ok, I have a bit of a delima.

I have a 10" JL sub rated Rms 150w @ 4 Ohms and a 300W class D Mono Block Kicker amp rated 150w Rms @ 4 Ohms or 300W @ 2 Ohms.

My problem is I don't really want to have to cut away at the back dash. Will a 10" sub fit by just stacking a 10" MDF ring on the rear dash? If not, what other options do I have?

My only other idea to solve my problem is by just getting a 8" sub. If I do that, I'm looking at getting the Kicker CompS 8" Single-Voice-Coil Subwoofer rated 200w Rms @ 4 ohms or Kicker CompR 8" Dual-Voice-Coil Subwoofer rated 400w @ 2 ohms.

What would be my best option for dropping a new sub into the rear dash using the Kicker 300.1 Class D Mono Block amp?

BTW, my car is a 90 LS400 and the stock sub is an 8" sub.

 

Your only option if you don't want it to sound like a loud distorted headset is to go with an 8" JL Audio free air woofer, you can't just drop a kicker in ace of the stock one even if it's the same size, too heavy and not the toe of air space that's required for that speaker

 

Just how would the Kicker sub be to heavy?

btw, I think I figured out what I'm going to do about my sub. I'm going to temperaly use a box for my 10" JL sub and modify the rear dash. I didn't want to do that but it looks like I have to.