Thanks Mike F and Bixby. I should be getting a JDS C5 amp soon, a move up from the PA2V2 (which I use out of an iPod Nano 5g). I also go out of my laptop when I'm working, either directly or through the PA2V2. But so far it's a pretty consistent issue, and one I don't face on my IEMs. It might not be relevant, but I also have a fairly good aftermarket car stereo without these issues. I should have mentioned that my 7520s are Sony B-stock, though they came with a manufacturer warranty and guarantee of 100% perfect working order.
The point about comparison is compelling. I had noticed that there was often a period of adjustment when first putting on the 7520s. An initial feeling that they were boomy and claustrophobic, followed by my conscious effort to note the parts I was hearing, the various frequencies, textures, and melodic lines. During this attentive listening that initial sense often evaporates. The problem is that it keeps coming back and nagging me. Like you said Mike, this leaves me unsure as to whether it's not just a subjective response on my part.
The process is like going to read in a little room with a table, chair, and a weak lamp. The first thing you notice is the low ceiling and weak light, and you think, I can't read in here! You sit at the table and pull out your book, and eventually you forget the room size and the low light. But every time you set the book down and look around, you're reminded, not to mention when you get up and leave the room.
Still, there are other times when the 7520s amaze me. Even with the tracks that give the boominess, the rest of what's there in the sonic field is much richer than with my IEMs. So it's occurred to me that they might just be more advanced and capable than whatever was used to record the albums I'm listening to.
In any case, I'd still love to A/B someone else's 7520s with mine, in Berkeley. A latte and a scone and some listening?
can I ask the obvious question? Any chance these are mp3 files? Sometimes lower bit rate mp3 or even high bit rate ones can sound pretty warm and rolled off.
Edited by bixby - 6/15/14 at 7:31am