Note: The GTO signal sense only activate when receiving signal from the ‘Left Speaker Input. 'All-in-one' Crutchfield 9-wire speaker cable makes this easier by including the wiring for four speakers and an amp. Then send the amps outputs back to the stereos harness, and on to the speakers through the factory wiring. In that case, use the ‘Left Speaker Input’ on the LC2i and out the ‘Left Bass Output’ to the amp. The best way to connect it to a factory system is to tap into the stereos speaker outputs for the amps input signal. Lastly, Some aftermarket sub amps only require a mono signal. Keep in mind, the LC2i is only a two channel input and will accept only one pair of Left/Right signal, leaving a loss of Fade control… So choose Wisely, for the true signal will bring you life, the false signal will take it from you! ![]() Ensure that the aftermarket amp has a 2 channel option for its 4 speaker outputs. Make sure the signal going to the input of the LC2i is a full range signal otherwise it will not sound right. The main output is designed to send signal to an amp for a car speaker system. The LC2i can also handle an aftermarket speaker system. The ‘Bass Output’ has a low-pass filter starting at 1kHz, and the PFM roll’s-off the low end at 33Hz. From there you would run from the ‘Bass Output’ to the bass amp. If that option is not available, tap into the channel output that provides a sub frequencies signal whether it be front or rear channels. ![]() When adding an aftermarket sub system, some head units provide a dedicated sub channel output. If your speaker has a nominal impedance of 4 ohms or lower and it requires a lot of power, so it is best to choose a 14 or 12-gauge wire, despite the distance. We recommend Harley’s dating from 98-13 to upgrade their 5.25 to 6.5 speakers. Here is a list of ways to utilize the LC2i with your factory amp: Polk Audio’s db651 provides a high quality economical option.
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