(copy/pasted my review from the review section)
This is an upgrade (SS3601 and SS3602)
Pros: Clarity, detail, black background, transparency, slight increase in power
Cons: Slightly too large to use the X7 cover, not the cheapest upgrade in the world (if you go for all 4 op-amps)
First, a little about me. Skip this if you want to get right to the meat and potatos.
I've only really been getting into audio since August 2016, with my purchase of the Sennheisher HD 598 paired with my (at the time) Asus ROG Phoebus sound card.
My eyes were opened to just how good sound could.. sound.
I've always had an interest in audio, being a guitarist and gamer, but this being said - I am not a well experienced audiophile, but I am a hobbyist with a bit of an obsession.
Also, thank you Andrew Sparks! He was an absolute pleasure to deal with, would reply quickly and answer any questions I had. I will note that I received a slight dicount for this purchase, as it was of 2X single and 2x dual op-amps.
Gear used
Creative Soundblaster X7 (which these op-amps are in), 2x Sparkos SS3601 single op-amps, 2x Sparkos SS3602 dual op-amps, Hifiman HE400i, AKG K712 Pro, Fidelio X2, Little Dot 1+ (with Mullard M8100 tubes and original X7 dual op-amp), Klipsch RP-160M bookshelf speakers.
Impressions
The Creative X7 was already a completely satisfactory amp/dac, in which I could find no faults. I was debating buying another amp/dac such as the JDS Element, but decided first after reading some reviews that I would squeeze the most that I can out of the X7.
Well, I'm glad I did. The differences aren't going to be like going from on-board to the X7, or like going from the HD 598 to the HE400i. However, the sound didn't improve in one area - it was improved all around, in a seemingly even way. Sound became louder, more transparent, details were a touch easier to pick up on (some new details in songs were brought to light), I could turn up my volume higher with the X2 before I would hear the noise floor and overall it helped for gaming, as imaging seemed to pick up a touch of accuracy.
I've been leaving the X7 exclusively in high-gain mode, I don't have the ears to notice an improvement apparently, as some say there is a fuller sound to high gain, but any of my headphones are powered easily though they are all sub-100ohm.
I received my Klipsch speakers only a week before the Sparkos op-amps, and I broke them in with pink noise and media for around 50 hours. Switching the op-amps was noticable with the speakers, as well as while using the LD1+ tube amp and X7 only as a DAC.
I have not used any other op-amps to compare to aside from the stock ones.
My overall impressions are that if you like the Creative X7, and you want as much as you can get out of it - this is worth it. It's like the stock op-amps had the X7 at 85%, while this upgrade brought it up to 100.
I ended up making little feet after this photo, so the X7 now sits higher
