Ok.... I got 2 JL 12W3's. They are in a sealed box of 1.25 per chamber. I have a JBL 600.1 amp running them. I have them in my 1988 S-10 Blazer. They are firing towards the ceiling. I don't have a place that measures dB anywhere nearby so I was wondering if you guys could give me a guess. I just know it gets freakin loud and makes my windows go in and out. Thanks

 

Hard to tell...I know that's not what you want to hear, but you really need to get it meterd. We could say mid 130's, and you be upset, because you might do 138. Who knows. Weather, humidity,car interior, power, amperage,etc all play an important role. So it really would be hard to tell.

Good luck and let us know!

 

I know a guy w/ a Q-logic box and 500 watt amp on 2 10 W3's hit 142.5