SparkoS Labs SS3601 and SS3602 Discrete OP Amp Review


Having already reviewed the Burson OP Amps I thought it would be good to also have a gander at the SparkoS dual and single OP Amp offerings to see how they compare so I managed to get my hands on a pair of singles and a pair of duals for testing.

I would like to thank Andrew who is the second head honcho to Lütz over at SparkoS Labs for sending me these to review and enjoy.

SS3602 Dual Discrete OP Amps

Test Setup Parameters

For testing, I had the SparkoS OP Amps installed firstly in the Burson Swing DAC, then in the Whammy and the NuHybrid headphone amps. When testing in the Burson Swing DAC, I used standard IC OP Amps in the headphone amps and then when installing the SparkoS into the headphone amps, I reinstalled the stock NE5532/NE5534 OP Amps back into the Burson Swing DAC.

For reference, the standard IC OP Amps used are the OPA2107 in the Whammy and the OPA551 in the NuHybrid.

I will again be using my trusty HiFiMan HE400i headphones for listening and the music I will be testing with is mainly Lindsey Stirling with her 2014 album: Shatter Me and her latest album: Artemis but also Evanescence Synthesis album.

First Test – Burson Swing DAC

SparkoS SS3601 singles and SS3602 duals installed.

I spent a few days listening on the Whammy and the NuHybrid with the Burson Swing DAC connected. I was pleasantly surprised by how bright the mids and treble sound.

I remember reading other reviews of the SparkoS OP Amps and many people described the same bright sounding signature which appeals to some folk but not others.

I personally like the bright sound as it appears less neutral and sounds quite detailed. When listening to Lindsey Stirling, her violin really shines and you can pick out all of the different sounds that can be heard on her tracks.

That said, when I listened to Evanescence, Amy Lee’s voice was crystal clear and you could immerse yourself in the instruments as if you were up there on the stage with her.

I do like a neutral sound for reference and comparisons mainly but I think I also like the bright sound that the SparkoS have to offer for a more chilled out listening session.

Second Test – Whammy Headphone Amp

SparkoS SS3602 dual OP Amp installed in the Whammy.

This is a tough one and to be honest I don’t really see much difference having one of the SparkoS SS3602 duals installed in the Whammy as opposed to having the full set installed in the Burson Swing DAC.

Maybe moving the OP Amps further up the audio chain could make a difference to someone else as sound is almost always subjective but I cannot notice any difference.

As many of you will already know, the Whammy is quite neutral sounding with bass not being so prominent like the mids and the treble compared with other amps.

Either way it still sounds impressive with all the detailing you could want without being overkill. I also watched some TV and listened to some of my favourite high quality music videos on YouTube and I must say I enjoyed the experience of the bright and wide soundstage.

Final Test – NuHybrid Headphone Amp

SparkoS SS3601 single OP Amps installed in the NuHybrid.

After listening to this combo for a few days I find I keep coming back to this setup when wanting to watch TV or just put my feet up and chill with some music.

This to me seems the best combination between the two headphone amps, with the bright sound of the SparkoS SS3601 singles combined with the warmth of the Korg Nutube in the NuHybrid this is certainly quite a nice combo.

Just the right amount of bass, non fatiguing and an all round pleasant listening experience.

Closing Thoughts

Well its true what they say that every OP Amp has its place and the SparkoS are certainly no exception to this rule. If you like bright mids and trebles and a wide soundstage then these are the OP Amps for you but coming back to the Burson OP Amps, I find each has their own merrits and unique sound signature.

For me, I like the SparkoS in the NuHybrid more than the Burson V6 Classics because of the bright and warm combination it creates but I prefer the Burson V6 Vivid in the Whammy over the SparkoS as it has a more balanced and controlled sound signature.

Overall these are damn good OP Amps and they could really shine in the right application depending on your preference but that is what OP Amp rolling is for. Right? It’s nice to have that choice.

For more information about these products and other products please visit

SparkoS Labs SS3601 and SS3602 Discrete OP Amps






Sound Quality


Customer Support



  • Fully Discrete Class A OP Amp
  • Built with high quality PCB and components
  • Excellent soundstage and sound detail


  • Maybe a bit too bright for some audio enthusiasts
  • Packaging not the best. Need protection on the pins
  • Footprint could be too large to fit in some audio applications

5 thoughts on “SparkoS Labs SS3601 and SS3602 Discrete OP Amp Review”

  1. Is bright the correct word to describe extended high frequency ? The bypass capacitors used with the Spakos can be huge to the final outcome. There tune playing abilities are spot on to my ears.

  2. Hello. Perhaps at some point you could also test this operational on the basis of discrete elements:


  3. I read your great review. I have been using the ss3602's for about 8 months and yes, they were bright and tilted up in the treble. But after about a month or two the treble tilt has really smoothed and fallen in line with the rest of it's presentation. It now sounds analog-ish. I'm comparing the Burson V6 Vivids and the Vivids are much more forward, squeaky-clean, and mid-focused. The Sparkos are more laid back in comparison and give a more broad and wider sound-scape, with better vocals and better understood backing vocals. Each have their benefits depending on the rest of the chain. Happy listening.

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