I have a 6000watt digital amplifier & 2 DVC (2500watts each) 12" subwoofers.the bass cuts off when the volume is increased.The amplifier was recently serviced.What are the recommended methods of connection for these subwoofers to get the best response in terms of competitions & dB's.
My car normally does a dB figure of around 148-150dB.
Can it possibily go any further than that.

Audio Players & Recorders - Crown - XTi 2000 2-Channel Amplifier