Post your questions here:
Visit head-fi.org and go to the meetings, parties, get-togethers. Find out when there is a get-together in your area, contact the host, and just show up. You get to hear all the different gears and talk to people about it before spending any money. You never know, HD600/650 sound may not be your cup of tea.
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It is extremely difficult to effectively isolate a room. In particular, low frequencies move readily through structural features -- walls, beams, etc. act as sounding boards that transmit the sound. It is usually a big ticket item to isolate a room and requires construction. At a minimum it means extra layers of drywall and an isolating glue between the layers.
Go to the following site if you re still interested:
I had Senn 600 and then upgraded to Senn 650. To get an idea whan 650 can really do, you have to hook it to dedicated headphone amplifier; Singlepower MPX3 is an excellent pair for it. I tried it with headphone output of intergated NAD: 650 sounded lean and unimpressive, 600 was better with integrated.
Thanks for all the help guys. I am leaning toward trying to get a pair of Sennheiser 600s in the low $200s.
Thats too bad that the only way to knock down the bass is through costly construction. I was hoping someone out there would have some cheap tweak that would at least help the situation somewhat.