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The Quantum: QPX2000.1M, QPX2500.1D, QPX3000.1D, QPX4000.1D and QPX5000.1D are equipped with a built in variable low pass crossover network allowing you to select the crossover function and frequency for each the front channels or rear channels of the amplifier independently.

Save on Quantum Audio QPX2500.1D (2500 WATT) Car Amplifier 1 Ohm Mono Block with a eBay promo code

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