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50-250Hz Low Pass (Model DX500.1 / 1000.1 /2000.1). G. Remote Level Control: (Model DX500.1 / 1000.1 /2000.1 ) Attenuates Gain set on the amplifier by up to -12dB. H. Speaker Connections: Follow correct polarity, and do not Ground any speaker wires. Do not connect any speaker wires together. I. Pass Thru Outputs: The Pass-Thru provides a convenient source for daisy-chaining an additional amplifier without running an extra set of RCA cables from the front of the vehicle to the rear amplifier l