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Description of XD 844:
A high-grade subwoofer for tighter bass response and even power output, the thundering low end produced by the XD series delivers depth with plenty of clarity. The power and feel of this series have made it the best-selling, fan-favorite subwoofer for years. This is an all-around excellent subwoofer that is certain to please most car audio fanatics.
Description of RXD-M2:
Optical Coupler Class "D" Technology. Studio-Grade Bipolar Output Stage Transistors . Now exclusively with "Professional Peak Limiter Circuitry" which guarantees distortion free musical playback at all levels.. Fully Adjustable 12dB / Octave Crossover with Differential Circuitry. Low Pass Filter: 50Hz - 250Hz. Subsonic Filter: 15Hz - 55Hz. Phase Control Switch. Full IC-Controlled Protection Circuitry. Remote Dashboard Subwoofer Control. Fully Adjustable 12dB Bass Equalizer. Mute and Delay Soft Start System. RCA Preamp Line Output. 8 Volt Preamp Circuitry.
Description of RWK41:
ThThe Rockville RWK41 4 AWG (American Wire Gauge) amp kit has the following differences over other amp kits on the market at this price point.. . . Our RCA cables are 100 % copper. These are top of the line RCA cables. . . Better Resistance: The only thing that really matters with wires is the resistance rating. This is a measurement of conductivity and how much signal is loss per foot of wire. Since Rockville wires are made with around 3 times as much copper as any other wire at this price point, these wires had a much better resistance rating which means they will transfer more power to your amps than the other brands.
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