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Forum: DIY Subwoofers - General Discussion   02-02-07, 12:59 PM
Replies: 53
Views: 8,592
Posted By BoomieMCT
Re: Very low budget sub.

Yeah, post #44 above has that plot. It is in a larger box but they look almost identical. Where the dark line crosses the red line is where the driver has overexcursion. As you can see it is...
Forum: DIY Subwoofers - General Discussion   02-01-07, 09:37 PM
Replies: 53
Views: 8,592
Posted By BoomieMCT
Re: Very low budget sub.

Just two would be like a higher tune. For the 4.2 cubic foot box it looks like the attached. A 6 cubic foot box is earlier. A sealed box of the same size looks like a sealed box with an F3 of 55...
Forum: DIY Subwoofers - General Discussion   02-01-07, 05:11 PM
Replies: 53
Views: 8,592
Posted By BoomieMCT
Re: Very low budget sub.

I am a moron. I was getting too hung up on the F3 and ignoring all the other stuff. Here is a 4.2 cubic foot box with three PR's with 300 grams on each (closer to what you calculated in post #34). ...
Forum: DIY Subwoofers - General Discussion   02-01-07, 04:51 PM
Replies: 53
Views: 8,592
Posted By BoomieMCT
Re: Very low budget sub.

I have heard that an aperiodic vent will give a sealed sub a bit more low end extension, but no one seems to know how to model them except with trial and error. I also doubt it would get you to the...
Forum: DIY Subwoofers - General Discussion   02-01-07, 04:41 PM
Replies: 53
Views: 8,592
Posted By BoomieMCT
Re: Very low budget sub.

Please note that I am by no means an expert here - maybe someone else can pipe up with an idea. I have built a sub...
Forum: DIY Subwoofers - General Discussion   02-01-07, 04:35 PM
Replies: 53
Views: 8,592
Posted By BoomieMCT
Re: Very low budget sub.

Here's the best I can do so far: 3 PRs, 144g in washers on each, 100L box.
Forum: DIY Subwoofers - General Discussion   02-01-07, 04:26 PM
Replies: 53
Views: 8,592
Posted By BoomieMCT
Re: Very low budget sub.

Here is what I mean. Some of these excursion problems go away by using a smaller box and/or adding a third PR. I haven't yet gotten the driver to not overexcurse below 25Hz no matter what I do (for...
Forum: DIY Subwoofers - General Discussion   02-01-07, 04:12 PM
Replies: 53
Views: 8,592
Posted By BoomieMCT
Re: Very low budget sub.

Okay, here is a first stab at this. First off, I made the input power 200 watts as that is the most RMS power the driver's voice coil can take (don't max out your amp). I used 170 liters (6 cubic...
Forum: DIY Subwoofers - General Discussion   02-01-07, 03:35 PM
Replies: 53
Views: 8,592
Posted By BoomieMCT
Re: Very low budget sub.

If you really want to keep this "very low budget" I saw somewhere that someone had made their own PR's from speaker surrounds and MDF. Apparantly it worked pretty well down to 20 Hz or so (when it...
Forum: DIY Subwoofers - General Discussion   02-01-07, 03:22 PM
Replies: 53
Views: 8,592
Posted By BoomieMCT
Re: Very low budget sub.

Well, according to the spec sheet (http://www.partsexpress.com/pdf/295-496.pdf)the stock mass is 200 grams and the maximum moving mass is 500 grams (total, I assume). So, if the tune you are trying...
Forum: DIY Subwoofers - General Discussion   02-01-07, 02:59 PM
Replies: 53
Views: 8,592
Posted By BoomieMCT
Re: Very low budget sub.

I don't know. To be honest, I always just use Unibox and let the computer crunch the numbers. Without seeing your work the only thing I can suggest is that you double check that all your units...
Forum: DIY Subwoofers - General Discussion   02-01-07, 01:50 PM
Replies: 53
Views: 8,592
Posted By BoomieMCT
Re: Very low budget sub.

No prob. diysubwoofers.org is "da bomb".
Forum: DIY Subwoofers - General Discussion   02-01-07, 01:34 PM
Replies: 53
Views: 8,592
Posted By BoomieMCT
Re: Very low budget sub.

Check out this link (http://www.diysubwoofers.org/prd/) - tuning isn't as hard as it sounds. I don't think the PR comes with washers, but the bolt is just an M5 bolt so you should be able to get...
Forum: DIY Subwoofers - General Discussion   02-01-07, 01:24 PM
Replies: 53
Views: 8,592
Posted By BoomieMCT
Re: Very low budget sub.

Instead of using a column of air as a "spring", a PR uses a column of air's equivalent mass. Each PR will have a bolt that you can remove and add washers until it is the proper weight. It is...
Forum: DIY Subwoofers - General Discussion   02-01-07, 01:11 PM
Replies: 53
Views: 8,592
Posted By BoomieMCT
Re: Very low budget sub.

Off the cuff I'd say once tuned it would sound okay. I will plug the numbers into Unibox when I get home to verify. One thing you will want to verify is whether it is best for you to have a $25...
Forum: DIY Subwoofers - General Discussion   02-01-07, 12:58 PM
Replies: 53
Views: 8,592
Posted By BoomieMCT
Re: Very low budget sub.

That 12" Dayton PR has an xmax of 10mm. I've always heard you want the volume the PR moves to be 150% - 200% what the driver moves so you'd need at least two. After that, it basically acts like a...
Forum: DIY Subwoofers - General Discussion   01-23-07, 09:52 PM
Replies: 53
Views: 8,592
Posted By BoomieMCT
Re: Very low budget sub.

You need to figure out what you really are comfortable paying and what your realistically expect (in terms of volume, extension, accuracy, etc.). Figure that out and I think we can help you better.
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