box matter

Fatii · Post by **Fatii** » Tue Jul 01, 2008 3:22 pm

Hi...
about the rsdC...
is it a huge "db" difference in spl or sq box size?
is it worth the effort build a spl box to try? +/-

/F

Post by **Bfowler** » Tue Jul 01, 2008 3:36 pm

for sealed boxes I personally have found there to been only slight DB gains to be had in a "SPL" box and only at certain frequencies.

on the other hand...the SQ boxes in my experience have always had a fairly big effect on the subs low end extension and overall smoothness

so i guess what i'm saying is...i always go for the SQ box when i have room because the SQ benefits far outweigh the small DB gains (and only at certain frequencies at that)

for ported boxes, the DB gains might be more tempting...

Fatii · Post by **Fatii** » Tue Jul 01, 2008 10:52 pm

hmm,
my curiosity tells me to try..
laziness tells me to be pleased..
ears tells me to be delighted...

if i put bricks into the box, just to try.? or will it be way to abnormal to make a accurate test?

/F

Post by **stipud** » Wed Jul 02, 2008 5:53 am

You can put anything in, as long as it takes up airspace... I personally use Styrofoam, because it is really light.

Fatii · Post by **Fatii** » Wed Jul 02, 2008 9:47 am

oki.. =) did a "googel iamge" at Styrofoam, have it at work or somthing like it.. *great successes*

Post by **stipud** » Wed Jul 02, 2008 10:09 am

On the same power a bigger box is usually louder (assuming the box offers sufficient suspension to control the woofer), since it offers less damping. With less suspension, the speaker moves more freely, so it produces more output on less power. So, if you're running at or under the RMS capability of your woofer, there is little reason to use a smaller sealed box.

The reason SPL sealed boxes are made smaller is to add more resistance to the suspension, so that you can add more power without hitting the speaker's mechanical limits. The side effect of having a smaller box is reduction of bottom end, since it is harder for the woofer to overcome the damping and hold it's extension at lower frequencies.

What you will probably notice by taking up your box space with foam, is that your bottom end is more limited. It may become muddy sounding as well, if the woofer is not strong enough to overcome the suspension at high frequencies. Sometimes too big of a box has the same effect, if the woofer's own suspension is not enough to keep it controlled.