[fdiprete]

Update -

I haven't replaced the seat "subs" yet but lowered all freqs 60hz and below and I am just using them to augment the 4" drivers for bass. At least the seat subs are not making protest noises. (one is weaker than the other). I still plan to replace them. After hitting them with a puny 45 watts and lower frequencies they stand out as the weak link.

I decided to install my Infinity Basslink in the trunk (left over from my e36) and it helps. The crossover on the basslink is at the default. No point in filling the trunk with 100+ hz bass I can't hear.

Current Setup:

From the [STOCK HU] :

Front Out --Y-> [EQS FRONT IN] - [EQS FRONT OUT] -> [Alpine 3527V chan1/2] -> Door Speakers
Front Out --Y-> [EQS SUB IN] - [EQS SUB OUT] -> [Alpine MRP T306 chan1/2] -> Seat Subs

Rear Out --Y-> [EQS REAR IN] - [EQS REAR OUT] -> [Alpine 3527V chan3/4] -> Deck Speakers
Rear Out --Y-> [BASSLINK IN]