this is the problem i think, im not 100% sure my amps 2ohm stable?
Technical Data:
Power RMS / Musik at 4 x 4Ohm at 13,8 Volt
4 x 60/120 Watt
Power RMS / Musik at 4 x 2Ohm at 13,8 Volt
4 x 100/200 Watt
Power RMS/Musik 2 x 4 Ohm bridged
2 x 180/360 Watt
it does say that on the spec, but you get better sound quality from a 4 ohm