A real subsonic woofer

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Hayden

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Joined 2004
nickskitz.com
#1
Hi guys
I wanted to make a real subsonic woofer for home something that you can’t really hear, for vibration only. I live in Australia and wanted to make it out of very cheap car subs like the jaycar venoms is there any other subs like that? The reason I like the venoms because I have a 10” and the sq is not bad for the price and I can’t kill it with my amp I have driven it in till the dust cap is hot but no burning smell yet I like them (cheap I know) would sq matter at low frequencies?
 
#3
i saw a tutorial awhile back on the net that showed how to make your own tactile transducer (thats what Cal posted a link to). you basically take a driver, remove the cone, affix a lead or metal bar to the frame and to the voice-coil, and then do a few other things, and you have something that just vibrates, rather than makes sound. its a bit more complex than that, but im sure with a bit of searching you could find the article.
 
#4
cowanrg said:
i saw a tutorial awhile back on the net that showed how to make your own tactile transducer (thats what Cal posted a link to). you basically take a driver, remove the cone, affix a lead or metal bar to the frame and to the voice-coil, and then do a few other things, and you have something that just vibrates, rather than makes sound. its a bit more complex than that, but im sure with a bit of searching you could find the article.
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Yeh, it sounds like maybe that's what he wants. I've done this - for my mate's "bassment", we modded some cheap 7" drivers I had. Removed cone, added block of MDF with epoxy, then glued that to a quite thin steel bar, then the bar was attached to a block of MDF and the MDF was screwed into the floorboards. It works fairly well 😉

We used six with the coils wired in series-parallel, and fed it not that much power from a LM3886.
 
#7
I thought of the bass shakers some need special amps to run them, which ones don’t?
If I use cheap subs would sound quality matter at very low frequencies?
I have half of what I want I have a 10” and a 12” that’s shakes the place vibrates the roller door some 7 meters away that’s what I want but in a larger scale I can hold a sheet of paper a fair distance from them and it vibrates. If I stand next to the subs I feel it go through my body that’s nice.

I dont know if the bass shakers will do that?
 
#8
Hayden said:
I thought of the bass shakers some need special amps to run them, which ones don’t?
If I use cheap subs would sound quality matter at very low frequencies?
I have half of what I want I have a 10” and a 12” that’s shakes the place vibrates the roller door some 7 meters away that’s what I want but in a larger scale I can hold a sheet of paper a fair distance from them and it vibrates. If I stand next to the subs I feel it go through my body that’s nice.

I dont know if the bass shakers will do that?
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Hi, no bass shakers won't move air like that, they just vibrate the floor or a chair very intensely. You need lots of power and displacement to feel each bass note slapping your torso and tickling your clothes and ears.

Why don't you just build more, say 4, subs using cheap 12" drivers into ported boxes and feed each one plenty of power? That will make a lot of noise.

Please be careful not to damage your hearing though. If it hurts, turn it down.

I would say the biggest factor for quality of low bass is the integration with the rest. Our ears are very insensitive to low bass, and if you play a sub by itelf it *will* sound cr ap.
 
#9
SimontY said:

Why don't you just build more, say 4, subs using cheap 12" drivers into ported boxes and feed each one plenty of power? That will make a lot of noise.
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That’s what I’m research on doing is to make a 3 or 4 sub probably 12” in 1 small box

I was wondering about what “style” of sub is better the clarion sw12x or the clarion pa12-s the pa12-s has a longer throw because of its surround etc… but the sw12x has a bigger cone area because of its small surround, both 600w. Witch will pound/vibrate the place harder at low frequencies?

Basically: long throw and small cone vs large cone and smaller throw
🙂
 
#10
Hayden said:

That’s what I’m research on doing is to make a 3 or 4 sub probably 12” in 1 small box

I was wondering about what “style” of sub is better the clarion sw12x or the clarion pa12-s the pa12-s has a longer throw because of its surround etc… but the sw12x has a bigger cone area because of its small surround, both 600w. Witch will pound/vibrate the place harder at low frequencies?

Basically: long throw and small cone vs large cone and smaller throw
🙂
Click to expand...

Hi, the answer is probably whichever driver has greater volume displacement. This is surface area (S^d) multiplied by xmax (or xmech). This is assuming you have enough power to drive the drivers in the enclosure to their excursion limits.

The smaller the box the more power you can feed it and the more humped and one-note the response will be.

What kind of a sound are you after? (apart from LOUD 😀 )
 
#11
I’m a mad bass freak, its going to be for my computer I was after something to shake the place when playing games, DVD, music and wow factor for my friends, I don’t want it to be distorted un controllably but it doesn’t have to sound good just low end bass

Btw I’m blown away on how much bass I can get out of a 12” and a 10” sub running at 60w rms its crazy I can knock the side off my computer case, vibrated a draw out of my stationary box, I can throw a AA battery 3 cm in the air on the computer table I’ve even vibrated the 3.5mm line out plug on my sound card out of its socket lol it took a while to figure that one out I though I’d blown the amp or something😀
 
#14
A shaker would be nice but I don’t think I want it to vibrate whatever it touches I want it to vibrate things through sound waves like (subs) no so much vibration like shakers
I want something like those massive car audio systems that the wind makes your hair stand up they vibrate the whole place but obviously on a smaller scale

btw home made shakers would you have to recoil it so it does'nt burn out?
 
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