Car Stereo Harness adaptors?

[chiwawa626]

I have a 1992 lexus Ls400 with a stock Pioneer head unit. I havent opened it and checked if it has rca outs in the back (i doubt it does). Basicly i need to get an unamped signal to goto my amp in the back (for my subs). Is there some sort of adapter harness or how does that work with car stereo?

 

[rudeguy]

chances are that deck is not powered...which means you will have to rewire it (run a wire from the deck to each speaker bypassing the factory amp)

 

[chiwawa626]

All i need is a unamped signal from the deck then my amp and crossover will take care of getting the low freq for teh sub. I want to keep stock speakers anyways so i just need to get the signal that comes outa the head i guesS?

 

[rudeguy]

so you are trying to run a 4 channel amp to your factory speakers?

edit...just reread post...you should be able to get a knock down to do that for you...the only problem is that the deck might not be powered...in which case you would have to grab the wires after the factory amp...doing so will lower the ohm load though and possibly fry that factory amp...this might be one to let the pros do

 

[Spoooon]

You'll probably have to buy an amp with speaker level inputs. I thought that they made some sort of converter that will converter a speaker level signal to RCA, but I couldn't find anything like that.

 

[rudeguy]

Originally posted by: Spoooon
You'll probably have to buy an amp with speaker level inputs. I thought that they made some sort of converter that will converter a speaker level signal to RCA, but I couldn't find anything like that.

that converter is called a knockdown....and some amps have those built in...but again if there is a factory amp involved it could get messy

 

[chiwawa626]

Yeah but heres where the twist comes in, there are 4 factory speakers + 1 factory sub. Now where do i place the knockdown or lineout stepdown converter? Im guessing on the wires that goto teh factory sub? Well what if the factory crossover isnt all that great, then id be missing out on freq that i would want with my new subs...eh?

 

[rudeguy]

yeah...you really should just rewire it all...you are risking frying you whole system...otherwise try the wires going to your factory sub...but be ready to replace everything if you fry that amp

 

[Spoooon]

Originally posted by: chiwawa626
Yeah but heres where the twist comes in, there are 4 factory speakers + 1 factory sub. Now where do i place the knockdown or lineout stepdown converter? Im guessing on the wires that goto teh factory sub? Well what if the factory crossover isnt all that great, then id be missing out on freq that i would want with my new subs...eh?

Well, chances are you won't be missing anything. I thought you posted somewhere about ten inch woofers? If you were hooking up a 15 or something, then maybe it'd be a different story.

What I would do is look for an amp with speaker level inputs first, then take the speaker wire from the factory amp and hook those up. If I couldn't find an amp I was happy with, then I'd start looking for the knockdown converter or whatever.

Also, you might find a cap or inductor in line with the speaker wire to the woofer, if you do then that's probably what they used to crossover the signal from the amp to the woofer. You could just cut those out of the circuit and then a full range signal will be going to your woofers.

 

[isekii]

Well in the IS300

all I need to do is tap one of the lines from the 6x9 in the rear to get a signal going to the amp then amp to the subwoofer.
My headunit isn't powered but a seperate amp supplies power to all my speakers.

 

[3L33T32003]

Jeez just go to crutchfield.com, get the 800 number and ASK!!!!