To600 has a very full mid bass and low mids, the issue for me was there wasn't enough extension below 50hz to balance the heavy mid bass so you do get that bloated bass sound without much depth.I'm listening to my EBX right now (Hiegi Donut over Hiegi Full Foams) on the Balanced output of my iBasso PB2 Amp (2x Burson V6 Classic op-amps), and I agree that they have good Bass extension, and then a bit of a recessed Mid-Bass (which robs them of some realism).
If you get a chance, listen to a set of K's 600 earbuds (I've modified mine, by installing a 2.5mm TRRS plug).
They've got really "real" sounding Bass.
That's with the stock SE cable anyway. I honestly dont know if balanced makes a difference but I think the driver or housing/tuning is limiting the bass depth.
The to600 is a bit mid centric because of this with both a full warm midrange and slightly bright low treble (not very fatiguing just slightly elevated). I'd rather slightly less bloat in the middle frequencies and slightly more energy on each end but that's just me. Although the upper treble is perfectly fine on the to600 as its not too dark, its more about the relation of mid bass/low mids to the sub bass.
Theres one vent on the bottom, so it can be quiet easy to manipulate the sound for a bit tighter bass but you'd probably have to use double foams then because it becomes quiet bright. But the thick shell may not play so well with double foams... Although I would like to hear these drivers in an mx500 shell out of curiosity, might be a completely different beast!
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