i have a blowm nakamichi 400watt amp. plugged an IT series cerwin vega up to it ... played for 30 mins and then sub quit playing and amp was in protect mode. probably cost 5 bucks for the parts or soemthing. the electronics class said they dont have anyone good enough to works on amps so they gave it back to me. i almost threw it away but that doesnt mean ill sell for $2 b/c my dad is an electrican and he could prolly fix it ....... too bad he procrastinates procrastinating