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View Full Version : looking at the free box plans and have a question



mat3833
09-22-2012, 03:13 PM
ok so i have these 2 10" subs from an old pioneer bookshelf speaker. the encosures they came in are trashed but the subs themseves still work for being 15-20 years old. so im going to build a box for them and use them in my HT settup.

i was looking at the 2 cubes @ 27hz box and since i cant get ANY specs on these drivers except for RMS power i dont know their displacment or anything. and ATM im lacking any buckets or anything to try and measure their displacment. my question is once i put the drivers in the box(im doubeling the box size. so it will end up at 4 cubes @27hz so to speak. or i could be wrong.....) how will their displacment adjust the tuning? if im not mistaken it will raise the tuning, which isnt that big of a deal but id like to be at 27 or 28 hz and im too lazy to try and design a box with no T/S specs or anything as simple as Xmax. right now they are in a smallish sealed box from an old project that probobly leaks and they sound decent, so i figured im getting some free wood might as well make them a box that looks nice.

all in all i think 2 cubes is a bit much for a 10 but since i want low tuning and i really cant make a generic box with no specs im going to wing it and hope for the best. hell, if anyone happens to feel like making a generic plan for 2 10s @ ~27hz with this arrangment: Imageshack - 2cubes27hz24sqin6nl.png (http://imageshack.us/f/62/2cubes27hz24sqin6nl.png/) i would love you forever. :-)

and that link is the 2 cubes at 27hz box i was looking at.

Matt

mat3833
09-23-2012, 12:33 AM
anyone? just need to know if im on the right track here. and i know that tuning so low will make the output in the higher range feel less "punchy" and i may loose some output, but thats what my little Tapped horn 6.5 sub is for.

Matt

mat3833
09-23-2012, 09:27 PM
ok so i did some WinISD modeling and since i have no idea the T/S specs i picked a random 10" woofer. for some reason when i model 2 10s in a 4 cube box tuned to 27hz my output at tuning will be -2.5 db. but unless im crazy the plans call for a total of ~41 inches of port with a 2"X12" port(since im doubeling the box i just made the port 2X24) when i model to match the port length is says my tuning is 25 hz. sigh, i guess ill just build the **** box and deal with it. might end up going with the 1.65@28 box instead.

Matt

DoesDad
09-23-2012, 09:37 PM
If you took these out of bookshelf speakers wouldn't these be woofers as compared to sub woofers?

mat3833
09-24-2012, 10:31 PM
no, they are actually subs. the bookshelfs had 2 speakers in each. one was the sub and the other was a 5 inch 2 way. i checked the built in crossover and these were crossed at ~120hz which is a bit high.

Matt

Kadori
09-26-2012, 12:28 PM
try using the re box calc RE AUDIO - Box Calculator (http://reaudio.com/box.php) just fiddle with the red numbers until you have what you want