Monsoon Speakers

[banana]

Im looking to swap out my factory deck on my 07 Hummer H3x for an aftermarket in dash dvd navi system. My question is will the factory sub in the rear still work or will i need a seperate amp to power it now that the factory deck is gone?? Any thoughts would be helpful

[sattv]

I have one gmos-04 interface if you need it 50.00 plus shipping

[banana]

So without this interface my rear sub will not work on an aftermarket?

[sattv]

you will need an interface to keep stock items like onstar sat and chimes

[banana]

Thanks for your answers..
Generally installer put this on when they install aftermarket units no?