Italian Job Sub Build 6 21s - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 95 Old 07-19-2019, 11:46 AM - Thread Starter
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Italian Job Sub Build 6 21s

I can believe I’m at this point in my HT now building subs. The inspiration for this build if from being at Mike’s aka @eng-399 GTG (my first one) I flew from Toronto to Chicago and that’s what has caused my obsession for bass his 4 21s up front and his 6 15s as nearfield and the naming of my theatre build after Mike.

And then I met Jeremy @hd0823 and Jared @Jk7.2 I was doomed seeing there rooms which are insane (in a good way) for amount of bass and over all sound.

So in 2017 I bought 8 UM18s thinking that was the best way to go for the money, well I didn’t even crack open all the boxes and sold them this year and bought 6 LaVoce SAN214.50 21".

This is why this build is called the Italian Job 6 Italian subs.

All the box designs are from Mike, what an amazing guy, the patience he has had with me, design all my boxes for my UMs and them not even going with them an now the design for 21s which we just finalized a few minutes ago.

Hears the design:

The 4 fronts are stackable 2 on each side of the centre channel, ports will fire out the side instead of the front so it doesn’t affect the screen.

25”w x 23.5”d x 43”h

12.42cf before bracing and driver

tuned to 17hz

Here is what it will look like, it has been revised so those dimensions as not the same.




The rear design

30”w x 16”d x 54”h

12.79cf before bracing and driver

Tuned to 17hz



I will be directing all questions of total output graphs and what ever else to Mike lol. I know what I like but I don’t know how to explain it.

The subs are waiting for me to pick up in Michigan which I will be doing August 10th at the GTG that Jeremy and Jared are having.




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post #2 of 95 Old 07-19-2019, 11:49 AM - Thread Starter
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Started cutting wood today and got rained out for now will start up later on. Got the back sub cut out except ports and started the fronts.




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post #3 of 95 Old 07-19-2019, 12:35 PM
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So happy for you! Looking forward to meeting you at the GTG.
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post #4 of 95 Old 07-19-2019, 01:12 PM - Thread Starter
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Look forward in meeting you as well should be epic GTG again


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post #5 of 95 Old 07-19-2019, 01:28 PM - Thread Starter
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Back atter, I think I’m pretty motivated or stupid one or the other, where I live just north of Toronto it feel like 40c for my fellow Americans 105f.

But a nice cold beer always goes down better in this kind of heat.

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post #6 of 95 Old 07-19-2019, 02:22 PM
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post #7 of 95 Old 07-19-2019, 02:51 PM
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Man, they are going to be able to feel those things all the way down to the stop sign in the last pic!


Hope your in good with the folks on either side of you.....even with a built room you might levitate their beds.




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post #8 of 95 Old 07-19-2019, 03:16 PM - Thread Starter
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Quote:
Originally Posted by Falonious View Post
Man, they are going to be able to feel those things all the way down to the stop sign in the last pic!


Hope your in good with the folks on either side of you.....even with a built room you might levitate their beds.






Well that’s the thing I have told (warned) my neighbours every time they ask me what I am building and I say “a home theatre” they say “that’s cool” and today “what are you building now” I say “6 21” sub boxes for the HT” they said “that’s cool”. Well I am not sure how cool they will think it’s going to be when the hulk is vibrating all their doors or when John Wick is playing and they call the cops because they heard gun fire. As I said I told (warned) them lol.


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post #9 of 95 Old 07-19-2019, 04:36 PM
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Glad you started this thread. I will be following! And I can’t wait to see you and everyone else again at my place soon!
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post #10 of 95 Old 07-19-2019, 06:05 PM - Thread Starter
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Well after an extremely hot day and a whole bunch of sawdust the subs are all cut, I used 8 4x10 sheets of plywood, not fun to work with but I got them really cheap so you use what you can get. As for scraps there are very little do do using an iPad app called Cut Calculator, couldn’t have done it without it.



I have to work tomorrow so I will start building Sunday.


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post #11 of 95 Old 07-20-2019, 01:54 PM
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This is the winisd rear subs air port velocity,17 high pass in place and an est. of all 6-21'' subs playing with max output.
Ill post the front sub info in the next post along with the cut sheet.
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post #12 of 95 Old 07-20-2019, 02:01 PM
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post #13 of 95 Old 07-20-2019, 04:00 PM - Thread Starter
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Awesome thanks Mike for sharing this info


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post #14 of 95 Old 07-21-2019, 09:09 AM - Thread Starter
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I am hoping some could answer this question before I start building the front sub boxes. After doing a dry fit I realized I screwed up one cut which affects 3 other ones which is no big deal I can cut the 12 panels needed to be shortened. With all the parameters that Mike has put into WinISD will it matter if the box is 3/4” shorter, the internal volume will be less by a little bit. These are the things I don’t understand.

