Line Out Converter?

[JerseyTrueBlue]

I know this isn't the most common topic so I don't expect much input but if anyone has any experience with using line out converter on the stock deck in the GT's could anyone try and explain to me how to hook one up? I know there are 3 ways to do it, hook it into your radio somehow, tap the rear speakers, or use your amps speaker level inputs. However I have no idea what to do with the speaker leve inputs, will that make my rear speakers not work? The same goes for tapping one of the rear speakers will it take power away from that one speaker? Any info on this would be very helpful, thank you.

 

[JMstang7]

I tapped into my rear speaker amps with T taps worked great and the speaker still worked like it should. Do you have the mach 460 system?