Monitor speaker with the best bass at $500 used

fully agree with rrog re: the vs vr1s--they're a great, well-built speaker with massive thump for their size. $500-$550 is the correct used price--i've never seen 'em significantly cheaper. you could also look at polk lsi9.

Zydo, I am sorry but the PSB Alpha 1 reviews are not convincing to me; they have little bass. In addition, I would use them occasionally as an alternative to my main system speakers, but they would be plugged into major electronics and not a NAD integrated.

At your stated budget, the more upmarket PSB Image B6 is more appropriate, with wider dynamics and deeper bass extension. There are rave reviews everywhere including this one from Stereophile. The measurements indicate a -5dB point at 40 Hz.

Or look for a used pair of Dynaudios at your budget. They're well known for good bass extension from a small monitor.

I highly recommend the B&W 685. For $500, I don't think you can bet a better bang for your bucks with these speakers.

QN