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Budget sub build - looking for driver/plan recs!

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bindiva View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bindiva Quote  Post ReplyReply Direct Link To This Post Topic: Budget sub build - looking for driver/plan recs!
    Posted: 23 March 2024 at 3:15am
Hiya, I've been putting together a (very) budget soundsytem for a while, mainly from second-hand speakers...

I recently came into possession of a lot of grade 3 (suitable for load bearing/humid conditions) OSB and am looking to build a first pair of subs.

I don't have many requirements as to sound - I already have kicks so looking for something that can go a little lower. :]

Higher SPL is priority up to a point as I'm looking to fill rooms of up to 100 people.
I have a very low budget for the speaker drivers - I'm looking to spend maximum £100 each and getting the best possible efficiency / performance out of them.

Would appreciate any matching driver suggestions also! Ideally ones that will work with the kam kca1200 amp I have [ 2 x 600W max / 2 x 300W RMS @ 4 Ohms ] I know that it will be a big limitation but its what i'm working with for now.

I only have a jigsaw and limited experience so a speaker plan with no angled cuts would be preferred - I've been curious about paraflex for this reason. I could probably find access if needed to a circular saw / other cutting tools however so would still be interested in more complex suggestions.

Also looking for general first time build / working with osb / soundsystem on a budget tips!

Thank you for any advice / thoughts!
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Young Croc
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Post Options Post Options   Thanks (1) Thanks(1)   Quote Contour Quote  Post ReplyReply Direct Link To This Post Posted: 23 March 2024 at 7:05am
I would buy second hand drivers, 15” or 18” from a well respected brand. 
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bindiva View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bindiva Quote  Post ReplyReply Direct Link To This Post Posted: 23 March 2024 at 12:09pm
Ty ! Do u have any advice for picking a driver to suit a box?
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Post Options Post Options   Thanks (1) Thanks(1)   Quote Timebomb Quote  Post ReplyReply Direct Link To This Post Posted: 23 March 2024 at 7:41pm
OSB and a jigsaw is not really a recipe for good joints,  i would say look out for a 2nd hand track saw, you will get a much straighter cut even with a cheapo Aldi / Lidl track saw, should be able to find one for not a lot.    

OSB is not very durable and is hard to glue as the surface is not completely flat, but if its free then i would say go for it.

If you want the max output from the minimum input power and you have free materials then i would say build some folded horns, mitred cuts are not that hard with a track saw.  It really depends on what you can find 2nd hand but you should be able to find something like 4 Fane Colossus SB 18s for about £100 each.  That amp wont fully power them but front loaded horns are very efficient and you can always upgrade the amp later.  
James Secker          facebook.com/soundgearuk
James@soundgear.co.uk               www.soundgear.co.uk
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Post Options Post Options   Thanks (1) Thanks(1)   Quote Meat Substitute Quote  Post ReplyReply Direct Link To This Post Posted: 23 March 2024 at 9:01pm
If you're short on budget and can't afford a track saw you can make a track for a standard circular saw assuming you have piece with a decent straight edge. A jigsaw is defo the wrong tool for the job, but it can be useful for doing cutouts for the drivers.

For a lot of noise on a budget I reckon you're probably looking at making THAM15s. They have a single angled cut and are fairly tolerant of a wide range of drivers.
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Post Options Post Options   Thanks (1) Thanks(1)   Quote monkeypuzzle Quote  Post ReplyReply Direct Link To This Post Posted: 23 March 2024 at 10:03pm
Totally agree regarding THAM 15, I've used quite a few different drivers in mine and they work really well. Also very easy to make.
blah blah blah blah blah......
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Post Options Post Options   Thanks (1) Thanks(1)   Quote Andry Quote  Post ReplyReply Direct Link To This Post Posted: 25 March 2024 at 3:50pm
I second to what everyone before me said - a circular saw (handheld or table mounted) for straight cuts.
For joining the pieces try using polyurethane adhesive istead of the ordinary white PVA (wood glue) .
Driverwise, a 15" would work best in this conditions. Study the 15" projects and choose the one that you feel happier with - THAM15, MTH38, CUBO15, HD15.
 
Even a bass-reflex would do it you want an even easier project, but considering the amp power that you have now, I would recommend going for the most dB-efficient cabinet type.

Matter of fact, considering a £200 budget for the drivers, you could even go with 4x 12" subs, like using the Thomann 12-280/8-W drivers in THAM12, MTH30, Cubo12 style bins.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bindiva Quote  Post ReplyReply Direct Link To This Post Posted: 27 March 2024 at 3:31am
Thank u! Yea cheapo tracksaw seems like a shout-
Do u have any advice for finding quality second hand drivers?
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bindiva View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bindiva Quote  Post ReplyReply Direct Link To This Post Posted: 27 March 2024 at 3:36am
Thank u so much for your thoughts and advice! Would u recommend the Thomann 12-280/8-W driver specifically - and for what reasons?
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