Subharmonics

[IH8PunkRok]

so i need to make some major vibrations from a sub and i figured subharmonics would be a good way to do so. however i cant quite get wut im lookin for.

basically wut i want is a synthetic 15 or so hertz. because the sub i have (little 10 inch from wally world) cant reporduce 15 hz very well..

am i on the right path to makin more vibrations or am i barking up the wrong tree?

oh this is for a physics project. i need this sub to make alot of vibrations to shake something loose

[tejcurrent]

If you google and download audacity you can create sine waves. Realm Of Excursion has a download section where you might find one.

Not sure if that answers your questions. Are you trying to build an enclosure to help it do this or free air or what?

[HHR Ed]

would be easier to use a larger diameter driver like a 15", 18", or 21" sub.

You would need to build a large sealed enclosure and use an amplifier without a subsonic filter.

You can use a tone generator or even a test CD with recorded test tones in that range.

[IH8PunkRok]

well here is the deal

the sub, amp and box are kinda set in stone. so none of that can be changed. its a 1.5 or so cube enclosure. not sure on tuning tho. (bought it at a yard sale)

i have audacity and i have been messin wit different frequencies

[aznboi3644]

well if the enclosure can't be changed than you are shit out of luck...

[Forevrbumpn]

I was going to mention, what you can do is get 2 subs, and 2 boxes, and tuned them about 7.5 hz or 15 hz ( I forget which ) separate from each other to make 15hz

without strain on a sub actually producing 15hz

should be like 1 box at 30hz, and the other 45hz, playing same tone