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Old 14th May 2013, 01:53 AM   #1
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Smile Infra sonic subwoofer design

Dear all,

I am a newbie to this forum. I am an organist and has a virtual pipe organ set up at home . now I want to build a infrasonic subwoofer to reproduce the pedal sounds . the range of sound is around 10-20Hz.

can any one suggest a good woofer specification and enclosure design to for reaching these low frequencies .And also the amp. for powering this subwoofer.

thanks in advance,

Alex.
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Old 14th May 2013, 03:45 AM   #2
opcom is offline opcom  United States
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You should specify how loud you want it and at what frequency because that is where the $ comes in. Or goes out. Also the size of the room, as most rooms are not big enough, one needs a quite big room to support 16Hz as the wave is 62FT long? Not to mention fit the speakers in it.

a simple answer might be 1-2KW of amplifier, special ones that can go that low. at least four 18" or maybe 30" speakers. It won't perform right unless it is all designed to work together.

Really a question for an expert.
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Old 14th May 2013, 04:32 AM   #3
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diyAudio - View Profile: DjLeco already built one.
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Old 14th May 2013, 05:48 AM   #4
opcom is offline opcom  United States
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There's your expert. unfortunately no link to the work because I'd sure like to see that too.
It's here. InfraBass speaker.

Last edited by opcom; 14th May 2013 at 05:51 AM.
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Old 14th May 2013, 08:17 AM   #5
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Another possible way to go Graham Holliman Velocity Coupled Infra Bass Speaker?
There are some plans on the www.
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Old 14th May 2013, 12:26 PM   #6
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Quote:
Originally Posted by opcom View Post
You should specify how loud you want it and at what frequency because that is where the $ comes in. Or goes out.
This is true. You need to state your goals before anyone can help.

Quote:
Also the size of the room, as most rooms are not big enough, one needs a quite big room to support 16Hz as the wave is 62FT long? Not to mention fit the speakers in it.
This is not true. If it was headphones wouldn't work. You don't have to fit a whole wavelength into a room to hear it.
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Old 14th May 2013, 12:27 PM   #7
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Quote:
Originally Posted by franzm View Post
Another possible way to go Graham Holliman Velocity Coupled Infra Bass Speaker?
There are some plans on the www.
Despite it's name, that thing doesn't do any infra bass at all. It's been simulated, it's been measured, it's a waste of time.
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Old 14th May 2013, 12:31 PM   #8
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AFAIK, this is the current value leader.
Stereo Integrity | HT Subwoofers

Get a bunch of those, enough amp power to push them and use a concrete room and seal it up as airtight as possible. Never mind the neighbours complaints, they are just jealous. (Seriously though, the sound will travel for miles.)
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Old 14th May 2013, 12:56 PM   #9
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There used to be some really nice 15 inch long throw subs available from JAYCAR in Australia. They stopped selling them and I have not seen anything quite like them in Australia since. These were cheap as well - which if you want to make LOTS of bass is important, as you need LOTS of swept volume.

They were really well suited to a 200l box tuned to 19Hz, and gave really solid responce to below 20Hz. I built a lounge suite that was actually an 800l enclosure with four of these in it. At 250W into each it is absolutely hilarious.

So what am I getting to?
- You will need a really long throw woofer (irrespective of how you load it)
- It will need a very low Fs
- You will need a massive enclosure (irrespective of loading)

Options are:
- Bass Reflex - which will be prodigious in size, and probably do BAD things below resonance. Some clever EQ / protection is well warranted.
- Sealed - which will without a shadow of a doubt need a ton of EQ.
- Infinite baffle, which is a degenerate case of sealed and will need similar EQ.

If you find drivers well suited to this at a fair price, let me know.
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Old 14th May 2013, 01:08 PM   #10
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Join Date: Jan 2011
Location: wisconsin
Quote:
Originally Posted by tittualex View Post
Dear all,

I am a newbie to this forum. I am an organist and has a virtual pipe organ set up at home . now I want to build a infrasonic subwoofer to reproduce the pedal sounds . the range of sound is around 10-20Hz.

can any one suggest a good woofer specification and enclosure design to for reaching these low frequencies .And also the amp. for powering this subwoofer.

thanks in advance,

Alex.
Use a rotary subwoofer and your virtual
pipe organ will sound about as real as it
gets. I couldn't be happier with this
rotary subwoofer!!!!!
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