Curved UM18 sealed build - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 16 Old 12-18-2016, 03:50 PM - Thread Starter
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Curved UM18 sealed build

I started building this enclosure about 4 years ago, but left it unfinished in my shed for various reasons, until a month ago I decided I needed bass back after selling my Velodyne DD12 at the start of the summer.

Here's the build pics from 4 years ago




Here's how I left it until taking it out the shed last month
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post #2 of 16 Old 12-18-2016, 03:54 PM - Thread Starter
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I used 'No more nails to fill the kerf cuts


Marking the cutout for the driver






I rounded over the edges with the router
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post #3 of 16 Old 12-18-2016, 03:59 PM - Thread Starter
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This was painstakingly slow dripping glue down the cuts from the top and bottom to fill where the 'No more nails' didn't reach.


Hole for the speakon connector


The UM18-22


Extra bracing added


Acoustic wadding


And driver installed


Amp is an inuke6000dsp
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post #4 of 16 Old 12-18-2016, 04:27 PM
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Well, I would say the glue is probably dry by now.

Very nice build. I've always wanted to try kerfing MDF but just never had a need...and probably not the talent either. And kerfing 3/4" stuff must be pretty challenging. It was smart to fill in the kerf gaps with filler or glue or whatever that stuff is.

I would imagine that you've moved since you started this build? Typically when someone builds anything other than a square box, it's for looks. I.E. the final product will be out in the open and seen. Looks like now, it's in a corner. Nothing wrong with that, of course, but sort of a shame to hide all that hard work. What are the plans for finishing the box?
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post #5 of 16 Old 12-18-2016, 04:52 PM - Thread Starter
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Curved UM18 sealed build

Quote:
Originally Posted by michaelddd View Post
Well, I would say the glue is probably dry by now.



Very nice build. I've always wanted to try kerfing MDF but just never had a need...and probably not the talent either. And kerfing 3/4" stuff must be pretty challenging. It was smart to fill in the kerf gaps with filler or glue or whatever that stuff is.



I would imagine that you've moved since you started this build? Typically when someone builds anything other than a square box, it's for looks. I.E. the final product will be out in the open and seen. Looks like now, it's in a corner. Nothing wrong with that, of course, but sort of a shame to hide all that hard work. What are the plans for finishing the box?


Thanks Michael.

The MDF is 1" and it was trial and error gradually cutting into it until it bent enough.
My original plan was that this would be a test box for size and shape, then I wanted to build a curved stacked ply box and leave the layers of bare wood on show.

I'm in the same house but moved the room around 90deg to mount the tv over the fireplace to save floor space, so I'm a bit tight for space

I'm unsure on how to finish the sub yet as I'm going to build another but don't know if I can face the effort of another curved box to match this. I might even build subs into units for storage like a sideboard.

Cheers
Matt
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post #6 of 16 Old 12-19-2016, 10:47 AM
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Quote:
Originally Posted by michaelddd View Post
What are the plans for finishing the box?
Step 1: Leave unfinished for 4 years.
Step 2: Remove dust...



It looks really cool, and I can understand not wanting to go through that process again for another curved box... but think how awesome a pair of them would look. Finish them both at the same time. Really nice build.
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post #7 of 16 Old 12-19-2016, 04:11 PM - Thread Starter
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Quote:
Originally Posted by OJ Bartley View Post
Step 1: Leave unfinished for 4 years.
Step 2: Remove dust...



It looks really cool, and I can understand not wanting to go through that process again for another curved box... but think how awesome a pair of them would look. Finish them both at the same time. Really nice build.


Thanks

I might convince myself to build another in the spring or summer as I would like a matching pair.
I hope to use them as speaker stands, like a Wilson audio watt puppy style with something between speaker and sub for isolation.
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post #8 of 16 Old 01-06-2017, 04:18 PM
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How does it sound!? Box looks good to me!

HT setup: Vizio 50" 4K | Xbox & PS3 | Pioneer Elite VSX-94TX | Bose 701 towers (V1) | JBL S Center | Def Tech Reference SuperCube & Def Tech PF15TL+
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post #9 of 16 Old 02-15-2017, 01:23 PM - Thread Starter
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Quote:
Originally Posted by Brazle View Post
How does it sound!? Box looks good to me!


It sounds great. Only playing 30hz and down at the moment as my speakers are running full range.
It's reaching down to 5hz with plenty of eq and room gain. Having the door open in the room causes quite a large peak at 8hz which seems useful
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post #10 of 16 Old 02-17-2017, 06:55 AM
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What is the internal size/volume of that enclosure? I like the curves.

My HT build: Tower Cinema - 9.1.6 in a 12'x12' room

Marantz | NAD | Monitor Audio | SVS | Pioneer
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post #11 of 16 Old 02-17-2017, 03:31 PM
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Quote:
Originally Posted by MattSPL View Post
It sounds great. Only playing 30hz and down at the moment as my speakers are running full range.
It's reaching down to 5hz with plenty of eq and room gain. Having the door open in the room causes quite a large peak at 8hz which seems useful
Perhaps your room is acting as a huge bandpass enclosure, and the door is the port
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post #12 of 16 Old 02-17-2017, 03:35 PM - Thread Starter
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Quote:
Originally Posted by Mashie Saldana View Post
What is the internal size/volume of that enclosure? I like the curves.


The cabinet is 22 inch cubed, but curves to about 18 inches at the back. I guess around 100 to 120L.
It's built from 1 inch mdf with a 2 inch baffle and lots of Acoustic wadding inside.
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post #13 of 16 Old 02-17-2017, 03:36 PM - Thread Starter
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Quote:
Originally Posted by sandydankness View Post
Perhaps your room is acting as a huge bandpass enclosure, and the door is the port


Yes I think your right, because when I close the door, the 8hz peak flattens out.
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post #14 of 16 Old Today, 11:20 AM
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post #15 of 16 Unread Today, 01:31 PM
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Was the reason for the curve to reduce standing waves, or just for looks? I considered going trapeziod for mine to not have all the panels parallel.
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post #16 of 16 Unread Today, 02:19 PM - Thread Starter
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Quote:
Originally Posted by erik.vanhamme View Post
Was the reason for the curve to reduce standing waves, or just for looks? I considered going trapeziod for mine to not have all the panels parallel.


It was partially for looks and also to reduce standing waves.
This box was originally intended as a test box for an LMS Ultra, then I was going to attempt a layered birch ply box. All these ideas went out the window due to finances.
Then recently I decided to finish this box but on a tighter budget, so the UM18 and nu6000 were the logical choice as I can add a second sub to this amp when I have the time and money to build one.
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