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LAB Sub Build

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Chris P View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Chris P Quote  Post ReplyReply Direct Link To This Post Posted: 07 March 2008 at 3:04pm
Cheers fellas! Right, thats that settled then. Ply sides it is. I'm just working on those funny angled pieces that lead from the heart of the module to the begining of the mouth of the horn. Those angles are proving to be a right mare....
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Lasse Lukkari Quote  Post ReplyReply Direct Link To This Post Posted: 07 March 2008 at 10:37am
At the time I built my first two labsubs 4 years ago there wasn't any mm plans available and I didn't know how to use cad, so i used 19mm mdf for the module just like you. Everything else is 18mm ply.

Edited by Lasse Lukkari - 07 March 2008 at 10:38am
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biotec View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote biotec Quote  Post ReplyReply Direct Link To This Post Posted: 07 March 2008 at 10:14am
I think the comprimise that you suggest is perfect, it should last as long as a ply cab and will meet your budget. Good luck with the rest of the build, it's not a particularly complex cab to build, it's just slow because of the number of pieces and needs to be done perfectly to ensure everything is nice and air tight.
 
If in doubt, get the gripfill and polyeurethane glue out.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote MarjanM Quote  Post ReplyReply Direct Link To This Post Posted: 06 March 2008 at 11:24pm
If you combine ply and mdf than just make the big side panels from ply. They are handeling most of the abuse.

MDF is fragile and corners can be easily damaged with all that weight even  by the ligt impact during the transport.

To load tne labsub in the truck you need minimum of two strong man.
Marjan Milosevic
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Bold Audio Inc
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jethrocker Quote  Post ReplyReply Direct Link To This Post Posted: 06 March 2008 at 10:40pm
Chris..I'd say do exactly what you describe in your above post... ply outer, mdf inner, with internal panels sealed (buying a sealant or using pva would be easier than painting them twice I guess) they should last as long as a full ply cab, and will cost you just a little more than full mdf.
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Chris P View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Chris P Quote  Post ReplyReply Direct Link To This Post Posted: 06 March 2008 at 9:37pm
Hmm, i've got all worried now. Seems to be some strong  arguments. I know Ply is by far superior in terms of toughness, but MDF is cheap. As i said in an earlier post, id far rather make a mistake on a £15 sheet of MDF than a £30 sheet of ply. I cant afford mistakes like that. But i still want a set of cabs at the end to show for it.

 What i may well end up doing, is making the internals out of MDF, but the sides out of ply. As these are the areas (obviously) that will receiev the abuse. I paint my cabinets inside and out as i know with MDF moisture is an issue. My thinking is if every surface showing has at LEAST two coats on, it will slow down any moisture trying to get in. 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mark James Quote  Post ReplyReply Direct Link To This Post Posted: 06 March 2008 at 9:11pm
I have to agree with hbl ive seen some 1850s made from mdf take quite a pounding before, outdoors and in and getting packed in and out of a truck in a muddy field by a bunch of stumbling spooners [me being one of them] and they were fine,
alough birch would blatently be better!!!
bpm project part two in pregress !!!

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Heathrow_B_line Quote  Post ReplyReply Direct Link To This Post Posted: 06 March 2008 at 9:03pm
i have found from my own experience that the weight difference between birch ply and mdf is quite small, so the weight would not put me off.  i would however try and think about best place for handles now.
 
maybe make one, then figure out if you need to make changes
 
they are looking good though, im sure you wont ever need to replace them with birch cabs
Produce a killer sound. Take no prisoners.
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biotec View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote biotec Quote  Post ReplyReply Direct Link To This Post Posted: 06 March 2008 at 8:14pm
I would stop where you are and wait until you can afford ply for the rest of the cabinets. In my opinion this is not the kind of box you want to construct from MDF unless it is staying put. The cabinet is so heavy that simply rolling the cab on corners and edges will damge them because of the self weight of the box. This is an expensive speaker to load, build and amp correctly, using ply instead of MDF will not change the overall cost considerably.
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Chris P View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Chris P Quote  Post ReplyReply Direct Link To This Post Posted: 06 March 2008 at 8:13pm
Well, im not building them with selling them in mind. I want to get some use out of them. This isnt a business for me, its just a hobby. Even if i end up using them as firewood in 2010 they will have still served me a purpose. 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote norty303 Quote  Post ReplyReply Direct Link To This Post Posted: 06 March 2008 at 8:10pm
The selling of them may be more difficult than the building methinks.....
..is really, really not admin or anything to do with the site anymore, so just when you think 'I'll PM Norty'..... don't!
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Chris P View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Chris P Quote  Post ReplyReply Direct Link To This Post Posted: 06 March 2008 at 7:49pm
Yeah i know, they will weigh a ton and will probarbly break when they get dropped. I simply cant afford ply. Not at this stage. I'm still learning the craft. If i can consistantly make cabs to a decent standard without screwing up any cuts, i'll sell the cabs i have and remake them from ply.
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