Bose system subwoofer add on?

Mr.Smith1983

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Mazda CX 7 Grand Touring 2007
I've got an 07 Cx-7 grand touring and I found where the amplifier for the bose speakers in the rear is. I'm curious if I should attempt to splice into the bose lines to add subwoofers without the installation of a separate amp. I'm just not sure if the amp is powerful enough for the subs. Or which lines to splice into. I found a diagram but I'm not sure that it's the right one. If anyone has any input I would appreciate it greatly.
 
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