Dual Mini Marty Build - Using UM18-22's - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 34 Old 11-11-2014, 11:55 AM - Thread Starter
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Twin Mini Marty Build - Using UM18-22's

We moved into a brand new home and I decided to pimp out a media room! My room has 12ft ceilings so I was worried about bass being sucked up from the volume of air space in the room.

After a conversation with chalugadp, I chose dual Mini Marty's for their output, the room size and limited floor space (wife wouldn't let me put subs in the ceiling!). The mini martys will have Dayton Ultimax 18's (UM18-22) and I will be running them off of an Inuke 6000dsp. For the money, this combination was the best I could find.

Many of my tools were stolen out of my garage awhile back and I hadn't bought any new tools to replace them yet. So I purchased 2 mini marty flatpacks from chalugadp and was off and running!

I used black caulk to seal, but I don't recommend it! Especially since I used PL Premium which air seals anyway...




Painted ports black:







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Last edited by mlah384; 11-11-2014 at 01:38 PM.
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post #2 of 34 Old 11-11-2014, 11:55 AM - Thread Starter
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Tried mounting driver like a PRO (I don't recommend!)

Just use wood screws into plywood blocks... I learned the hard way that if you don't have a robot assembly line/CNC machine that perfectly lines up holes, angle of insert, etc... then you will cross-thread and have to tap them ALL. But it is cool once it's all tapped and working... Just a HUGE pain in the a$$...







I ended up getting the longer hex bolts from Lowes since they crossthread so easily when trying to bolt the sub:



The "Save My A$$ Kit":










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Last edited by mlah384; 11-11-2014 at 12:51 PM.
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post #3 of 34 Old 11-11-2014, 12:15 PM - Thread Starter
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Bracing! and Dampening!

The flat pack came with bracing, but me and my anal retentiveness decided to buy big ass dowels from Home Depot (you cut them yourself with a primitive handsaw! was actually fun!) Of course, I cut them to exact length on the miter saw when I got home...





















I got the cheap egg crate foam (which is not egg crate, it's some weird design) from Walmart... I don't like it.. It's too thin and the ends are all permanently smashed down from the packaging... I recommend buying gray acoustic egg crate foam off of eBay from that foam company... It's 2.5" thick...
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Last edited by mlah384; 11-11-2014 at 01:30 PM.
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post #4 of 34 Old 11-11-2014, 12:15 PM - Thread Starter
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Recessed Speakon

It's always good to practice on scrap wood first!

Hole saw drill bit looks fine on entry but busted back side!





More practicing with router on scrap wood!



Yay!



Speakon flush fit:





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Last edited by mlah384; 11-18-2014 at 03:26 AM.
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post #5 of 34 Old 11-11-2014, 12:16 PM - Thread Starter
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In room temporarily testing... We just moved into the home several weeks ago and are STILL unpacking! ... To give an idea of size, that is a 55" LCD TV on top of the right mini marty:

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Last edited by mlah384; 11-11-2014 at 12:55 PM.
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post #6 of 34 Old 11-11-2014, 12:27 PM - Thread Starter
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Rounding edges, finishing, etc...

Started doing the 3/8" Roundovers and the dang bit failed!





This stuff saved the day!







Back to doing all 3/8" Roundovers













Sanded and ready to be primed, sanded again, and painted with Duratex:




Duratex (my 1st time using it... i suck at finishing... )









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Last edited by mlah384; 11-18-2014 at 03:54 AM.
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post #7 of 34 Old 11-11-2014, 02:26 PM
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Looking good man! I used the same foam you have and it seems to be working just fine.

