 Signature Reference Series power amplifier by Secrets of Home Theater and High Fidelity Magazine.

    “The ATI AT6002 is completely fitting of its Signature Series designation. It is a giant in the world of power amplifiers, and I have never been so happy to have rack handles on something as I was with this. It handled all the music I could throw at it, and with its engineering pedigree and construction, I was certain it wasn’t going to break down under the stress. What surprised me is how silent it was when it was at idle.”


    ATI Signature Series are fully balanced, differential amps, advanced from previous designs which were essentially balanced bridged amplifiers. Signature Series uses only a single input stage with dual-differential output stages. This design approach retains the advantages of balanced designs and reduces noise by 50%. Using current feedback rather than voltage feedback, Signature Series amps respond faster with a virtually unlimited slew rate which makes them capable to reproduce todays best music and film sound. ThermalTrak™ output devices are incorporated in Signature Series amps to provide an integrated device for temperature sensing with the output transistor resulting in real-time bias performance. Combining these advancements with dual DC servos reduces DC offset at the output to insignificant levels.

    The use of a modular PCB layout with amplifier and power supply parts on the same card with edge to edge isolation of AC and signal input provides improved signal-to-noise ratio. Dual toroidal transformers, dual power switches and dual AC power cords bring a complete dual-mono design to the AT6002 and AT4002. Multi-channel amplifiers up to the 7-channel AT6007 and AT4007 models may be connected to independent 20 amp circuits for greater sustained output power than would be possible than from a single AC circuit.

    6000 Series amps are rated at 300 Watts RMS from 20Hz to 20kHz with no more than 0.03% THD at 8 ohms with all channels driven and 450 Watts RMS at 4 ohms under the same conditions. Signal-to-noise ratio is typically -128dB referenced to full output so that each Signature Series amp is capable of playing back the full dynamic range available on today’s lossless recordings.

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