Does anyone know specs (input voltage, impedance etc) on stock>> Infinity amplifier in Durango 99? I'm thinking about replacing the>> stock radio, but will probably leave amplifier in place.>>

The Infinity amp accepts speaker-level inputs from the head unit,>> and it puts out about 12 watts RMS per channel at a somewhat>> reasonable distortion level (take that with a grain of salt). It's>> rated at 160 watts, but that's peak power at something like 8% THD.>> The only good thing about the Infinity amp is that it's got>> pre-programmed equalization to make the Infinity speakers sound>> "good" (relative term).>>

Chances are pretty good that any decent aftermarket head unit will>> have more power than the Infinity, so it may be better to simply>> bypass the Infinity and go directly from your new head to the>> speakers. Of course, your best bet is to replace both the head>> unit and the speakers.>

Thanks! I've already replaced rear & front speakers with Kenwood>> 17cm ones (Infinity speakers were blown), but left stock tweeters in>> place.>

Would you recommend tossing the amplifier and get a decently powered>> head unit? Or maybe get a head unit with no amp, and re-use Infinity>> amp? Can it be tricked into accepting line-out instead of speaker>> level inputs?

So you're using the OEM wiring with the "integrated" crossover for>> the fronts?>

Considering you've already upgraded the speakers, you might want to>> get a decent head unit and bypass the Infinity amp altogether. >> This will give you more power to the speakers, but you'll have to>> run new wiring directly from your new head unit to the speakers. >> You'll also have to get a crossover for the front tweeters, as the>> OEM crossovers are buried somewhere in the factory wiring. OTOH,>> you can always tap into the factory wiring after the Infinity>> output, which would enable you to use the factory crossovers for>> the tweeters. >

I doubt you can feed the Infinity a line level signal, as it was>> designed to accept speaker outputs from the OEM radio. If you>> really want to stay with the Infinity, you can probably just run>> the speaker leads from the new head unit right into the Infinity. >> There's no guarantee, however, that you won't overload the Infinity>> input stage due to the aftermarket head unit's higher power.>