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Two Channel

PS Audio

One of the new products introduced by PS Audio at CES 2002 was their new hybrid power amplifier, the HCA-1. This amp is a two-channel model based on an hybrid analogue/digital design and is rated at 150 watts per channel into an 8 ohm load and 300 watts per channel into 4 ohms. The input stage (which is also used in the Reference Tower and Classic 250 amps) is a new PS Audio design - a fully balanced/differential class A JFET stage with zero feedback, low distortion and is balanced from input to output.

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Common mode characteristics are claimed to top 70 dB in balanced mode. The output stage is a 93-percent efficient SDAT circuit developed by PS Audio. The SDAT output stage uses a modular Pulse Width Modulated design that is "super linearized" as a gain block.

Super linearization (a patented technique) is achieved by incorporating the output filtering stage of the SDAT in the audio feedback loop. PS Audio had a small demo of the amp set up using a Krell CD player and two-channel preamp (and a PS Audio P600 power plant on the bottom in this photograph) and from my brief listen it sounded very clean. The HCA-1 will be available in February with an MSRP of $1,495.

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PS Audio's new Classic 250 power amplifier. As noted above, it has the same input stage as the HCA-1. It is a dual mono design - the output stage is a true-analogue closed loop device with unity gain, and zero interaction with the input stage. Each mono side has its own 700vA power supply. Click for a Larger Image

As you can see it sports single-ended and balanced inputs and two sets of speaker outputs per channel. I assume the jacks in the centre of the rear panel are for system control via the PS buss. Power is rated at 2× 250w into 8 ohms and 2× 500w into 4 ohms. The Classic 250 will be available in March with an MSRP of $3,995. []

More from PS Audio...

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Latest additons 1st February 2002:

Sherbourn Technologies P7/1000
Sherbourn Technologies 5/1500A
DTS In-Car Audio Demonstration
DTS Multimedia Demonstration
Philips Pronto Remote Controls
Philips DVD+RW Recorders
Simaudio Titan & W-5 Amplifiers
WAVAC Audio Lab Model HE-833
conrad-johnson PV-12L & 17LS
conrad-johnson GAT
Quad ESL-989 & Verity Audio Tamino
Avantgarde Acoustic Duo & Uno
NHT Evolution Loudspeakers
NHT Evolution Theory & Design
Joseph Audio Loudspeakers
PS Audio Ultimate Lab Power Cable
PS Audio Power Director & Juice Bar
PS Audio Classic 250 & HCA-1 Amps
Morel Applause & Octave
Anthony Gallo Acoustics Due
Miller & Kreisel Multi-Platform
Miller & Kreisel Column Surrounds
Lamm Industries L2 Reference
Vacuum Tube Logic TL 2.5.1
McCormack Audio MAP-1 Processor
Cary Audio CAD-88 Amplifier
Toshiba Blue Laser Prototype
Draper Revelation & Hi-Def Gray
NHT Evolution Subwoofers
Von Schweikert Audio dB-99

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