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Re: Australian Jack Stack
Posted: Wed Oct 19, 2011 6:06 am
by cheapbasslovin
NeilD321 wrote:Has anybody else noticed how easy it is to accidentally build wind (twist) into the cab using Bill's method? I.e. Attach the bottom, attach the top THEN attach the sides.
I'm a fairly experienced hobbist cab builder but as it's my first BFM build I followed the instructions to the letter (I think) and one of my cabs has about 2mm of wind in it. Nobody but me will notice, but it's not square
Wondering if anybody has a good tip for attaching the top square to the bottom before adding the sides?
In hindsight I think I'd attach the bottom then, once the glue is dry, temporarily attach the top. Trim the mouth plates then attach the top and sides at the same time and square the whole thing up before the glue sets.
I'd be surprised if mine only had that much twist. I don't have much woodworking experience, maybe the instructions were for folks like me who wouldn't even know where to begin trying to slap a bunch of pieces together at once and trying (hoping) to square.
I was shooting for 'square enough'
. I understand if you are aiming for a higher standard, though.
Re: Australian Jack Stack
Posted: Thu Oct 27, 2011 4:18 pm
by NeilD321
Been beavering away for a while and this is where the cabs are up to now.
Re: Australian Jack Stack
Posted: Thu Oct 27, 2011 4:24 pm
by NeilD321
Quick question folks....
I'm going to put these handles into the Jack12's. They will take up a small amount of internal volume. I believe this will make a difference to the sound so I was hoping someone could explain what will change (if anything). I'm a newbie remember, with a vast amount of learning to do.
Re: Australian Jack Stack
Posted: Thu Oct 27, 2011 4:26 pm
by NeilD321
Oh, while I was waiting for the glue to dry on the Jacks, I knocked together an XF12 cab. It is WAY lighter than the Hughes and Kettner cab I'm pulling the drivers out of. Cant wait to try it out.
Re: Australian Jack Stack
Posted: Tue Nov 01, 2011 11:02 pm
by NeilD321
The box of bits I ordered turned up. Yay! Here I am cutting up the piezo's for the melded array. Man, those little pieces of plastic sting. Never needed to wear a glove while using the cross cut sled before!
Re: Australian Jack Stack
Posted: Tue Nov 01, 2011 11:04 pm
by NeilD321
Mid glue up and the final arrays
Re: Australian Jack Stack
Posted: Wed Nov 02, 2011 3:28 pm
by AntonZ
NeilD321 wrote:The box of bits I ordered turned up. Yay! Here I am cutting up the piezo's for the melded array. Man, those little pieces of plastic sting. Never needed to wear a glove while using the cross cut sled before!
I'd advise to add some device to your jig that keeps the piezo's in place instead of using your hand. Your hand is too close to the blade. I think Leland or Harley have posted pics of how they equiped their jigs. Take good care of your fingers, they are your most valuable tool. My 2c.
Your array looks great
Re: Australian Jack Stack
Posted: Wed Nov 02, 2011 6:17 pm
by NeilD321
Thanks for the advice. The blade was only 5mm high while doing this as I am using the alternating method of assembly. I used a hold down block when cutting the 45 degree cut.
Re: Australian Jack Stack
Posted: Thu Nov 03, 2011 4:39 pm
by NeilD321
and now they're purple!
Re: Australian Jack Stack
Posted: Thu Nov 03, 2011 4:48 pm
by Bill Fitzmaurice
Be very careful wiring the tweeters, with the alternating lug direction. Even one tweeter wired with reverse polarity will foul up the works, let alone more than one.
Re: Australian Jack Stack
Posted: Thu Nov 03, 2011 4:54 pm
by NeilD321
That's a very good point Bill. I'll tripple check everything before soldering. Thank you for the input.
Re: Australian Jack Stack
Posted: Thu Nov 03, 2011 4:57 pm
by NeilD321
Re: Australian Jack Stack
Posted: Thu Nov 03, 2011 6:03 pm
by AntonZ
With the way you cut the tweeters Neil, I find the wiring a lot easier and less likely to mess up when the elements are put back in place like so:
This makes wiring straight forward again:
Re: Australian Jack Stack
Posted: Thu Nov 03, 2011 7:04 pm
by NeilD321
Nice, thanks Antonz. I was going to turn the outside ones 120 degrees but turning them both is even better. Thanks for the tip.
I just noticed the red dots and I assume they are on the positive terminal. Did you put those on?
Also, has anyone covered the back of the array with a protective cover of some sort?
It's just that I don't plan to use a grill and I'd like to keep prying fingers away from the back of the array.
Re: Australian Jack Stack
Posted: Thu Nov 03, 2011 7:12 pm
by AntonZ
You are welcome, glad to be of help. Those tweeters come with the red dots, and they are on the positive indeed.
I haven't covered the back. On the one cab that I have with exposed array I have made the supports just deep enough to hardly show the back of the arrays. Not guaranteed to keep prying fingers out, but it helps if there is not much to see.