I put up my he-500 for trade, basically I could not justify the cost of buying an additional amp just to power these. I also want that bass from the he-400 back, overall I didn't notice a huge difference from the 400 to the 500 except for basically a lack of distortion and a forward mid range.
What were you currently powering them with? The bass on these are sensitive to amps.
Also how long have you had the HE-500's for?
Edited by Zoom25 - 5/9/13 at 4:15pm