Originally Posted by 12thgear
I actually got the HD 25-1 II the other day thanks to a pretty decent Newegg sale. They definitely are bassier than my HFI-680, especially midbass, but their bass is a little looser too. I also find the HFI-680 treble to be smoother. I think the HD 25-1 treble is a bit of a mess, actually. These quick impressions were with a Mac mini running through a Corda Arietta amp.
I didn't know what to expect, obviously the 750's are more expensive and the specs show quite a difference in lower frequencies. In terms of an out an out comparison, the 680's are more metallic, the 750's ... smooth.
I run straight out of a Mac as well, but to be honest, until i get my ibasso D10 or Ray Samuels Predator (when i bump off the soon to be ex-wife!), the best amp i feel is me little ol' Go-Vibe V5 amp. I've tried a few, but it just suits the Ultrasone's well.
I have to say that ultrasone is fast becoming my manufacturer of choice. I love my 750's over the HD650's... i do want to get my hands on the HFI-780 and 900's ... the HFI-15G are one of my favorite portable headphones, and I always say that the HFI-15G's are THE
most comfortable headphones I have!
However the 680's are better suited to hard edged electric recordings,more so than the 750's. Lost (D. Ramirez Lost In Rave Mix) is just awesome with the 680's..... ah yeah baby, the 680 really like this track. I feel my 750 may become a little redundant. certainly time to ditch my HD650!