I buy and sell amps from time to time and I always like to test them or see them work when I buy them and after I buy them. A lot of times I sell to friends or people locally so I don't wanna loose a friend or have people mad at me for selling them broken stuff. Here is a test I did @ 4 ohms. Traded for civic work before I got to test @ 2 ohms.
I TRIED AUDIO PIPE,HFONICS BRUTUS AND POWER BASS 1000D AND BY FAR THS AMP BEATS EM