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Just checking because on another thread someone had trouble with Pro 900s bass quality on higher levels and had to keep it on the lowest level
The question is more why you want to raise it more?
Most of my bassy headphones sound best if set to lvl 2-3 on ZO1 or ZO2 lvl 1-2, above that bass gets a little excessive, it doesn't sound bad it just gets excessive IMO. While I could for example max bass on XB500 without it distorting it's just way over the top, like putting the ear next to a sub. xD ZO is more responsive to set source volume it seems though, at least if you use the headphone jack, the lower source volume set the less likely to distort, since I get like plenty of volume at like 11 - 13% with XB500 it's no trouble maxing the ZO and it won't distort, it might not allow that on 30~50% volume though for example with a hard to drive headphone. I believe this is partly kx mixer's fault though. Then I have no idea how it reacts if WASAPI/ASIO is used as I can't use it when I lack an external volume control (way too high volume levels for it to be usable).
It depends a bit on the source as well how good it sounds while boosted. Currently listening to ZO1 maxed out for testing purposes on XB500 using Realtek HD onboard (since I have to use the onboard sound to get normal volume levels in Elder's Scrolls Skyrim due to some bug) and it doesn't sound THAT bad, the mids and highs are totally unaffected while no bass is played too so that's nice. Unusually controlled and not a single-note bass I still hear the upper and deep bass notes separated if playing hardstyle for example despite it feels like I've got 2x8" subs strapped on my head (after all we're probably talking about like 25dB bass boost over mids here as XB500 got like 15dB boost of its own). I'm really suprised how much ZO improves Realtek onboard, it turns it into into another sound card device, from a bit annoying to use, to very acceptable sound quality.
Man you should hear or more like feel how ridiculous this sounds like with XB500 + ZO at max:
If you've sat in a proper car setup with at least one properly powered good 10 - 15" sub it feels the same thing is going on in my head now, it's like sitting in a windtunnel from the 20 ~ 35Hz goodness. And the best thing is the vocals are still very clear, just a little silent compared to the bass.
Would love to see the face of a typical Beats owner that's of the opinion more bass = the better when he'd hear this without telling him about ZO. Even stock XB500 seems basshy in comparision after you've listened 10 mins to this.