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I will add to this as I go. Still figuring them out. All opinions are thus a work in progress and I might change them.
11/16/08 Update:
You know, the only really apparent shortcoming is that the 900s just do not extend as far into the upper registry as higher end cans. Other than that, they are just a killer detail can in the mid range until they get a little muddy in the lower mid range and bass. This could be my interconnect and amp too. With better equipment than my modest setup, the sound should be noticeably different.
I will gain some perspective when my Stax get here.
Still a very good sound for the $$.
10/29/08 update:
I just got my cmoy with the 2770 burr brown op amps and using batt power for now. I will get an adapter soon.
Both headphones benefit from an amp. Sound is fuller and more controlled. A definite step up but no more than a good solid bump up in terms of dynamics. Fleshing out the form so to speak.
original post:
Both use the same drivers. Both are pretty comfortable. Well built. Both are extremely good for the $$. Both have long ass cords so going behind your pc is NP.
700 is semi sealed. It is technically not sealed but close to it.
+ Tight sound. Easy to drive. Small and tough enough to be portable if you don't give a f what people think lol. I can jog in them! lol
+Detail is good, bass is decent, speed is good. Can be fine for gaming and movies will be good for dialogue.
- A bit hot at times. Not always but if your room and you are a bit hot it can get sweaty.
-Not the best highs. I feel like they can get a bit bright at times.
-Bass is good and there but not as big as the 900s.
-Sound stage is smaller than the 900s. About twice as small really. This can be a good thing for some musiclike rock but overall the 900 sounds better with its bigger sound.
+ Headband is mesh but still excellent. Comfort is good if the clamp is a little tight.
900 is semi open. It has a metal mesh ring surrounding the exterior of the cup.
+ Great pads. Very leather like and soft. Similar material is used for the headband which is also comfortable.
+ Sound is pretty big. Impressive presentation for a sub $300 headphone much less a $60 one.
+ Detail is wickedly good for any dynamic headphone. Some of the high end headphones are better but this 900 is good at detail. Separation is also excellent as is balance b/w bass mids and highs.
+/- Smooth sounding with slightly rolled off highs.
The 900s have more bass than the a900s and a bigger sound stage thjan the ad900 imo.
I need the cmoy first but I will say that although the detail level and sound/instrument separation is awesome, I do find them lacking in comparison to high end dynamics in terms of absolute sound quality. They are not quite "there", especially compared to Stax or a Senn 650, Akg 701, Beyer 880 etc. They are better than a DT770, but also than a A700 or AD700 b/c the sound stage is as big and the bass way stronger.