Check out my End-Table Marty Build
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post #8 of 34 Old 11-11-2014, 04:17 PM - Thread Starter
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I just tripped the 15a breaker with TV, 6000dsp, and Denon 4520 AVR at -6db watching a YouTube HD movie... Definitely will need larger breaker as well as wire...
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post #9 of 34 Old 11-11-2014, 04:20 PM - Thread Starter
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Quote:
Originally Posted by squiers007 View Post
Looking good man! I used the same foam you have and it seems to be working just fine.
Thanks! Yeah, it sounds fine... Probably could get away with no foam it a ported sub... I'm definitely gonna use the ebay foam on the 1099s though...
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post #10 of 34 Old 11-11-2014, 04:44 PM - Thread Starter
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Two mini Marty's are impressive... They flex the windows in almost the entire house... You can feel the pressure in your ears in practically every downstairs room... You keep swallowing to try and relieve the pressure change in ear drums...

I'm very pleased with the performance... I had a car stereo in the late 80's that hit 150db, and I'm satisfied with these two minimartys... Any more and I would be worried about structural decay of the house over time...

Last edited by mlah384; 11-11-2014 at 06:16 PM.
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post #11 of 34 Old 11-12-2014, 06:10 AM
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Why do so many people put the driver in before finishing the paint job? Seem like its just more work to me. To each his own I suppose. I like the bracing job btw nicely done.
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post #12 of 34 Old 11-12-2014, 06:17 AM - Thread Starter
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Why do so many people put the driver in before finishing the paint job? Seem like its just more work to me. To each his own I suppose. I like the bracing job btw nicely done.
Thanks lemon! I put the drivers in to test them and make sure no braces were rattling, etc, but also I knew I would have to tap all the inserts with the driver in to get the correct angles... But now I gotta pull the drivers back out to paint...
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post #13 of 34 Old 11-12-2014, 06:21 AM
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No 90 degree speakon connections?

Looks good either way.
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post #14 of 34 Old 11-12-2014, 06:23 AM - Thread Starter
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No 90 degree speakon connections?

Looks good either way.
Thanks... Yeah, i wish the monoprice speakon cables had the 90 degree end on one side, I didn't think about it until I was connecting everything up... I guess I can order 90 degree ends to replace them... Not sure if monoprice even has premade cables with 90 degree ends?
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post #15 of 34 Old 11-12-2014, 07:38 AM
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Quote:
Originally Posted by mlah384 View Post
Two mini Marty's are impressive... They flex the windows in almost the entire house... You can feel the pressure in your ears in practically every downstairs room... You keep swallowing to try and relieve the pressure change in ear drums...

I'm very pleased with the performance... I had a car stereo in the late 80's that hit 150db, and I'm satisfied with these two minimartys... Any more and I would be worried about structural decay of the house over time...
I hate all of you who can get that tactile "pressure" from 2 marty's due to the rooms... my open floor space sucks up SPL like a hog so 2 FULL marty's give me good bass, but nothing like I had in my old house where you actually had to pop your ears... I just don't get the pressurization sensation... ....
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Quote:
Originally Posted by wormraper View Post
I hate all of you who can get that tactile "pressure" from 2 marty's due to the rooms... my open floor space sucks up SPL like a hog so 2 FULL marty's give me good bass, but nothing like I had in my old house where you actually had to pop your ears... I just don't get the pressurization sensation... ....
Yea, it sucks, but I love my open floor plan and tall ceilings so it's a trade off. You just need to upgrade the sound in your vehicle so you get the best of both worlds!

Check out my End-Table Marty Build
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post #17 of 34 Old 11-13-2014, 07:29 AM
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Quote:
Originally Posted by mlah384 View Post
It's always good to practice on scrap wood first!

Hole saw drill bit looks fine on entry but busted back side!



Tear out with MDF happens so easily it's crazy. It's like working with paper machete. I really don't like the stuff, but it has excellent properties for speaker cabinets.

Next time try placing some scrap behind the area where you plan to cut the hole.

I've also had some mishaps using cap screws and T-nuts. I'll not use them again. Big fat course wood screws with blocks glued in behind the MDF is the way to go.

Good build. Thanks for posting all of the details.


