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DarkVoice 336SE OTL Headphone Amp

DarkVoice 336SE OTL Headphone Amp

Complete Setup:
Massdrop x Sennheiser HD 6XX Headphones
ADV. Headphone Hanger
Drop Earpads for HD 6XX & 58X
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Low Distortion Amp

Headphone amplifiers come in a variety of circuit designs, each with its own advantages and drawbacks, but there’s one main determining faction: distortion level. Credited with having the lowest possible distortion, Output Transformer-Less (OTL) headphone amps cut out a key part of conventional amplifier design to eliminate a major cause of audible distortion. Without the Output Transformer, you get clearer sound, powered tubes, and overall better amplification. Arriving with an OTL design, the DarkVoice 335SE OTL Headphone Amp gives you a blank backdrop to properly broadcast your favorite jams.

Note: All units come with a 110V power supply. 

DarkVoice 336SE OTL Headphone Amp

Design and Function

While you can’t very well drag your headphone rig into the middle of any empty NFL stadium or get air dropped onto a deserted island, music always sounds better surrounded by complete nothingness. With the DarkVoice, the deep blackness lets you notice every note like never before, adding a dimension of accuracy that’s usually cloaked in distortion. To fill out the space, the 335SE puts out warm mids (courtesy of the tubes), analytically detailed highs, and fully transparent bass. By pairing together tube warmth and OTL circuit design, this amplifier produces the cleanest warmth we’ve come across.

DarkVoice 336SE OTL Headphone Amp

Durable Construction

As solid as a rock, every visible surface on the DarkVoice 336SE is either glass or anodized black metal. Rounded out with gold-plated RCA connectors, a metal name plate, a high quality potentiometer, and a power supply enclosure, this heavy duty piece of equipment- weighing in at 11 lbs- feels as solid as it sounds.

DarkVoice 336SE OTL Headphone Amp

Packed With Power

If you’re still looking for more function, the DarkVoice 336SE OTL Headphone Amp is capable of powering headphones with up to 600 Ohms of magnetic resistance, as well as operating as a tube-based pre-amp for your speaker system. When you want great sound without going over budget, use the 336SE as a headphone amplifier and speaker pre-amp to hit two birds

DarkVoice 336SE OTL Headphone Amp
DarkVoice 336SE OTL Headphone Amp


Here is a great review from Unbox Therapy about the DarkVoice. Make sure to check out his YouTube page for even more awesome unboxings and reviews.


  • DarkVoice
  • Tubes: 6N8P and 6N5P
  • Impedance: 32 ~ 600 Ohms
  • Frequency response: 10 Hz ~ 30 kHz +/-1 dB
  • Signal-to-noise ratio: > 100 dB
  • Power handling capacity: 1 W
  • Distortion: < 2%
  • Output: 1/4 in (6.3 mm) stereo jack, RCA jack for pre-amp
  • Input: RCA jack
  • Power supply: 110 V 
  • 11.81 x 5.98 x 11.02 in (300 x 152 x 280 mm)


Estimated ship date is Oct 10, 2022 PT.

Payment will be collected at checkout. Cancellations are accepted up to 2 hours after checkout, after which all sales final.

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Top Customer Questions17
What is the output impedance (not the headphone impedance range, which is what seems to be erroneously listed as the impedance of the amp itself in the specs)
Mar 26, 2021
Top Answer
78 ohms from 300 Hz and up. More
Mar 26, 2021
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What’s a good Dac to pair with the darkvoice
Feb 9, 2021
Top Answer
I'm using a Topping DX3 Pro and it sound great. The DX3 is neutral bordering on bright, and the DV balances it with just the right amount of warmth and that tubey sound. Plus the DX3 has a RCA out...Read More
Feb 16, 2021
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Can this amp be used as a daily driver and left on for 16 hours a day? Or is it really just designed for a specific listening session? Sorry I'm new to tube amps... I know you'll burn up tubes quicker this way but are there any other problems to be concerned with?
Dec 16, 2021
Top Answer
I’d imagine it might over heat at 16 hours as this amp gets pretty damn hot after 1 hour of use. I have gone as long as 5 hours with no adverse effects. If you plan to burn in a driver tube, I’d...Read More
Jan 3, 2022
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