Hey Soundmig. I have a lot of experience with the Sparkos op amps (as well as several other op amps). The Sparkos are an excellent way to get a true Class A circuit in your device. However, they do suck a LOT of power. I see you have four single channel Sparkos (SS3601). It may not be too bad, but you could see a huge improvement by increasing the size of the capacitors in the main power supply. Look to see if you can get something like 2 x 10,000uf (or as large of a capacitor that will fit).
In addition, soldering a Nichicon Muse 47uf + a 0.1uf MKP directly to the power pins of the Sparkos (pins 4 & 7) will give you faster response and better resolution for mids/highs. I use Vishay MKP416 for the 0.1uf (Vishay part # BFC241641004). This give the op amp more localized power to pull from for those immediate transients.
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