I see that you finally purchased the Velvet. Congrats! Sony A15 is one of the fullest sounding DAPs in the market. Try increasing the 0.4 and 2.5 bands in the EQ by one or 2 notches to see if it improves the body in the Velvet.
Be aware though, while this may add body, might result in a darker sound.
Thanks...yes, after struggling to get from IE800 what I would have like but without success (especially for EDM) and not being impressed at all by the XBA-H3 and W40, I came back to the Velvet when I saw that a new version was released - this is V2.
Briefly, I can say that I definitely prefer the havy (thanks to the sub-bass) and the more musical sound of the Velvet over the dry and thin IE800 sound.
Very impressed by the bass - quite amazing for a BA. I like the balance between the mid and sub-bass and that with all the bass enhancement, it doesn't become fatiguing or is covering the other frequencies (in the tight & balanced settings).
Even if the vocals are more natural and emotional on the IE800 (especially the male vocals), I don't find the Velvet having the vocals too thin or distant, while for the treble, I like the IE800 details but I clearly prefer the Velvet because, while being lively, is nowhere like the tizzy and fatiguing IE800 treble.
Overall, a very nice combination of bass, details and clarity.
A15 may be one of the fullest sounding DAP but I think the Velvet will benefit more from a better dac and amp, as happened already with the IE800, when I paired them with the Fiio X7.
I've increased even from the begining not only the 0.4 and 2.5 bands, but also the 1.0 one. Still, I'm trying to find a sweet spot, playing with the dial, EQ and the tips.
Or maybe my brain just needs some time to completely adapt to this signature.