A 2002 head unit will plug in to your car's radio harness, however, it will not work properly without re-pinning the connector. The 1994 cars had a year-specific pinout, specifically, with respect to the amplifier turn-on (pink) and steering wheel control input (dark blue) wires. I have no idea why GM did this - beginning in 1995 they changed the pinout back to the way it was in 1993.
The Monsoon head units were no different from the non-Monsoon head units other than their appearance. (There is one minor difference that depending on the part number you are looking at may be present, but nothing that changes the answer to your question.)
All four tweeters and the door midrange speakers have their own passive crossovers. Replacing these speakers will require the addition of something similar. The 2-channel amplifier behind the passenger side sail panel contains the only active crossovers in the car, and it only powers the subwoofers in the sail panels.
There's not a lot of room for a subwoofer to protrude from the opening behind the sail panel. I can't tell you exactly how much there is, but there isn't much. With the factory amplifier, there's really no need to spend money on a 6.5" subwoofer (cheaper ones run about $100 a pair and go up from there)...just purchase a 6.5" coaxial speaker with a really good low frequency response (like a Pioneer) and it will serve you just fine as a "subwoofer." The RMS of the head unit and the amplifier is in no way going to overpower anything aftermarket in the way of speakers. You'll hear the amplifier start to clip long before that happens.
I'm not sure why you are looking at replacing tweeters unless there's something wrong with yours. Those things basically last forever and they sound fine.
The Monsoon head units were no different from the non-Monsoon head units other than their appearance. (There is one minor difference that depending on the part number you are looking at may be present, but nothing that changes the answer to your question.)
All four tweeters and the door midrange speakers have their own passive crossovers. Replacing these speakers will require the addition of something similar. The 2-channel amplifier behind the passenger side sail panel contains the only active crossovers in the car, and it only powers the subwoofers in the sail panels.
There's not a lot of room for a subwoofer to protrude from the opening behind the sail panel. I can't tell you exactly how much there is, but there isn't much. With the factory amplifier, there's really no need to spend money on a 6.5" subwoofer (cheaper ones run about $100 a pair and go up from there)...just purchase a 6.5" coaxial speaker with a really good low frequency response (like a Pioneer) and it will serve you just fine as a "subwoofer." The RMS of the head unit and the amplifier is in no way going to overpower anything aftermarket in the way of speakers. You'll hear the amplifier start to clip long before that happens.
I'm not sure why you are looking at replacing tweeters unless there's something wrong with yours. Those things basically last forever and they sound fine.
