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Electronics Experts,

I just joined this site today. I have questions regarding sound system electronics for the STI. I know that the STI will be getting a 90amp alternator. Does anyone know how much the car's electronics, without the stereo, is actually using from the 90amps? I guess what I'm really asking is what my limit is when adding a stereo system such that I don't need to add an auxialliary battery or change the alternator.

In addition, I also want to know if adding an amplifier to a head unit will increase the power to drive speakers in a compounding fashion. For example: If I have a 25X4 W for my head unit and add a 50X4 W amplifier, would this raise my driving power for the speakers to 75X4 W? Also, how do I properly match the output power from a head unit/amplifier to drive the speakers? Being in the upper 2/3 of the recommended RMS for the speakers enough? I'd appreciate any comments and technical explanation. :wink:

Have a good one,
Don[/b]
 

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make the RMS for the speakers and amp as close as possible, you can go above the RMS for the speakers with the AMP, just be careful not to blow the speakers.
 

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DTSTYLE said:
make the RMS for the speakers and amp as close as possible, you can go above the RMS for the speakers with the AMP, just be careful not to blow the speakers.
Hmm, I need to think about this. I'd think that you'd rather have an amp capable of more power then the speakers can handle. This way if you're looking for louder music your amp will not have to work near peak. Distortion from clipped amplitudes will lead to high DC voltages which will blow the speaker. I'd go with amps that supply more power than your speakers RMS values state. Just to be on the safe side.
 

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arellanodon said:
...If I have a 25X4 W for my head unit and add a 50X4 W amplifier, would this raise my driving power for the speakers to 75X4 W?
if the amp is rated at 50watts, then that's the most you'll get out of it. the inputs of amps are typically unamplified outputs from the headunit; i.e. they use the *preamp* output of your headunit (if it has 'em.). some/many amps can take speaker-level outputs from the headunit (the amplified output), but i *think* the external amp first downconverts the signal. my $2e-6.
 
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