EDIT: digiZoid ZO2 is $119, twice the cost of FiiO E11 at $59. The ZO3 will be a bit expensier most likely.
He meant the opposite, FiiO E11 is also slightly boosting the lower mids. It starts affecting frequencies below ~1000Hz while on digiZoid it's set at below 300~500Hz and the digiZoid has slightly deeper configured bass boost too. IMO the digiZoid has the best bass boosting ability. Especially the uncommon version v2.1 that I have can give some serious nicely sounding powerful boost, I feel the bass tickling my ears when the volume levels are kept reasonably low still, in my case I have set the ZO v2.1 digiZoid amp at 2 or 3 steps from the lowest volume level (this is due to my noisy onboard audio) and windows volume at 31% and I can still feel the bass tickling at every beat with my Q40 when listening to my hardstyle tracks. =)
To me no headphone provides satisfying bass without the ZO these days. I used to use EQing before but I can't seem to get equally satisfying result with EQ'ing as letting the ZO to do the job. I demand both quality and quantity. The ZO has been configured so that a lot more current is being focused into lower frequencies as those demand so much more power, this leads to more controlled & tight bass that doesn't affect the rest of the range as much.
I just hope ZO3 will deliver, it's set to have a lot stronger amping and the older ZO amps are somewhat underpowered (you will experience clipping if going overkill volume/bass wise but when you keep the volume levels within somewhat reasonable range, then this device will sing! The ZO3 will probably improve on this aspect though for you SPL nerds :p)
Edited by RPGWiZaRD - 3/20/14 at 11:29am