hi,

i recently bought a 4 channel amplifer that can set to 2 channel or briged. i was wondering how do you connect it to the speakers(front,rear). the speakers are already wired to the dash player, how would I wire this? do I extend the factory speaker wires to plug them in to the amplifier?

I have Channel A and B input also a output, if that would help.

thank you so much

 

If you want to power all the existing factory speakers, and IF your amp will accept speaker level inputs then yes you could cut the factory wiring and feed (extend) the resulting 8 wires from the headunit to the speaker level inputs of the amp. Then you would feed wires from the speaker outputs to the speaker side of the wires you cut. You would set the amp to 4 channel mode.

 

You have a couple of options here.
If you are using the stock radio and the amp has speaker inputs (sometimes referred to as hi-inputs), then you would need to extend the speaker wires from the radio to the amplifier's speaker inputs. From there, you would run the output from the amp to the speakers.
If you are using the stock radio and the amplifier does NOT have speaker inputs, then you will need to convert the output of the radio from speaker wire to RCA. This is done with a Line Output Converter, or LOC for short. They are readily available at stereo shops and online and usually cost around $20. You will need to accommodate for 4 channels rather than two, so you will probably need to get two LOC sets rather than just one unless you can find one that is made for a 4-channel setup.
LOCs are very easy to install. All you need to do is wire up the speaker wires from the radio to the corresponding input wires on the LOC (i.e., right positive from radio to right positive of LOC, right negative from radio to right negative of LOC and so on). From there, all you have to do is connect your RCA cables from the LOC to the amplifier. Some LOCs have an extra wire for a ground, but it is not absolutely necessary unless you are getting signal noise. Keeping the LOCs installed close to the radio will keep you from having to splice extra wire between the radio and LOCs.
If you have an aftermarket radio/HU that has multiple RCA outs on the back, all you need to do is connect the RCAs between the HU and the amplifier.
Set the amplifier to 4-channel so you can control your balance and fade from the radio/HU. Otherwise, you will have to adjust the gains at the amplifier to set your fade accordingly.
If you have any questions, feel free to ask.

 

ok heres the thing you really shouldnt bother installing a 4 channel amp to factory speakers - im not positive but i doubt that there rated for a decent amount of power/watts - upgrade to aftermarket speakers and run new cable (from speakers straight to amp) 16ga should work - then extend the head unit speaker outputs to signal the amp via high level inputs - and bam your done

again if i were you i would upgrade to aftermarket speakers

 

all of my speakers are aftermarket, but unfortunately my aftermarket head unit only have 1 output. so i guess i need to extend the aftermarket speaker wires to the amplifier.

 

no , you need to buy another BETTER aftermarket deck.

by far the easiest and best audio quality way of going about this problem

 

you could use a speaker level adaptor that would convert the fronts to rca level and then use the rcas on the deck (assuming they are rears) and run that all back to the amp. Then run 4 sets of speaker wires to the radio. Cut the speaker wires coming off the radio and tape them up. Wire in the wires from the amp to the speaker wires left over at the radio. Those will be white, grey, green, purple and their black stripes