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BFM Jack 12 build


Big Mick
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[quote name='Pentode' post='1032439' date='Nov 22 2010, 11:54 AM']Excellent! Love Bills' designs - what driver are you planning on using?[/quote]

It's just starting to come together. I found a local supplier of Baltic Birch plywood who's prices are very reasonable, so I'll pick up a sheet and maybe start cutting tomorrow.

I'm going for the Eminence Kappalite 3012 driver, not sure if it'll be the LF or HO version [url="http://www.bluearan.co.uk/index.php?id=EMIKLIT3012HO&browsemode=manufacturer"]http://www.bluearan.co.uk/index.php?id=EMI...de=manufacturer[/url] [url="http://www.bluearan.co.uk/index.php?id=EMIKLIT3012LF&browsemode=manufacturer"]http://www.bluearan.co.uk/index.php?id=EMI...de=manufacturer[/url] both are the same price from Blue Aran. Bill used to recommend the LF version but my plans say the HO is the one to go for. As soon as my registration on the BFM forum is confirmed I'll ask why!

I intend to build one 1x12 without tweeter array first and see how that goes (I don't really play slap bass so the tweeters are not necessary). If it's a success then I'll do a second one with tweeters to stack together. I was thinking of an OMNI15 TB, but cost is a major factor and it seems from reading the forums that 2 Jack 1x12's are perfectly adequate for my needs, that and the fact that the TB is the size of a wheelie bin!!!!

Cheers, Mick. :)

Edited by Big Mick
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[quote name='Big Mick' post='1033182' date='Nov 22 2010, 09:02 PM']It's just starting to come together. I found a local supplier of Baltic Birch plywood who's prices are very reasonable, so I'll pick up a sheet and maybe start cutting tomorrow.

I'm going for the Eminence Kappalite 3012 driver, not sure if it'll be the LF or HO version [url="http://www.bluearan.co.uk/index.php?id=EMIKLIT3012HO&browsemode=manufacturer"]http://www.bluearan.co.uk/index.php?id=EMI...de=manufacturer[/url] [url="http://www.bluearan.co.uk/index.php?id=EMIKLIT3012LF&browsemode=manufacturer"]http://www.bluearan.co.uk/index.php?id=EMI...de=manufacturer[/url] both are the same price from Blue Aran. Bill used to recommend the LF version but my plans say the HO is the one to go for. As soon as my registration on the BFM forum is confirmed I'll ask why!

I intend to build one 1x12 without tweeter array first and see how that goes (I don't really play slap bass so the tweeters are not necessary). If it's a success then I'll do a second one with tweeters to stack together. I was thinking of an OMNI15 TB, but cost is a major factor and it seems from reading the forums that 2 Jack 1x12's are perfectly adequate for my needs, that and the fact that the TB is the size of a wheelie bin!!!!

Cheers, Mick. :)[/quote]

Bill says use the 3012HO driver, will order it tomorrow. I may have got myself confused after reading so much about Omni 15's

Cheers, Mick. :)

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Right, bits ordered!

Cost so far: Eminence Kappalite 3012HO driver £121 (delivered)
Hardware £21 (corners, carry strap, connectors etc.)
8x4 plywood sheet 12mm £21
BFM Jack12 plans £10ish

Total £173..............so far.

Stuff still to get: cab covering, cab sound deadening, front grille (optional), recessed carry handles (optional), adhesive, wiring materials.


So far, so good!

Cheers, Mick. :)

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[quote name='steve' post='1034102' date='Nov 23 2010, 05:02 PM']Mick, who's your supplier of Baltic Birch? I ended up going to B&Q when I built my omnis :)[/quote]

Hiya Steve, found baltic birch at Peter Benson Plywood in Darwen. [url="http://www.pbplywood.co.uk/"]http://www.pbplywood.co.uk/[/url] £29 for a 8x4 sheet.

I ended up going to Howarths Timber in Bury and got a sheet of decent looking stuff for £17, it's not birch but it looks ok. If I was going with a wood finish I would've lashed out on the better stuff. Wickes and B+Q want £30ish for tatty looking stuff and B+Q only had 18mm Birch ply @ £56!!!!!!!!!

Cutting and pics. tomorrow!

Cheers, Mick. :)

Edited by Big Mick
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[quote name='steve' post='1034102' date='Nov 23 2010, 05:02 PM']Mick, who's your supplier of Baltic Birch? I ended up going to B&Q when I built my omnis :)[/quote]

In case anyone's interested, when we built a few J10s we used the lightweight poplar ply from Avon Plywood in Bristol. Not particularly cheap but it's good quality and incredibly light.
Wasn't really sold on the J10s though, at least for PA.

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[quote name='jonthebass' post='1035643' date='Nov 24 2010, 09:32 PM']Nice one Big Mick and can't wait to see your cab develop.

Cheers,
Jon[/quote]

Well you can start right here! got some cutting done tonight, most of the big panels are rough cut (it's been a while).

Cunning use of V-drums monitor.

Note extra floodlight on workbench (also doubles as a heater).

Some panels!

Baffle plate marked out ready for tomorrow.

I intend to cut as many panels as I can at the start to avoid having large bits of plywood everywhere.

Cheers, Mick. :)

Edited by Big Mick
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Got the baffle plate cut out. Note to self........ freehand routing is a bad idea!



Next time I'll think things through beforehand. Nevermind, once it's behind a grille and painted black it'll be fine!!!!
On a more positive note, I'm making a circle cutter for my router to help with the driver spacer and phase plug pieces.

Cheers, Mick. :)

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Hope that sign on the wall says 'empty' and not 'numpty' :)

Looking forward to this - Bills designs are just so different to everything else out there. At one stage I was thinking of a Omni 15TB, but tools and talent in short supply. I'm quite happy to sit back now and watch other people build things. Hope it turns out really well. :)

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[quote name='steve' post='1041849' date='Nov 29 2010, 11:57 PM']good stuff Mick, is there much more cutting left to do?[/quote]

Not really, just the internal bracing pieces and a couple of small bits. I should get some construction done today, if I can get to the workshop (bastard snow..grrrrrr)

Cheers, Mick. :)

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[quote name='Big Mick' post='1046696' date='Dec 3 2010, 07:01 PM']Was going to put some pics. up today but spent the afternoon in A+E after some unexpected chest pains.
I'm feeling ok now and will get on with it tomorrow.

Cheers, Mick. :)[/quote]

hope all is well, best wishes

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[quote name='Big Mick' post='1046696' date='Dec 3 2010, 07:01 PM']Was going to put some pics. up today but spent the afternoon in A+E after some unexpected chest pains.
I'm feeling ok now and will get on with it tomorrow.

Cheers, Mick. :)[/quote]

good to hear your recovered m8

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Feeling much better today thanks.
So, I measured the inside diameter of the driver gasket, 11 1/16" then marked out the holes to mount the driver using a 1/8 - 1/4 jack adaptor to push through the holes in the driver frame.







Phase plug.



Found a proper block plane at the Mother in Law's. Quick sharpen of the blade and it works really well.



The throat under construction, I screwed and glued these bits together.



Throat assembly glued and ready for fitting to the baffle.



No screws this time, just a bag full of loose change!



Cheers, Mick. :)

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