Giant Subwoofer?

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#224
The Alliance 18 may model similar to the Avalanche, but it does not use any special low distortion motor technology like the Avalanche. Here are some parameters of the Avalanche 18:

Qes - 0.429
Qms - 6.0
Qts - 0.4
Fs - 16.1hz
Vas - 550 liters
Mms - 369 grams
Re - 3.2 ohm
Le - 2.4 mH
Xmax - 27mm

Dual 2ohm voice coils, treated paper cone, carbon fiber dust cap, foam surround, I believe a 3" voice coil (not 100% sure), thermal handling of 800 watts RMS, and XBL^2 technology. It weighs in at just under 50lbs. Here are a couple pictures of my two Avalanches that are waiting in the wings 😀

An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.
 
#225
😀 😀 😀

Wow!

That compact disc in the center really gives the scale.

Can this still be bought? How much power can it take?

Do you have a www link for that driver?


How do you think this compares to the 21" in one of the SonoTube examples given earlier?

How about the hemp 25"

How about other 18"ers?
 
#229
zenmasterbrian said:
😀 😀 😀

Wow!

That compact disc in the center really gives the scale.

Can this still be bought? How much power can it take?
Click to expand...


Yes.

I get mine at BESTBUY ($15 for fifty)

VERBATUM is a good brand these days.

But be careful -- quality changes week to week.

For example, FUJI used to be good -- now they are cr@p

You really have to do your homework.

Oh! I'm sorry. I forgot. You have no clue what that means...
 
#233
Steve, don't worry. We are going to do just like you said. When we think we've really found something, we are going to invite you back to show us how to do it even better.

The whole purpose of this thread is so we can put up something that you can show us how to improve upon, and how to save dough.

😀
 
#235
zenmasterbrian said:
The whole purpose of this thread is so we can put up something that you can show us how to improve upon, and how to save dough.
😀
Click to expand...

Cmon Zen -- be honest.

The real purpose of this thread is to jack the rest of us around.

Most (if not all) of the questions you pose can be answered simply by using the SEARCH key.

Dude, you really need to stop being so L-A-Z-Y ...
 
#237
I want to get this back on topic by summarizing the drivers that we have already looked at.

Then we can start comparing them in greater detail, as well as looking for more.

Then, Steve has offered to show us how to do it right, which given what he has already built, I know will be worthwhile.

We've talked of the Avalanche 18" that Steve used.
http://www.diyaudio.com/forums/showthread.php?postid=957823#post957823

We've talked of the Ascendant Audio 18", a new one
http://ascendantaudio.com/allliance_page.html

We seen a 21" used in a SonoTube design, from the MCM catalog.
I've seen this in the MCM catalog myself. Not sure who makes it, or if it is still available.
http://www.diyaudio.com/forums/showthread.php?postid=969080#post969080
looks like fs = 25hz

We've seen a 25" from Hemp audio.
http://www.hempacoustics.com/products.php

These listed so far seem the most available and the most practical.


We have also seen some very large ones. Not sure about availability or pricing on most of these. Seem to be 800mm or 32"

Mitsubishi / Diatone

Clarion ( $2900US ?)

Fostex
http://www.diyaudio.com/forums/showthread.php?postid=955440#post955440

And then mention of a 60" from Mitsubishi.

There also may be some large drivers from MTX.

Then there was also the fan speaker, and something else with paddles.

Then there was the belt driven speaker with a rotating servo motor.
http://www.servodrive.com/basstech7.html
 
#238
Just to follow up the above post:

We have this, which might be the 21" in the MCM catalog?
http://profesional.beyma.com/ENGLISH/detalle.php?id=13

We also have this 24", with fs = 25 hz
http://www.papl.co.uk/Search.asp?types=yes&type=24

Here is the Clarion. Not sure of availability. Certainly seems pricey. fs = 17hz. But often talked about as being able to go down to 5hz?
http://www.diyaudio.com/forums/showthread.php?postid=992697#post992697

We have here a source for some drivers, and much more
http://www.wilmslow-audio.co.uk/
Could be $3900US for the Fostex 800mm. But need the paper catalog to see this.

Here are the Mitsubishi Diatones
http://www.diyaudio.com/forums/showthread.php?postid=993662#post993662

Here is Steve's offer
http://www.diyaudio.com/forums/showthread.php?postid=995155#post995155

Here is a most interesting article which talks about going down to 8hz for the 64' organ rank
http://www.pykett.org.uk/vlf_repro.htm

From this post
http://www.diyaudio.com/forums/showthread.php?postid=995704#post995704

For fan subwoofer
http://www.sonicflare.com/archives/eminent-tech-trw-17-the-most-powerful-subwoofer-in-the-world.php
 
#239
Here are Steve's awesome pictures:
http://www.diyaudio.com/forums/showthread.php?postid=1001215#post1001215



For the belt driven speaker with a rotating servo motor.
http://www.servodrive.com/basstech7.html

http://www.servodrive.com/Download_files/Contrabass/ContraBass.pdf

Here is something which should talk about building metal sheilding into sub cabinets, magnetic shielding.
http://www.htguide.com/forum/showthread.php4?t=16774

Here is an interesting post
http://www.diyaudio.com/forums/showthread.php?postid=972810#post972810

Which mentions this 22" MTX driver which can take 12,000 watts and weighs 369 lbs. I don't know what to make of this. I don't think this is readily available. Can't imagine the cost. I believe this is for car competitions, and meant to go very loud, but not to low frequency.
http://www.mtx.com/caraudio/products/subwoofers/jackHammer.cfm

This seems to have JBL drivers up to 18"
http://www.jblpro.com/FullLineCat/Portable C.pdf

There is also mention of WinISD, as design program.
 
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