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Old 25th July 2003, 03:10 PM   #1
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Default Isobarik Subwoofer

This is my first subwoofer project, I'm going to build an isobaric (or isobarik) subwoofer using these carbon drivers:

CW2145

And a 350rms plate amp:

AA0508

I have used WinISD and came up with these:

Click the image to open in full size.

I plan on making a clamshell isobaric setup in a 72Litre vented mdf box and just wondered if i'm on the right track. I like the idea of a small subwoofer and i think for it's size it should be great. But i'm allways open to advice, what about the mdf wall thickness and wadding? will 18mm do and should it be well filled or just lined with wadding?

thanks
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Old 25th July 2003, 06:08 PM   #2
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If the goal is to make a small subwoofer, then isobaric
work good provided you have ample amplifier power to offset
the loss of effeciency..

But if you have space to allow a bigger box and want
performance, then isobaric would be my last choice.

http://www.jlaudio.com/tutorials/magic/isobarik.html

My recommendation is to make two test boxes (one isobaric,
one vented, sealed, whatever you like) out of
cheap wood, perhaps plywood or particle board, 5/8" - 3/4" thick
so you can do some listening tests.....
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Old 25th July 2003, 06:49 PM   #3
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Thylantyr is right, but you have to be careful with test box because if you dont build them as well as a real box you wont give your drivers a chance to impress you. If you go for cheap materials it is the same, maybe you wont benefit from your cab...
You know it is so easy to neglect its work, I have just so many bad experiences with test boxes . be careful dude
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Old 26th July 2003, 08:47 AM   #4
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I flipped a coin and it decided i was going to build a proper box.

I went to bunnings and got the guy to cut up a sheet of 25MDF, purchased 50 X 2" woodscrews and 100 2" chipboard screws. I also grabbed some 2" pine for braces. When i got home i measured up what the guy cut and it was all over the place. Tomorrow i will buy some sandpaper for my sander and attack the sheets to try and square them up, some were 1/4" out of square


I will also take some pics so people can laugh at my shocking camera work.





Click the image to open in full size.
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Old 27th July 2003, 03:16 PM   #5
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have you considered push-push configuration?
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If it aint broke, don't fix it. If it is broke, fix it.
If you can't fix it, take it apart and see how it "worked".
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Old 27th July 2003, 04:05 PM   #6
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Default Big TL's Are Good.

I have a pair of these Bailey TL Cabinets .
If you don't mind large cabinets, these give huge low end kidney massaging bass, and without any boom or bonk.
Take a good look at Dave's TL Site for lots of info.

Eric.
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Old 27th July 2003, 09:01 PM   #7
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Why are all the aussie guys obsessed with Jaycar??? here, I'll give you a website with most of the jaycar woofers and subs, as well as lots of the Peerless and Vifa and Scan Speak drivers... and they are in Australia... and they are cheaper than Jaycar....

http://www.advanceae.com.au/
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Old 27th July 2003, 09:31 PM   #8
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lol jaycar rules,sorta

i would go peerless but its less efficient than the jaycar 12

88db vs 93

quality vs lesser quality.

passive radiator vs cheap port

probably ok though
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Old 27th July 2003, 09:34 PM   #9
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Quote:
Originally posted by Matttcattt
have you considered push-push configuration?
I have very little room available so i went for the smaller box size, The push push box has that extra space between the drivers that kind of puts me off. I'm also wondering how the heat can escape from the inner driver, wouldn't it get well hot in a push-push setup? I'm still a newbie so i most likely got it all wrong.


Quote:
Originally posted by SkinnyBoy
Why are all the aussie guys obsessed with Jaycar??? here, I'll give you a website with most of the jaycar woofers and subs, as well as lots of the Peerless and Vifa and Scan Speak drivers... and they are in Australia... and they are cheaper than Jaycar....

http://www.advanceae.com.au/
I managed to get my gear through a wholesaler, was just using Jaycars links. I noticed you posted a link to that page somewhere before just after i purchased all my gear, wished i'd seen it earlier they are about $100 cheaper than my wholesaler

oh well, we live, we learn.
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Old 27th July 2003, 10:21 PM   #10
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hehe jaycar rules, but yeah advancea has cheaper prices.
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