Aftermarket Sub
 

Anyone fitted one?

At the moment i have removed the bose sub and used a line level converter to plug into my amp.

works ok.

however i would like to get a pre amp signal before the bose amp.

where is the bose amp on a d3 2004 A8? left side in trunk? yes but which unit is it?

is the unit receiving an optical signal from the MMI unit? or can i tap into the sub signal pre amplifier? ie is it a normal copper cable.

If it is optical is there any unit i can use pre amp to let me adjust/tap into the optical feed.

the reason i am asking is taht i dont think i am getting a clean signal and the low bass frequencies are really being cut off and very noticable with 2600rms

here is the box and yes my camera skills suck

https://img72.imageshack.us/img72/813/image012iu.jpg
https://img202.imageshack.us/img202/3046/image010ia.jpg
https://img231.imageshack.us/img231/1970/image008qh.jpg
https://img263.imageshack.us/img263/7176/image007uc.jpg
https://img52.imageshack.us/img52/1682/image005td.jpg
https://img519.imageshack.us/img519/4677/image004dv.jpg
https://img443.imageshack.us/img443/4011/image002lw.jpg