stock system and high level input questions

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TT061880
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Here is the situation.

I have a IS350 with Mark Levinson audio system that come with a built-in amp(http://www.marklevinsonlexus.com/overview.asp?model=is). I hooked a 500/1 & 10w7(ported box built by JL specs) last night but it sounds like the midbass or something is missing, it's loud but it doesn't sound right. I get the audio signal from the stock subwoofer and input that into the HL input on the 500/1.

This is what I have in mind to gather the rest of the missing signal. I'm planning to tap into the wires from all the midrange speakers and woofer speakers and sum them all up into two RCA cable.

here are my questions

1. Please look at the link and tell me which speakers I need to tap the wires, there are a total of 14 speakers. I know I definately don't need to tap onto the tweeter:).

2. If I tap the wires onto the speaker wires, will the speakers lose a significant amount of audio or anything?

3. On the RCA cable, there is an outter ring and there's also a male pin in the center. Which one is negative and which one is positive.

I'm a newbie to car audio and I tried to do a lot of researchs before I post this so please forgive my ignorant if any of the above questions is stupid //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif. Thank you in advance for your help

TT

 
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