box 1 is 4.0 Vb with 60 square inches of port tuned to 35hz. the F3 of this enclosure is 28hz. the box peaks at 45hz.

now, what happens to the F3 and peak of this box if the VB is increased to 5 cubes? or 6 cubes? assuming tunning and port area are same as before, of course..

im just trying to picture as best i can how my planned enclosure will perform before i start building...

First off that port is huge for a 4 ft box, when tuning to 35hz. I came up with a port length of 26.5" long and you would need an extra .92 cf of air + the 4ft of box to tune to 35hz given the info you supplied.

So for F3 and peak #s I will assume your box is 4ft NET after displacements.

i guess i didnt really word my question very well..

yes the Vb is net volume, the available air space for the sub after all displacments

what im looking for is the absolute best daily driver box for my 15's

i will be tunning to 35hz whatever box i use, and port area will be around 70 square inches (about half the surface of the sub, i know its alot but it should work extremely well)

what im wondering is how the size of the box will effect the output of the SQ, SPL, F3, and peak..

how will a 4 cube box tuned to 35 hz be different from a 6 cube box tuned to 35hz?

quote:

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Originally posted by timmi:

what im wondering is how the size of the box will effect the output of the SQ, SPL, F3, and peak..

how will a 4 cube box tuned to 35 hz be different from a 6 cube box tuned to 35hz?

thanks

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The best thing to do is get a nice box modeling program and model each size. Check the freq. response, power handling/cone excursion, group delay, etc. There are alot
of things to consider when designing a GOOD ported enclosure.

In any case, you'll be able to SEE what's going on if you model it yourself.

I also suggest dropping the port area down to 40 sq inches and 10.5" deep(34hz tuning using 6ft NET). This gives a flat response down to 40hz and a F3 of 31hz.

This setup should work well and if you want some extra output for SPL try opening up the port to 70sqin which will give you a 3.5db hump around 50hz. Or do a large 80sqin port which should net around 4.5db hump at 54hz. This is increasing the port size and leaving the length at 10.5"

Box volume was based on 6ft using 40sq in X 10.5" long and subtracting airspace when I looked at the 70 and 80 sqin ports.