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Bought a 2005 Limited PSD with Sirius Sat. Radio installed. The normal radio sounds great, when I flip the toggle switch on the dash (took me a week to figure out what this switch was for) and then hit the sat button, it comes on fine and you can hear every word, it is just muffled. I was wondering should I install amplifiers before it hooks up to the speaker. I do not know too much about electronics on cars...thats why I have you guys and gals....
I would first look at the RF modulator. If it's a transmitter, then I would buy a wired in modulator. The type that you plug the antenna wire in always sounded better to me.
Also there might be a gain control on the modulator, you could try playing with it until it clears. I believe the FCC has a limit of 4watts for all unregulated transmissions, amplifying this would be illegal and hard to find the booster to use.
A switch? I'm not sure how that would work. I have XM and it's in line with the antenna cable, if i turn the radio on i lose all reception except for the xm radio, so i can't tune as i please and leav eit on all the time, which sucks, but it does sound awesome as far as quality goes. Is it in line or a standard FM broadcaster?
FCC regulates at 1w for broadcasting, however that limit is on the initial transmitter. You can amplify it well beyond that with inline amps.
Before going that route though I'd just get the cable that connects it in line with your antenna. That way it's hardwired across the board.