I've heard both though I still haven't figured out exactly what to look for as quality mids go so I can't say. FWIR the 780s don't have recessed mids while the Dt770s are quite recessed.
I owned the ALO-780, which are just the HFI-780 with a jena recable and internal mods and I can say the mids were extremely recessed, especially when compared to my Grado HF-2. They sounded wonderful up until my HF-2 arrived. Then, the tables turned and I couldn't stand the 780's
Oh come on! The HFI-780 are bass-light compared to the bass-heavy K701, HD600 and DT880...
The 780 are somewhat recessed when compared directly with some more forward sounding headphones which Grado most certainly are, they aren't however as recessed as DT770, HD600 etc.
Also the HIFI-780's need atleast 300 hours to be burned in. They dont sound the same to what they used to sound at first use. Same goes for other ultrasone Models, they all need 300 hours. Also HFI-780's love being driven thru a headphone amp. Even tho they can be used without one.
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