Delivering a stand-out bass response, the NV-SUBAMP200-xx subwoofer amplifier offers maximum versatility and rack-mount capability. The amplifier and optional NV-SUBIW8 passive in-wall subwoofer are designed to integrate with almost any audio system. The NV-SUBAMP200-xx features signal-sensing power activation (optional setting) to automatically turn on when it detects a signal from the receiver. It will return to standby automatically after approximately 15 minutes of no signal. Unfiltered LFE / RCA stereo inputs let you easily connect the amplifier to most modern receivers. The variable crossover and phase controls allow you to match the Subwoofer output with the main speakers for premium performance and sound. 12VDC Input and output triggers allow external devices to control the amplifier or for it to control external items. A three-position EQ switch allows the amplifier output to be tailored to any Nuvo in-ceiling or in-wall passive subwoofers. One or two NV-SUBIW8 subwoofers may be used with one NV-SUBAMP200-xx.