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So I didnt want to get aftermarket stereo and have a 2007 Civic EX Sedan
Obviously I cant get pre outs and have to use High Inputs.
I got an Alpine MRP-F300 4 Channel Amp
It has a built in High Input (4 channel)

I am keeping the stock speakers and got a JL 10" sub

They went and hooked it up and basically used the front head unit speaker outputs and split it into 4 channels at the amp.

If not using separate high level inputs into the amp going to distort the sound at all?

Hope this makes sense :P

 
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Uhm....
-scratches head-
What exactly are you trying to ask?

And also, Why are you using a 4chan amp on a subwoofer?

 
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front channel on amp going to all 4 speakers
rear channel mono to sub

so instead of using 2 sets of rca's because my stock deck doesnt have them they used only the front speaker 2 channel outs from the deck to the amp which they then split into 4 channels into the high input on the amp

 
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So let me get this straight,
You have 1 output RCA on stock unit, got that
You plugged in a 4 chan amp,
2 front's you used for speakers, and the 2 rears you bridged for sub?

No it shouldn't distort the sound, as long as the amp is set correctly, however, you might underpower the sub

 
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Haha- i am the worse at trying to explain this

No- no RCA's involved

The alpine amp has a 4 channel high to low converter

Is there a degradation of quality if you split 2 high channels out from the head unit (front left and right speaker wire) into 4 channels going into the amp

 
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Ah, I understand what you're saying now

Yes, there will probably be a horrible degration of audio quality
That's like attempting to split a telephone cable into 10 phones

Stock head unit's output is already low, when you try to split it more, the quality will lessen

My suggestion?
Get an aftermarket stereo, plug an amp in correctly with RCA's for your amp to reach full potential