FS: Pass HPA-1

Price: $2,100
Currency: USD
Ships to: CONUS

Excellent condition.

“The HPA-1 headphone amplifier was designed ground-up to become what we believe is one of the very best sounding headphone amplifiers available today. With low feedback, wide bandwidth and a direct coupled MOSFET output stage, this musical instrument drives even the most difficult headphone loads with ease, power and grace. The HPA-1 also functions as a line-level preamplifier that sonically rivals much higher-priced competition. The measured performance is superb and the sound even better.”

Gain (dB) 8 db
Frequency Response 10hz – 100hk-1 dB
Output Power into 20 ohms 3500 mW
THD + Noise < 0.005 at 1V out
Out Power into 300 ohms 200 mW
Input Impedance 50K Ohm
Output Impedance < 2 ohms
Power Consumption (Watts) 23
Unit Dimension (W x D x H) (In.)|11 x 13.5 x 4|
Unit Weight 14 lbs

HPA-1 Owners Manual


Uh oh, @ValentineLuke

1 Like

Oh my…



Nice piece of gear, always been curious about the sound.


As far as solid state amps go using a MOSFET transistor design this is the best headphone amp you can get. I’m obsessed with portability, so I can get away from my 2 yr old, I’m gonna spring for the woo audio wa 8 come November.
If I wasn’t I’d be all over this.

Whoever gets this amp your good for years to come.


Must resist…if only my cables weren’t terminated XLR (good enough excuse?)

I’ve heard this amp ( well not this one) at a friends and its awesome. Of course I enjoy Pass gear :smiley:

1 Like

This amp is still available.


Very interesting, Good job and thanks for sharing such a good blog.