I have 2 -12" skar woofers with 1200 watt monoblock amplifier .,after playing music for 10-15 mins amp goes in to protect mode..when wiring subs for a 1ohm load .do I have to use all 4 speaker terminals at the mono amp or do I just connect both positives and both negatives from both speakers and go to just 1 positive and negative on the amp?