Selling a few HD650 - no modifications. All original accessories. However, there are variations of sound that might interest someone of SBAF: (Sold) I do not recall where I purchased the HD650 (S/N 317529xxxx). It sounds to me like all good HD650 do. (Sold) I purchased the other HD650 from @EagleWings. Though I looked for it, I could not locate its serial number. S/N 346680xxxx is printed on the box. This one has an interesting sound - like an HD580 up top and HD650 “standard” sound down low. (Sold) The HD6XX is still in the box. Selling these because I only listen to my modified HD650. These have been mostly unused - and I did not open the HD6XX. US shipping and PayPal included for $150. Open to all, as I figure Rando could benefit from these.