JL Amp and Sub install questions

I would be most appreciative if someone could help me out with this info...^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Thanks.

Just a guess

BROWN / white stripe - subwoofer 1 -

RED / blue stripe - subwoofer 1 +

BROWN / yellow stripe - subwoofer 2 -

RED / white stripe - subwoofer 2 +

The RED / blue stripe and RED / white stripe are probobly the positive outputs because the + power wire going to the amp is red and the - ground wire going to the amp is brown...it's worth a try.

Read here: http://www.bmwtips.com/tipsntricks/tips_pages/E39%20speaker%20color%20codes%20(non-DSP).htm (the note at the bottom confirms that the info i listed above is true)

Nice.  Very nice.  Thanks, and now makes perfect sense. 

**Now**  - just a few more little questions: 

The JL 2501 amp has an input voltage selector of low and high.  Obviously, the manual says set it on low if you're using line-level inputs, and then the funny thing, high if you're using speaker level inputs but with soldered RCA plugs onto the ends.  The manual goes on to say that you can just use one input connection, left or right, but that a Y-adaptor would be recommended.

So which option would you go with?

1. Tap into both subwoofer leads (+ and - each speaker) off the factory sub amp and solder some RCA plugs onto them and hook em up to the amp, High voltage setting.

2. Tap into one subwoofer lead (one + and -), and solder an RCA plug to it then connect to amp with Y adapater, high voltage setting.

3. Use a LOC converter for both subwoofer leads to RCA on the amp, low voltage setting.

4. Use a LOC converter for one subwoofer lead to RCA on amp with Y-adaptor, low voltage setting.

I'm feeling #3 seems to be the best answer, but maybe 4 would be ok (and less work).  What would get the best signal to the amp?

Also, is me tapping into these speaker wires going to take any power away from the factory subs?  I wouldn't think so since there really isn't any resistance being added....

Thanks again.

Once I tap into these leads, before I hook up to the LOC, can I test the wires with a multi-meter?  If it's a postive speaker lead, it will show voltage, if it's negative, it won't show voltage, right?  Sorry for my ignorance as i've never tested voltage on speakers before......