I would like to ask help regarding the subwoofer I just bought. this is the model:Pioneer TS-W307D2: Dual-Voice Coil Design, 2 ohm, 400W nominal, 1200w max My Head Unit is Pioneer DEH-6950IB which states in the manual that speakers lower that 4ohms must not be connected to this Head Unit.I have an amplifier of 600W...model is Pioneer GM-6300F60 Watts x 4, at 4 ohms