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Repair cost would exceed replacement cost. Try disconnecting all the speakers and see if it works then. Try reconnecting each speaker by itself and see if that causes the problem. Most grand am have the monsoon sound syatem...even if they aren't labeled as such. Pull the carpet in the trunk on the left (drivers) side wheel well. The monsoon amp is located over the wheel if you have a monsoon system. If you have to remove the amp then you must change the speakers out or rewire them as the monsoon system uses bi amp speakers. Most of the ga forums have extensive write ups on this system.
Unless the face of the stereo says MONSOON there is no separate amplifier. On a Non-Monsoon Delco system all four amplifiers are built into the stereo, Left front, Right front, Left rear, and Right rear. Monsoon systems do have a separate amplifier which basically boosts the output of the four regular amps in the radio. I can't imagine all four of those amplifier output chips going out at the exact same time. I would pull the stereo and check if all plugs are seated properly. If those were all securely plugged in I would (myself) inspect the inside of the unit for the cause of failure. For example all four amp chips pull power from a common point and if one chip had a severe enough short in it, this may have caused the power feed trace on a circuit board to overload (too much current going through it) and created an open which killed power to all four of them. Any good electronics repair shop worth their salt should be able to repair it if you can locate one willing to try. It may only need a circuit board trace repair and one amp chip replaced.
everything depence of system you putting in your car if u have no amplifire you connecting the speakers to radio as they marked i you putting one in, your speakers wires goes from amplifire to speakers there is no diffrent way of connection. also the diameter of your wires have to be adekwate to power u going to have in your system for optimizing the sound quality let me know if this help ya
You have to test them, either should work fine (as in use either pair) if that doesn't work connect one pair at a time and listen for the difference, one pair might be for factory midrange and other for tweeter.. there are two different wiring configurations...
On the bottom of the page there is a link for product support. On the next page, type "2005 Grand Prix" in the search box and hit enter. The top link shows an image and pinout on models with Monsoon sound systems, the second link for ones without.