Originally Posted by mvw2
The C700/C751 is the most realistic sounding IEM I've used so far.
I only have two gripes with the Denons:
1) smiley face response, needing EQing to flatten out
2) low SPL capability, low excursion driver topping out (before distortion) at around half of most other IEMs.
With an EQ and a quiet environment, they are an exceptional IEM that few would beat.
That would make you a candidate for the Nuforce NE-7M which is flatter and doesn't have quite as much bass bloat with certain sources, or the slightly edgy tipped-up treble with some sources (i.e. less sibilance), but NE-7M have good deep bass and treble extension and are more efficient. The C700 are not too bad until you listen in comparison with others like the NE-7M or Phonak Audeo. Then the C700 will sound a little more like a closed can while the NE-7M will sound a little more like an open can.
I picked keeping the C700 over my old ER6i and SE310 and E4c because none of them could produce the bass of the C700 without amplification, while my C700 didn't need to be amped. They also fixed the dull treble in some older iPods. I found the C700 best right out of the headphone jack of the 2G Nano or 5.5G ipod video, or with a warm forward amp like Headsix that doesn't overpower them in the bass and treble and brings the mids in line with the rest of the freq curve. An amp that gets much better control over the bass will remove any muddyness, and the Predator is another one of those amps (while the Tomahawk is terrible with the C700 because of the highs).
Originally Posted by coolperl
I have C700 and D1001. Exactly the same sound signature, warm, fun and entertaining sound. I'd say, that straight from an Ipod C700 has faster response and a tiny bit more detail. So they should sound very similiar to D2000.
As above, they both are similar and that means they can have a little bit extra bass and muddyness with some amps or sources, and a little edgyness in the treble. I had to recable and woody my D2000 with partial markl mods to get the bass mids and treble in line with each other better, and they became a high end headphone. Still the best bass right below the Edition 9. I don't know of any physical mods for the C700 other than finding the right amp or source or EQ, but with the right source/amp they do rock.