I'm planning on purchasing the AD900 or the AD900X soon, and am wondering how the bass and speed on those compare to the HD598, which I like. It's my understanding the HD598 does not have a lot of bass in general terms, but I like the amount it has, as I'm not a bass-head and don't want the sound over-saturated by the low end. I also like an upfront sound with good speed. The HD598 is a little laid back speed-wise, but I still like it for other reasons like its resolution and comfort.
From reviews, the AD900X has more bass than the AD900. But using the HD598 as a guidepost, does the AD900X have more bass than the HD598? About the same? Or less? And do the AD900 or AD900X have more speed compared to the laid back HD598?
Appreciate any help. I tried looking at reviews before posting.