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I was wanting to upgrade my speakers in my 03 EX, because I think the stock ones are shizat. I want to keep the stock head unit though. Now, my question is: Would it be possible to upgrade my 4 speakers and power them with an amp while still keeping my stock HU? Here's what I'm getting:

2 Rockford Fosgate 3-way 6X9 FRC3369
2 Rockford Fosgate 3-way 6 1/2 FRC4306
Rockford Fosgate 501X 4-channel Amp

Thanks.

 
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the stock HU doesnt have preamp outputs...but you can get adaptors that you connect to the speaker wires that convert them to low-level inputs for an amp. My advice is to, instead of getting amps for your speakers, just get a new HU. It will come with a much better amp than stock, and if you later want to get even better amps, you have preamp outputs on the back of the HU.

 
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you can do it off your stock head unit with adapters like was said above. do yourself a favor and put the adapters behind the headunit..that way when you upgrade, the rcas are right there.

 
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as far as the adaptors, they will run you $25-$30 for one, which does a stereo signal. If you want to amp the front and rear separately, you'll need two; You're looking at almost $60 just for the adapters...you can get a new HU with preamps for like $100, so I don't see why you would do it this way; but hey, its your car, do what you like.

 
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Just get a new HU too lol Better sound quality, more features, and what I personally think is the most important thing: higher preout signal voltage...

 
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actually, you only need one converter. at our shop we refer to them as high-levels, but the name is irrelevant. and you only need one, no matter how many amps you are using. just have to get splitters for the rca's.

 
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but if he still wants to be able to fade back/front, then he needs 2.

 
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This has been covered many many times, please search next time!