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Amplifier HSA-1c

Headphones amplifiers

HSA-1c is an improved version of our famous amplifier HSA-1b. The new version offers you uncompromising resolution and refinement of musical details and an extremely powerful output stage.

We tried to give it additional potential in driving planar and dynamic headphones. By choosing HSA-1c, it no longer matters which headphones you connect to it.

Uncompromising in the presentation of musical material, it reveals new details that you have not heard before.

With the HSA-1c you don't have to make compromises in the choice of headphones. It doesn't matter if they are ribbon, dynamic or planar headphones. It is not affected by their different impedances and powers. HSA-1c is powerful but also gentle in its presentation.

What makes it uncompromising:

-  Fully discrete technology without integrated (hybrid amplifier) circuits and SMD components. This approach gives us greater liberty in selection of components and thus the possibility to choose the most optimal elements for the given function

-  a powerful and robust output stage with quasi complementary pair (quartet?) of output transistors with a total power rating of 300 watts per channel and possible impulse currents of up to 8 amperes.

-  input stage  single-end without capacitive input compensation.

-  biasing stage in pure A-class also without capacitive compensation

-  vollume regulation via 24 position attenuator. Channel difference less than 0.1dB

-  all elements have been carefully selected through a large number of hearing tests, with the aim of reaching  very high level of reproduction it can directly drive ribbon, electrodynamic and planar headphones and, in addition, loudspeakers of the highest class.

There is a saying: Look at your mother first before marrying your daughter.

In support of this, we would like to mention the review of HSA-1b by Mr. Peter Pialis (Website:Headphones Guru).

The HSA-1b has punch, dynamics and a level of transparency that is truly outstanding and will have you staying up late at night just to listen to one more track. If you already own the SR1a headphones and are looking for an end game amplifier, look no further than the HSA-1b amplifier! Especially if you’re like me and have a collection of other great headphones that you’re looking to drive, this amplifier will scratch every upgrade itch you may have in the future! Highly recommended!

The HSA concept has its own impressive history, which you can see in a series of successful reviews listed on our website.

The texts of renowned reviewers listed on our website in the sub-menu > Our References speak volumes about our construction approach and reproduction quality.

MSRP Tax include Europe: 5500 USD

Export  price free Tax: 4500 USD

Price (MSRP):1,00USD

Load Impedance headphones out - direct

0,3- 600 ohms

Load Impedance speakers out

2-8 ohms

Output Power (one chanel driven):

32W/2 ohms, 20W/4 ohms,10W/8 ohms, 5W/16 ohm,  2,5W/32ohm, 1,25W/64ohms, 0,6W/120 ohms, 0,3W/300 ohms, 0,15W/600 ohms at 1khz/sine

Frequency Response:

500mv/ in/sin.  15hz –  500kHz  (-1dB/ -3dB)

Power Bandwidth:

120kHz (-1db) at 1W 


< 0,3% at 1khz

Signal to Noise Ratio:

Better than 95dB

Input Impedance:


Input Sensitivity for full OUT:

0,6V at 1 kHz

Input Connections:

INPUT 1- 2 RCA Single-Ended, INPUT 2 - 2 XLR 3-pin Balanced (female)

Output Connections:

2 x XLR 4-pin female (balanced Planar & Dynamic headphones)

2 x 6.3mm stereo jack (Planar & Dynamic headphones) 0,3 600Ω

Speakers OUT 4mm banana conector

Max Power Consumption:

150W, without signal 20W

Workng voltage:

110V/220VAC (selector switch) or 100V (requires internal connection)


Height 90mm, Width 218mm, D 320mm (3.54 x 8.58 x 12.60 inches)


netto 6,1kg / brutto 7,3kg

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