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RichardH

DIY cabs

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[quote name='budget bassist' timestamp='1409153161' post='2536886']
Bit of a strange question, but you didn't buy these from someone in hucknall (nottingham) did you?
[/quote]

No, they were given to me to make work then move on by a friend from local 'knees up' group called Bearfoot. I put a nasty Sica driver in one that I'd got knocking around and swapped the Celestion out for an EVM SRO / 15L. I flogged them on eBay to some young lads from up near Geordie land. The Sica sounded a bit off as it wasn't really up to the job but the EV sounded nearly (but not quite) as good as the Powercel.

I've still got the Celestion Powercel in a box for a 'rainy day' as it's a lovely old thing. The K15 was probably scrapped but gave it to the lads with the cabs anyway just in case they wanted to recone it.

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[quote name='LukeFRC' timestamp='1409552620' post='2540700']
Bill FM will possibly maybe turn up and say that they're not!
[/quote]
[quote name='Bill Fitzmaurice' timestamp='1409576359' post='2541030']
They aren't.
[/quote]

told you so!

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Hey guys! I'm really intrigued about DIY cabs at the moment, but I'm not sure which way to go with it. I've got an idea for a cab, but no previous experience of making speaker cabinets. Can't quite get my head around figuring out the maths right now, but I'm sure I'll get there! :D What I would love to achieve is a cab that sounds at least as good as my current Vanderkley 212MNT, but in an even smaller format,

The likes of Bill Fitzmaurice and Greenboy make it sound like there's no point trying to design your own cab, so I don't know if it's even worth bothering, but surely if it was as simple as working out the calculations for the optimum bass cab, surely there would be only one design which was 'the best'?

Thoughts? Are there any other good DIY resources to look at apart from Bill or fEARful? Which one is best?!

Thanks for your help people! :D

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[quote name='TRBboy' timestamp='1436049247' post='2814636']
if it was as simple as working out the calculations for the optimum bass cab, surely there would be only one design which was 'the best'?
[/quote]True, which is why it's not that simple. Every speaker is a compromise. Knowing where you can compromise and where you shouldn't is something that one only learns through experience. For every diamond I've designed there were at least four lumps of coal, which like all lumps of coal ended up as ashes.

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[quote name='Bill Fitzmaurice' timestamp='1436052996' post='2814662']
True, which is why it's not that simple. Every speaker is a compromise. Knowing where you can compromise and where you shouldn't is something that one only learns through experience. For every diamond I've designed there were at least four lumps of coal, which like all lumps of coal ended up as ashes.
[/quote]

Thanks Bill, it is all very interesting indeed! I can appreciate the time and effort that goes into the design of a cab. I guess most routes have been explored already, but in my mind there are other possibilities, although I don't have the skills to design them properly to see if the science works out! I would love to have something which sounds at least as good as my 2X12" but is a 'one-hand carry'..... Maybe I should find a custom cab design company, and send them some sketches?

Thanks for your help! :D

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Hmmm, I'd go half way with Bill. For every diamond you'll get four lumps of coal. The physics is fairly easy, as is the construction process. This is especially true since the free software packages do this for you. Anyone with A level sciences or any engineering would have no problem with that aspect.The problem is in specifying what you want and then relating that to the design. That does take experience and is as much a craft as a science, you use the science but it only walks you halfway there.

If you don't mind an experiment that might not come out as you expect then it's a real learning experience but you won't get it 'right' first time. Follow the rules and it will work, and you could get a better speaker than a commercial one at that price but you won't know what it sounds like until you plug your bass in and it is too late to back out. That suits some people but not others. Depends how you feel about coal I suppose.

You've probably spotted this [url="http://basschat.co.uk/topic/227904-1x12-cab-design-diary/"]http://basschat.co.u...b-design-diary/[/url] there's enough detail in there to build it now but I'm working on detailed plans over the next couple of weeks.

Edited by Phil Starr

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It occurs to me that while it's not unusual to come up with a functional cab as a DIY effort, trying to make something which does the job of your Vanderkley but lighter and smaller could be setting the bar rather high. It's already about as small as a 2x12" could reasonably be without sacrificing bass response, is built with lightweight plywood and uses very good drivers (Faital, I think?). A 1x12" with similar voicing might be an attainable goal though.

