Please Help! Aftermarket sub very quiet when using Shaker Pro signal - Ford Mustang Forum
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post #1 of 3 (permalink) Old 06-23-2019 Thread Starter
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Please Help! Aftermarket sub very quiet when using Shaker Pro signal

I spent a day replacing the crappy stock subwoofer and amp in my 2013 GTCS. See candersen's post for an idea of how I did it. I added a 500 watt RMS amp and matched sub to the existing Shaker Pro sub box. I ran new 4 guage cable for battery and ground, and I tapped into the existing signal coming into the trunk. To do this, I spliced in an RCA (composite) cable by attaching both right and left + and - to the single + and - signal coming from the head unit to the factory amp. It is somewhat louder than before but nowhere near the thump of a 500 watt sub. Is the signal coming from the stock head unit extremely tame? What can I add to crank the bass back up? I've looked at doing the head unit but I have Sync with nav and my options are limited. Thanks!

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post #2 of 3 (permalink) Old 06-23-2019
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Make sure your amp is set for low level input, not high level, and on the RCA the center post is + and the outer is - . If you mix them up the polarity is reversed and sound level will suffer. To increase the volume from the sub, turn the level up, and if it has a decibel boost that can increase the punch substantially. If your amp has a crossover make sure it is off as the only signal coming from the stock head unit is a low pass signal. These are just the normal things to check first. If you still have issues feel free to PM me.

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post #3 of 3 (permalink) Old 06-24-2019
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Most subwoofer amps have adjustment knobs on them (usually reachable by a small flat head). Sounds like yours needs some adjustment. They usually come factory set pretty tame.

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