would .5 cu. ft. be enough for JL 10w0-4?

[Jeff 10+ year member]

I currently have (2) JL 10w0-4's in a sealed box behind the seat of a reg. cab truck. I have a JBL bp600.1 on them doing 600 watts rms combined to both subs (parallel), and it is beating the fug out of them. I have .75 cu. ft. in each half of the box for a total of 1.5 after divider and sub displacement. My question is: would roughly .5 cul ft. per sub be enough if I added a third? My thinking is that if a 1.33 ohm load draws no more power than a 2 ohm load as I have it now, then three subs would take the power better than two (roughly 200 rms watts each vs. 300). Subs are rated at 125 rms each. Would this poly fill stuff help with the smaller volume? BTW, JL recommends .75 each for sealed subs, but somewhere I had heard .5 to .9. What do you guys think?

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[Jeff 10+ year member]

anyone?

 

[audiolife 5,000+ posts]

you would lose low frequency extention....... get creative and make the box a lil bigger

 

[Jeff 10+ year member]

Well, I am the one who built the box, and could make it larger, but I don't want to lose anymore leg room. I am 6'3" and this is a reg. cab truck. I thought maybe the subs would sound at least as good, while extending their life a little.

 

[audiolife 5,000+ posts]

you would lose prolly 5 to 15 hz in frequency response on the low side

 

[Jeff 10+ year member]

Would that poly fill crap work? I have never used it or known anyone who has. Supposed to slow down sound waves or something like that?

 

[audiolife 5,000+ posts]

maybe wouldnt hurt the extra cone area will help that too but its something that i dont think is figurable i think u would just have to try it..i dont know the factor in the equation the poly would give