melvimbe
FRF Addict
I have not had issues with the sub sliding around, when the seat is down it nice and snug. Even if they biamped it to run the sub it wouldnt seem like enough power for me for a 10"
The forza is 85W per channel, with channels 7/8 bridged for 250W available for a sub. Your 8.9 is 35W per channel, bridging channels for 130W...not enough for a sub.
I think your amp might be more properly sized though. IIf I understand properly, you've got 35W to the tweeters, 130W for the front doors, 35W for the rears. Then you can power the sub(s) with whatever sub you want. With the forza you have 85W each for tweeter and door, 250W for sub. If you want more for sub you're wasting what the amp can do.