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How to get full range signal from stock head unit


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So I have a 2015 Honda Accord LX model with a stock stereo. I installed a 12 inch sub in a custom box with a 2000 watt mono block. I was setting my gains using a multimeter and when I played a 30 hz test tone I noticed a substantialy less value in voltage than with a 40 hz test tone. I've done my research and found out the signal from my rear speaker wire I spliced into and sent through my LOC is not a full range signal. I've read countless forums of people suggesting to Install an aftermarket head unit but I want to keep my factory one because the price to install a kit in this vehicle is almost $800. So my question is what are my other options in sending a full range signal to my subwoofer so It can play those really low 20-30hz tones. It's a 12 inch sub in a box tuned to 28 hz so It ***** not being able to get the full bass range sent to it. Thanks for any pointers I appreciate it!

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You can get a LOC with bass restoration or a bass restoration unit like the audiocontrol epicenter (results may or may not be to your satisfaction).  Also you can get a DSP such as this:

 

https://www.daytonaudio.com/product/1551/dsp-408-4x8-dsp-digital-signal-processor-for-home-and-car-audio

 

With the bluetooth module you can stream audio directly from you phone or tablet bypassing the head unit limitations.

 

Lastly knowing the details of a particular head unit other options may be available to you but will need to do a lot of research.

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