Sharing 2008 Toyota Camry Stereo Info

i recently installed a stereo in a 2008 camry.

I'm not sure if you guys already know this, but I thought that it might be helpful information.

I found that the normal toyota wires  for the rear speakers are only used for treble. for instance the rear left speaker wires are normally black positive and yellow negative. But there are 2 other wires if you look at the plug by the speaker youll see that the one that is next to the black wire is positive and the one next to the yellow wire negative. if you tap thoes wires for your high to low then you wont get the problem of not getting bass because of  using the other wires.