The unit has a built in relay, when your stock stereo sends sound to the speakers, this device converts the speaker signal to RCA jacks for your amplifer and at the same time, it feeds 12 volts to your turn on of your amplifier that it takes from the power side of the amp. High level speaker signal to low level RCA Adapter Speaker Level to RCA High to Low Adapter Very compact Output level conversion High degree of separation High signal to noise ratio Suitable for hosts without low frequency (RCA) output (for example: cassette player/card player/C-D/VCD/DVD, etc.) to convert the high frequency of the speaker output to low frequency (RCA) output, which is used to connect the car power amplifier or subwoofer signal enter. specification: Color:AS showns Material:plastic Size:55*35*30（mm） Package includes: 1x High Level Speaker Signal to Low Level RCA Adapter
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