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Old 17th February 2006, 11:44 AM   #11
kinser is offline kinser  Israel
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Hey,

What i mean by using a seprate amp is an amp that has no input selector, no tone contorl or anything like that-no preamp.
Just an amp itself, something like a gainclone (just an example, not enough power from a single chip for a subwoofer that size) or a monoblock amp! you could also build the BPA-200 or 300. you also have to run the subs with a filter. you could try building a low pass filter, and put it between the amp that drives the towers and the amp that drives the suboowfers!(if thats how it is at the monemt)

If u need more help u can get me on MSN or ICQ: resnikdavid@hotmail.com / 199265121

Kinser
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Old 19th February 2006, 12:01 PM   #12
chrish is offline chrish  Australia
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I do not want to sound harsh, but sticking two larger drivers in a box designed for something else is not a recipe for good sound. I suggest getting a copy of WINISD PRO http://www.linearteam.dk/default.aspx?pageid=winisdpro
and entering the parameters for the two 12" drivers you have and seeing what box will work. You may be able to modify the box you have (change volume or add ports etc) to improve the response. There are many helpful people on these forums, I am sure you will get some good suggestions and/or help.

Perhaps you can tell us the brand and model of those drivers and the dimensions of the current box.

Sorry I cant give any more help than this, I am departing in morning away for a week or so.

Good luck though!
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Old 20th February 2006, 12:23 AM   #13
simon5 is offline simon5  Canada
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You could add polyfill at a rate of 1 lb per cu.ft.

Might improve the low bass.
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Old 20th February 2006, 11:34 AM   #14
Hayden is offline Hayden  Australia
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Thanks I’ll use the program and see what it comes up with I hope WINISD PRO isn’t to complicated I haven’t designed speakers before.

Do you know what’s hilarious? When I didn’t know much about speakers a couple of years ago I had a 12” sub that one in the mdf box(in photo) filled with cloth and not making much noise it was dead. Not to long ago I pulled it apart and discovered I'd used audio canceling cloth lol now it works much better

O yes the 2 12" are clarion pa12-s here is the Specifications
Click the image to open in full size.
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Old 21st February 2006, 10:33 PM   #15
Cambo82 is offline Cambo82  Australia
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Quote:
Originally posted by kinser

You have to run the subs through a seprate amp with a low pass filter. maby get a plate ampfrom www.partsexpress.com they dont cost much.
These plate amplifiers don't happen to come in 240V do they? I notice the original poster is from Aust also.. But i'm interested in these amps too.
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Old 22nd February 2006, 01:30 AM   #16
simon5 is offline simon5  Canada
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Most of them got a 240V switch but check to be sure.

Hayden those woofers have really low Xmax and high Vas, that's not helping!

They would need large boxes to sound good IMO.
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Old 23rd February 2006, 09:36 AM   #17
Hayden is offline Hayden  Australia
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cheap

http://www.jaycar.com.au/productView...=&SUBCATID=443
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Old 23rd February 2006, 09:39 PM   #18
simon5 is offline simon5  Canada
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Yes that's a good amplfier except this problem :

Bass boost: 6dB @ 35Hz

You must design around it and it can be problematic.
If you know how to solder you could remove that.
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Old 24th February 2006, 10:38 AM   #19
e-side is offline e-side  Netherlands
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Default Re: How to tune a sub box

Quote:
Originally posted by Hayden
I’m totally new to this whole speaker design thing.
I have a setup their car subs but for home use see photo below it’s the box with the 2 12” subs in it, the box was designed for 2 10” subs but I put 2 12” in it and it sounds crap how do I tune it? Is it possible for the 2 12” to work? Do I just start adding cloth to get the box volume smaller? It’s a sealed box with no chambers.
Thanks

Click the image to open in full size.
When you put a random woofer in a random enclosure the sound will be **** most of the times.

As you can see on the specification sheet of your 12" woofers, a single woofer requires about 30 L to get down to 65 Hz in a sealed box. Two woofers would requires double the volume, about 60 L.

In your case you use 2 woofers in a way too small sealed enclosure, causing no low bass.

According to the specification sheet these woofers should be put in a ported enclosure to get decent low bass. WinISD gives a 129 L ported enclosure for two of these drivers, resulting in a F3 of 37.8 Hz.

regards

Erwin
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