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This is a great build, and those subs are going to look MEAN when finished! If it's not too much trouble, could you post a review on Parts Express' site giving your impressions of the UM18-22? We've sold more of these in the past few months than any new sub we've brought out, but there are still only three reviews so far, and I'd appreciate having more. You can even upload some of your build photos, so anybody buying an Ultimax 18 will draw inspiration from what you've accomplished here.
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post #19 of 34 Old 11-13-2014, 02:09 PM
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Looking good!! What dimensions/volume are those? I am jealous that your getting to test drive these bad boys already

Not trying to thread jack, but mine are coming along slowly since I decided to go ahead and build 8 1262's while I was at it. I went with a slightly smaller cab than I had first planned, 9.4 cu ft net; 24 x 30 x 31.

Edit: Duh, I totally overlooked your box was a mini marty. I see the net volume is roughly the same as mine.
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post #20 of 34 Old 11-13-2014, 02:40 PM
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u need a bigger tv.
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post #21 of 34 Old 11-13-2014, 03:27 PM - Thread Starter
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Quote:
Originally Posted by DaytonAudioRory View Post
This is a great build, and those subs are going to look MEAN when finished! If it's not too much trouble, could you post a review on Parts Express' site giving your impressions of the UM18-22? We've sold more of these in the past few months than any new sub we've brought out, but there are still only three reviews so far, and I'd appreciate having more. You can even upload some of your build photos, so anybody buying an Ultimax 18 will draw inspiration from what you've accomplished here.
Thanks Rory... I'll try to remember to leave a review on PE! I'm bad about not leaving reviews!
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post #22 of 34 Old 11-13-2014, 03:30 PM - Thread Starter
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Originally Posted by Doctor Morbius View Post
Tear out with MDF happens so easily it's crazy. It's like working with paper machete. I really don't like the stuff, but it has excellent properties for speaker cabinets.

Next time try placing some scrap behind the area where you plan to cut the hole.

I've also had some mishaps using cap screws and T-nuts. I'll not use them again. Big fat course wood screws with blocks glued in behind the MDF is the way to go.

Good build. Thanks for posting all of the details.
Luckily it was on the scrap wood! On the real box I made sure to not burn the wood in the hole... Dang MDF clogs up the hole saw bit! Had to keep cleaning it out... And to make sure I didn't tear through other side, I drilled 80% of way, then drilled from opposite side to complete the hole...
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post #23 of 34 Old 11-13-2014, 03:32 PM - Thread Starter
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u need a bigger tv.
Yes I do! I'm holding out for the 80" or 90" 4k LCD TVs
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post #24 of 34 Old 11-13-2014, 03:37 PM - Thread Starter
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This weekend I hope to build the AV rack that will be between the two minimartys... When finished, it should all look almost like one piece... The 1099s will be placed on top...
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post #25 of 34 Old 11-14-2014, 06:44 AM
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Quote:
Originally Posted by mlah384 View Post
This weekend I hope to build the AV rack that will be between the two minimartys... When finished, it should all look almost like one piece... The 1099s will be placed on top...
Can't wait to see, awesome build, I'm about to do the same thing with the same drivers. Now to make a cut sheet and get rolling.
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post #26 of 34 Old 11-14-2014, 05:26 PM - Thread Starter
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I'm trying to decide where to put the round overs on these minimartys... Since they will be laying on their side and butting up against an AV rack, I need to really think it through... Any thoughts?

EDIT:

I decided to roundover everything with 3/8", including ports!

Last edited by mlah384; 11-18-2014 at 03:56 AM.
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post #27 of 34 Old 11-18-2014, 03:55 AM - Thread Starter
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Updated with pics! Post number 6
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post #28 of 34 Old 11-18-2014, 05:56 AM
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One easy way to prevent mdf blowout when using a hole saw, is to make your center mark, then drill straight through with a small drill bit, so there's a starting hole on the inside. Take the hole saw, and start drilling on the inside just enough to cut the circle through the outer layer, and then finish drilling from the outside. That way the circle is already cut, and there's nothing to tear when the hole saw comes through quickly at the end
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post #29 of 34 Old 11-18-2014, 08:21 AM
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Finished product looks great!! But the bigger question is how do they sound!?

Check out my End-Table Marty Build
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post #30 of 34 Old 11-23-2014, 08:33 PM - Thread Starter
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