Actually, the 770 will handle seven maggies without a problem. Maggies are harder to drive than the M80's. I know you have a defective unit. The key to quicker service is to exaggerate the problem. For example: "I saw a small plume of smoke come from the amp after 20 minutes of use." That will get there attention . Also try posting the problem on their (Outlaw's) message board.

M80's VP150 QS8's Earthquake SuperNova MKV-15
Integra DTR-7.4 Outlaw 755 Outlaw M200's Outlaw ICBM