Bought two sets of these and installed them in my car only to find that having the rear speakers playing along with my front speakers creates a huge dip in my frequency response around 2.5kHz that I can't seem to remedy with my HU's limited EQ and T/A. Given they added very little in terms of increased output up front, I opted to unhook them and just now (few weeks ago) got around to removing them from my car. They were installed a year ago and only allowed to produce output for a couple of months before I unhooked them.

Bought them from Crutchfield last year for $70 each, price is firm at $35. They are back in the packagng with the screws, (unused) wiring, manual, grills, everything except the plastic bags they were once packaged inside. Look around, they get good reviews pretty much everywhere.

http://www.crutchfield.com/S-1ikdzNVQ7ZN/p_2064CS654/Kicker-40CS654.html

Interested parties may contact me via the in-site messaging system

Guaranteed to be in perfect working order. However, I have no real desire to wire them back up for sampling, but I have a matching set in my car already that could be sampled, if desired.

"Upgrade bug bit and I have now removed the matching front set to put in components and run active. Old set from the front doors are being given to my sister."