Thanks


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post #15 of 95 Old 07-21-2019, 09:16 AM
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Quote:
Originally Posted by Mahuzz13 View Post
I am hoping some could answer this question before I start building the front sub boxes. After doing a dry fit I realized I screwed up one cut which affects 3 other ones which is no big deal I can cut the 12 panels needed to be shortened. With all the parameters that Mike has put into WinISD will it matter if the box is 3/4” shorter, the internal volume will be less by a little bit. These are the things I don’t understand.

Thanks


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Unless it effects the port, the volume that the box is effected will not be an issue. Likely not audible, maybe not even measurable difference.
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post #16 of 95 Old 07-21-2019, 10:05 AM - Thread Starter
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Thanks Jared


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post #17 of 95 Old 07-21-2019, 03:07 PM - Thread Starter
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Here is what I got so far with the build, had to cut it short and go enjoy an early patio bar dinner.

After a long discussion with Mike today we had a few numbers wrong in the cut sheet which has been revised and corrected. I am not doing the traditional glue and clamp, I don’t have time or the money to buy all those clamps so I and pocket hole and glue almost everything.



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post #18 of 95 Old 07-21-2019, 06:06 PM
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Quote:
Originally Posted by Mahuzz13 View Post
Here is what I got so far with the build, had to cut it short and go enjoy an early patio bar dinner.

After a long discussion with Mike today we had a few numbers wrong in the cut sheet which has been revised and corrected. I am not doing the traditional glue and clamp, I don’t have time or the money to buy all those clamps so I and pocket hole and glue almost everything.

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Another fan of pocket holes I see. I love my Kreg jig and have found it is useful for sub cabs among other things.

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post #19 of 95 Old 07-22-2019, 11:10 AM
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Did you use the 1” or 1 1/4” screws. I’ll be using my kreg jig for my build shortly but with an actual thickness of 0.688 it falls between the two. Either should work but curious what you used.


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post #20 of 95 Old 07-22-2019, 11:46 AM - Thread Starter
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Did you use the 1” or 1 1/4” screws. I’ll be using my kreg jig for my build shortly but with an actual thickness of 0.688 it falls between the two. Either should work but curious what you used.


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I used the 1 1/4” screws, so that 5/8 material, I think they should work for you just set the jig to 5/8 so the drill bit doesn’t sink to far into the material


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post #21 of 95 Old 07-22-2019, 02:53 PM
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The kregs worked great for my "periscope" subs. Even got away with a 3/8 roundover without hitting anything. I did need clamps for the front baffle as I tried to avoid as many extenal pocket holes as I could. I did them external for one part of the port because I thought they looked kinda cool.
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post #22 of 95 Old 07-22-2019, 03:58 PM - Thread Starter
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I am not sure why people don’t do more pocket holes sub builds unless you have all the clamps them fine but still once they are screed you can continue with the build no wait time in between.

Are for the front baffle not sure what I’m going to do yet but when the time comes it will probably be pocket holes somewhere


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post #23 of 95 Old 07-22-2019, 06:23 PM
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Quote:
Originally Posted by Mahuzz13 View Post
I am not sure why people don’t do more pocket holes sub builds unless you have all the clamps them fine but still once they are screed you can continue with the build no wait time in between.

Are for the front baffle not sure what I’m going to do yet but when the time comes it will probably be pocket holes somewhere


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You know I'm a fan of pocket holes lol.

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post #24 of 95 Old 07-22-2019, 06:37 PM - Thread Starter
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Yes I do know that and when you get to use the best of the best pocket hole machine it would be hard to go back to the Kreg R-3 lol


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post #25 of 95 Old 07-22-2019, 07:44 PM
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Quote:
Originally Posted by Mahuzz13 View Post
I am not sure why people don’t do more pocket holes sub builds unless you have all the clamps them fine but still once they are screed you can continue with the build no wait time in between.

Are for the front baffle not sure what I’m going to do yet but when the time comes it will probably be pocket holes somewhere


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It's one of those things... It takes a lot longer, isn't any stronger than just glue. You only need a few clamps and brad nailer, the boxes can go together in one shot, no waiting. Clamp the pieces together, bam bam, move to the next. You could build the boxes in half the time.

Theres nothing wrong with using the Kreg system, just lots of us don't want to bother as in the end, it doesn't offer an advantage over just glue and a nailer.
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post #26 of 95 Old 07-22-2019, 08:10 PM
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great looking work,

kregs and PL3

waiting to hear how the GTG comes out
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post #27 of 95 Old 07-23-2019, 02:42 AM
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Quote:
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Yes I do know that and when you get to use the best of the best pocket hole machine it would be hard to go back to the Kreg R-3 lol


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What is the best Pocket hole machine?


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post #28 of 95 Old 07-23-2019, 02:47 AM - Thread Starter
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The foreman

https://www.kregtool.com/store/c26/p...e/?source=5540


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post #29 of 95 Old 07-23-2019, 02:48 AM
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What is the best Pocket hole machine?


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Kregg foreman I actually borrowed it from a buddy did all the kreggs in the submaximus v3 probally in 30 minutes. It's a awesome machine

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post #30 of 95 Old 07-23-2019, 04:50 AM
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A lot of us make our boxes out of MDF so that system isn't the best option...
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