imports only

Hi all,
It's been a while since iv'e posted but I have a new Audi and need some help. It's a 2003 A4 with the BOSE Symphony Radio. All I want to add to the radio is some subs in the rear. I know you can get a device to change the hi output at speaker to rca's but in my experience this has never been as good as real rca's. Questions are as follows:
1.Can I just (solder) splice in some leads at input to Bose Amp?
2.Is the Bose amp in the rear trunk?
3.Which wires or pins on connector are actually rcas at input to Bose amp?
Iv'e searched but all I found was the device to tap into high output at speakers.
Thanks in Advance, Noel

MacSub

<center><img src="http://img.photobucket.com/albums/v700/dizzythedog/B6-B7bose_amp_pinout_25pin.jpg"></center><p>

slbowman

http://www.a4mods.com/#index.php?page=webcontent/pages/stereo.html

MacSub

That's got front speaker connections on it, the non Bose system doesn't have them