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what colors you using? Might have to buy another ZO2
I'm currently listening with around yellow range on both, I tried going red briefly, didn't make it a whole lot bassier, a little for sure, it seems it makes a lot bigger difference with the last/second ZO in the chain, the ZO2.3 in low gain provides a lot less of a bass response change than the second ZO, ZO1 in this case but it's quite expected. I don't either think it would be good at all to run both ZOs with high gain so at least one of them has to be put into low gain for sure to avoid too loud output/hot signal and it makes obviously more sense to put the first ZO in low gain to not feed too strong signal to the 2nd ZO.
Next I'll try with my cheap Philips headphones that has bass quantity equal to AD700 or something, ie almost non-existant, tin-can sounding and see what it does to this headphone
EDIT: Seems like I turned my Philips very basshy headphones to abo XB500 headphones lol. There's a bit noise from the drivers struggling, but not too bad and it's mostly there with deep basstones (the driver doesn't handle deep bass very well for starters). That I'm running both ZOs with max contour level and onboard realtek chip at 30% vol I'll say that's pretty satisfactory result haha. Believe it or not but the Philips sounds quite nice like this except for the slight noise from struggling drivers. If lowering the bass contour levels a little, say around yellow the bass clipping / noise in the bass disappears completely though and the bass is still very strong for this heaphone (maybe around XB500 levels or close) but the mids and highs remain a bit clearer though.
EDIT: Very impressed how it sounds like with these cheap but otherwise very clear and neutral sounding philips headphones except for the rolled-off bass when set ZO2.3 to green + ZO1 to yellow which takes care of the bass and make it basshead worthy even. I didn't think the day would come when I'd be tapping my foot & headbanging to hardstyle with the basslightest headphone I've tried.
EDIT: It's actually amazing how I started enjoying the quite cheap Philips headphones with double ZO-powered.
They have a very large and airy soundstage due to semi-open design (actually more like open as the seal is extremely poor) but have always sounded very lifeless with little dynamicness and laid-back. With 2x ZO they sound very engaging while keeping an awesome large soundstage.
I'm seriously thinking about picking up a pair of AKG K550... I'd believe with ZO double-amped would sound pretty much what I've been looking for. M-Audio Q40 are excellent except I wouldn't say no to more airier soundstage and more forward and detailed lower-midrange especially which is exactly what AKG K550 should bring.
