PS Audio HCA-2 Power Amplifier - Hybrid Class A Power at its Best


150W of cool clean power from a modestly sized amplifier, built to the high standards you'd expect from PS Audio.

Working as it should and fully tested in our lab and listening room.

Also comes with its original shipping carton.

Standout Features Include:
• 150 Watts Per Channel into 8Ω
• 225 Watts Per Channel into 4Ω
• SDATTM output stage
• Balanced JFET input stage
• Single ended (RCA) and balanced (XLR) type inputs
• Fully balanced internal architecture
• WBT 5-way binding posts

PS Audio HCA-2 Power Amplifier - Manual

Power Rating:
(Both channels, Stereo)
8 ohms - 150 watts per channel
4 ohms - 250 watts per channel
2 ohms - 275 watts per channel

20 Hz to 20 kHz

+/- 0.5 dB

0.2% @ 1kHz (full power)

Voltage Gain:
24 dB

Input Impedance:

35 lbs

(W x H x D)
17" x 4.5" x 14"

More from PS Audio:

Congratulations! You have just taken a step into an incredible new dimension of the audio world. The Hybrid Class A stereo amplifier, or HCA-2, represents a revolution in the innovation and design of amplifier technology.

Analog-only amplifier circuits have been refined over and over for the last 100 years to a point where we hardly expect to gain any further significant achievements. Attempts have been made at pure digital designs only to yield results that certainly leave much more to be desired.

The HCA-2 is an audiophile’s first look at these two concepts being blended into one: a hybrid amplifier with a fully balanced, Class A input stage and a truly state-of-the-art digital output section known as SDATTM.

Design Overview
The HCA-2 is a stereo (two-channel) amplifier rated at 150 watts per channel into 8 ohms. It is comprised of two main stages: the input stage and the output stage.

The input stage is the heart and soul of the HCA-2’s sound. A fully balanced, Class A input stage that can be fed by either single-ended RCA connectors or the balanced XLR type.

The output stage of the HCA-2 is our unique Super Digital Amplification Technology SDATTM circuitry that provides an absolutely linear response into any loudspeaker load. SDAT circuitry is not load sensitive which assures that the frequency response will not change regardless of the loudspeaker load.

The HCA-2 represents a state of the art power amplifier that is affordable, efficient, and can be used to glorify the beauty and passion of recorded music in ones home. We trust you will enjoy the HCA-2 for years.

The SkyFi Testing Process for Solid State Amplifiers:
We start with a visual inspection of all internal components to make sure there are no signs of stress or aging. Capacitors are checked for telltale sings of bulging or leaking, resistors are checked for signs of overheating or cracking, and transistors are checked for signs of stress or damage.

We then power up the unit carefully and run a simple 1k sine wave while monitoring the output on an oscilloscope for signs of distortion or noise. Finally, we run the amplifier to its full rated power into the appropriate resistive load provided by our Sencore amplifier tester. If there is an issue, it will usually be noticeable at this point. If everything reads clean, we will often test for THD (Total Harmonic Distortion) measured by our Keithley distortion meter, and compare it against the original manufacturers specifications. The amplifier then remains powered on to "burn in" on our test bench for a few hours to make sure there are no heat related issues. If there are balanced inputs available they will be also be tested.

Final testing involves pushing actual music thorough the amplifier. We've learned over time that some issues are only noticeable to a trained ear while listening to familiar source material. Our test bench has reference vintage KEF speakers that we're very familiar with which quickly reveal any discrepancies. Some amplifiers will then move into our listening room where they are tested with our in-house reference speakers of choice.

Please click here for detailed specifics regarding our specialized packing process that separates us from the rest.



Original Box





Not Applicable


Yes - Power

Physical Condition


Working Condition


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