FA-12S Class-A Head-Amplifier / Pre-Amp

(3 customer reviews)


Class-A headphone amplifier

SKU: FA12s Category:


FLUX FA-12S is the unique design headphone amplifier called to deliver great flexibility of your head-fi system with the engaging character of the sound which will not leave indifferent even the most sophisticated listeners


  • Class A
  • JFET inputs
  • MOSFET outputs
  • 64-step relay volume control attenuator
  • Premium components: Nichicon, TAKMAN, NIPPON, FUJITSU-TAKAMISAWA etc.
  • Powerful toroidal transformer

* Face panel colour option is available under the request

Additional information

Analog inputs

balanced XLR, single-ended RCA

Analog outputs

4-pin balanced female XLR headphone out, single-ended RCA preamp, TRS headphone out

AMP Frequency Response

1Hz-1MHz, -3dB

Output power

16Ohm : 2W RMS per channel, 32Ohm : 1W RMS per channel






>110dB, unweighted


>95dB, 20 Hz-20KHz

Output Impedance


Input Impedance

10kOhm (SE input), 3.3kOhm (BAL input)

Output Impedance Preamp

RCA 50Ohm


15.1dB, 23.9dB, 3.5dB

Power Consumption



EU-230V, US-115V


9 lbs (4.1 kg)


12.6 x 11 x 3.15 inch (320 x 280 x 80 mm)

3 reviews for FA-12S Class-A Head-Amplifier / Pre-Amp

  1. WR (verified owner)

    I took a chance on this fine amp after seeing Z-Reviews positive comments online. I have been a musician and audio enthusiast nearly my entire life (of 66 years). I am accustomed to the sound of high quality audio gear, and have recently gone down the headphone rabbit hole. I have Sennheiser HD600 and Audeze LCD-X headphones. As I have a large CD/SACD collection, I run a Sony XA5400ES CD/SACD player digital out to an RME ADI-2 DAC and then into the headphone amp. I can only directly compare the Flux FA-12S to the Drop THX-789 amp, and to my ears the Flux amp easily outclasses the THX amp in every meaningful audio way. The Flux has a fuller, more pleasing/organic sound from top to bottom, while maintaining a very solid clean, crisp, crystal clear presentation (without undue treble harshness), with no noise that I can notice. I’m sure there are better amps out there (for MUCH more money), but this amp pleases me completely. It has a terrific build quality and overall look (I got the blue front plate, very nice indeed), and the optional remote volume control works very well for me (now a slim black remote, updated from the one seen in the online video review). It also has plenty of power on tap for me…the highest I can raise the volume control using the LCD-X’s (without my head exploding- I hate that) is around 1-o’clockish on the “high” output setting. The rear preamp RCA outs are a welcome addition as well- great flexibility indeed.
    Kudos to Flux for offering such a wonderful sounding, beautifully made headphone amp at such a reasonable price. Very Highly Recommended!

  2. seboemer (verified owner)

    It is an smooth sounding amp in a good way its musical and also detailed and has a lowend punch and crispy top,no harshness in the treble.
    Icant think of any better amps out there fore 500usd its higly recomended its a great amp also powerfull.

  3. Christopher Harmon (verified owner)

    Stunning. I came from a Schiit stack to this and it has so far blown me away.

    I know what “scales with gear” means now. My HD6Xxs are another headphone entirely. Detail and timbre are hard to articulate, imaging came out of nowhere, clarity in the highs I thought they simply could not do are now articulate, and even a little more soundstage came from it.

    My Aurorus Australis so thoroughly tricked me into forgetting it was a closed headphone I now wonder what TOTL opens would be like, be it a Borealis or something like a HD800, ZMF, Hifiman, or LCD. Detail, imaging, stage, dynamics, and musicality that defies elucidation come effortlessly, and not only distracts me from work, but drops my jaw.

    This amplifier cannot be recommended enough once you’re ready to move up in the head-fi world.

    Customer service was always responsive and courteous. Flux knows how to make a great amplifier and I look forward to seeing what will come next from them.

Add a review

Your email address will not be published.