As already posted my power amplifier has turned into a fog machine. As transition time I now take an older Audison LR 3041 2-channel. However, I want to know which power amplifier gets the best out of my Rockford box!!! Description of the box: Rockford Fosgate USA BTR 2122 Rockerbox Dimensions of 85 x 30 cm 2 x 400 Watt 2 x 250mm Z-Power RF USA original. Woofer MOTOROLA USA SPL Studio P.A. Hochtonhörnern 2 x 3″ Bassport, 2x2Terminal as well as P.A. Neutrik Speakon Terminal for conection 2002 It would be very nice if you could help me further and maybe share some data and experiences about this box. Price class of the final stage should not go into the 4 digit range