Warspite wrote:Please note that the factory Bose 6x9's are 2 ohm jobs...They will work, but at low volume, meaning you won't be happy with the result.
Actually the factory speakers are considered 1 ohm speakers, but to be specific, they are usually around 1.3-ish most of the time. Regardless, yes, they are way different than what is in the aftermarket.
Anyway, to the original poster, the amps are tuned specifically for the Bose speaker, so just as was said before - you will get poor results using anything other than the correct speaker due to that, as well as due to simple fitament mechanics.Simply hit your local pullapart. 89-94 Maximas, J30's, and many Bose equipped GM cars have the same 6X9 drivers.
However, before you simply assume the problem is the speaker, remove it from the system and test it independently from the car (with a home stereo). Also check impedence as well as do a smooth cone travel test.
If it is good under these conditions, your problem is the amp. If you need to replace that, make sure you use an exact match, as all equalization is built in to the amp, and is specific to the part #. In other words, every Bose amp is tuned for the car it is in and it's location in the car (front or rear). Using whatever you can find (amp wise) will result in poor performance.