Bought this about 4 months ago to use on my MTX Thunderform with 2 10" subs. Works great!! Thunderform quit thumping, thought it was an amp problem. Bought a new Alpine amp and installed it, Thunderform still didn't work. Took Thunderform apart, a connection wire had come off of it! Long story short, I bought a brand new amp for no reason. This rockford is rated at 90x1 at 4 ohms RMS, 170x1 at 4 ohms Dynamic power. I printed out the owners manual from Rockfords website. I'd like to get $60.00 plus $10.00 shipping for this beauty. Only reason I'm selling this one instead of the Alpine is because my speakers and other amp are Alpine also. The case has a few nicks in it, amp itself works like new. You can either reply to this thread, PM me, or email me at firstname.lastname@example.org. Thanks!