Edited by Beer of the Bass

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[quote name='TRBboy' timestamp='1436087450' post='2814770']
I would love to have something which sounds at least as good as my 2X12" but is a 'one-hand carry'..[/quote]Simple task, use two tens or one twelve with as much driver displacement as your 2x12. [quote]Maybe I should find a custom cab design company, and send them some sketches?
[/quote]It won't come cheap. My fee for a one-off design is $2,000 USD. That's because the average time required to come up with a fully functional design is at least 80 hours. That's not an issue for a company that expects to sell hundreds, if not thousands of cabs. The only way I manage to sell my plans for $15 is that their sales also number in the thousands.

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[quote name='Beer of the Bass' timestamp='1436094209' post='2814838']
It occurs to me that while it's not unusual to come up with a functional cab as a DIY effort, trying to make something which does the job of your Vanderkley but lighter and smaller could be setting the bar rather high. It's already about as small as a 2x12" could reasonably be without sacrificing bass response, is built with lightweight plywood and uses very good drivers (Faital, I think?). A 1x12" with similar voicing might be an attainable goal though.
[/quote]
Fair comment I think, the nearest you might get would be with a long throw bass driver and some sort of midrange driver but then you'll need to follow a design like the Greenboy or design a crosssover yourself which doubles your problems.

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[quote name='TRBboy' timestamp='1436087450' post='2814770']
(...)
I would love to have something which sounds at least as good as my 2X12" but is a 'one-hand carry'.....
(...)
[/quote]

Sorry to point out the obvious, i can easily lift/carry my Super12T with just one hand. Even easier if i decide to keep it on the floor and use the wheels ;)
2x12"+T, 19Kg, nice low-end, flat(ish) voicing

Maybe you should see if you can try one.

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Hi guys, sorry I haven't responded for a while!

I realise that I currently have one of the best sounding, lightest and and most compact 2x12" cabs on the market, but I was just curious really. My idea, basically, was to try having a cab which was not much bigger than a 1x12", but with a 12" mid driver and horn/tweeter in the front, ported, and then a 12" (or maybe even 10") LF driver facing downwards into a slot at the bottom and ported (effectively working as a subwoofer). Don't know if this makes sense without a picture! There would be a 3-way crossover (obvs.).

Bill: With the greatest of respect, I know that theoretically two tens or one twelve with the same driver displacement could be equal, but I know from experience that in reality they would never stack up against a top quality 2x12" in practice, no matter what the claims of the manufacturer are.

Ghost_Bass: I can lift the vanderkley with one hand, it's not heavy, but the handles are positioned for a two handed lift which means it doesn't balance well in one hand. Also in reality, it's very difficult to try and squeeze through a standard doorway with the cab in one hand, bass in the other and a backpack on! :D As far as Barefaced goes, it's kind of 'been there, done that' for me, although I've never tried a Super12T, but I don't believe they're made any more anyway.

Thanks for all of your advice guys. Realistically, I don't think that I'm going to have the time, money or expertise in the foreseeable to have a go at making my thoughts reality, but I'll keep you posted if that changes. :D

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having a downward facing sub-woofer would be perfectly acceptable provided certain other conditions are met and would allow you to reduce the size of the baffle, however there is still the need to have enough volume in the cab to allow the two speakers to work properly. Effectively you would need to have a cab for each speaker so the need to be downward facing is not likely to arise in practice. It would be about changing the shape of the cab and not about changing the volume.

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[quote name='Phil Starr' timestamp='1437136138' post='2823892']
having a downward facing sub-woofer would be perfectly acceptable provided certain other conditions are met and would allow you to reduce the size of the baffle, however there is still the need to have enough volume in the cab to allow the two speakers to work properly. Effectively you would need to have a cab for each speaker so the need to be downward facing is not likely to arise in practice. It would be about changing the shape of the cab and not about changing the volume.
[/quote]

Ah, thanks Phil. Yeah, I was kind of thinking that the cab would be a bit taller and deeper than a 1X12", and that the inside would be partitioned to segregate the speakers and allow sufficient volume for each driver. You think it could potentially work then?

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