Marty Variant - Dual Ports - UM18 - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 17 Old 08-16-2016, 08:39 AM - Thread Starter
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Marty Variant - Dual Ports - UM18

I had been reading about DIY subs for months in preparation of building something to fit into my new theater. Of all the great builds I looked at I kept going back to the marty, the idea of 2 18's in my small room was just too good to pass up. Initially I had planned on a minimarty build as that would fit into my plans without modification but as I built my front stage I realized I needed to tweak the design. So if I was going to tweak it I may as well make something to my exact specs and use the full space. Being a beginner I read as much as I could and came up with a design I thought would work. Not wanting to mess anything up I reached out to the community to get some help.

Big thanks to @LTD02 for graciously checking out my design - what a great asset to the community!

Background/Equipment
Room Size: 9' (W) x 16' (L) x 8' (H)
Acoustical Treatments (Planned): 1st reflection absorbers & Linacoustic to listening height. May try riser bass trap.
Drivers x2: Dayton Audio UM18-22
Amp: iNuke 6000dsp
Calibration: REW planned and will take measurements as I proceed with room build to see the changes

Design/Location

Wood: 3 sheets 3/4" MDF
External Dimensions: 35" (W) x 30" (D) x 24" (H)
Volume ~ 11ft^3
Port Length: 36"
Port Size x2: 3" x 11.25"
Tune: 17Hz





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post #2 of 17 Old 08-16-2016, 08:40 AM - Thread Starter
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MDF Prep

Cutting the MDF was not too bad with the track saw. I specifically bought this for my theater build. While the track made nice straight cuts the real benefit was the dust port on the saw.



All cut up and ready to go



Measuring port length




Full Disclosure. I f'ed up on one of my measurements. I actually had it right but put it into cutlist wrong. Now while I am new to DIY subs I am not new to construction so I was a bit upset with myself. Now I could have run out and got another sheet of MDF but that would have been a royal pain since I had these delivered and it is not easy for me to fit a sheet in my truck. So I ended up using a biscuit joiner to correct my mistake. I don't think there will be a strength issue since, besides the biscuits, I have the ports running perpendicular to the cut.

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Last edited by frogers935; 08-16-2016 at 08:53 AM.
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post #3 of 17 Old 08-16-2016, 08:40 AM - Thread Starter
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Assembly

Assembly was straight forward. I did use brad nails and some screws in a few locations.



I used screws in the back for the top section of the ports



Bit O black paint

https://www.avsforum.com/forum/attach...1&d=1471368528

I bought and used the jasper jig for the driver cutout. I am cheap and initially was just going to make my own but in the end spend the money for the jig - time wise was definitely worth it.



Front going on

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Last edited by frogers935; 08-16-2016 at 10:33 AM.
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post #4 of 17 Old 08-16-2016, 08:41 AM - Thread Starter
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Driver Test Fit

I used 1/4-20 tee nuts pressed into some scrap wood for driver attachment. I used wood glue to get the pieces tacked in then came back with some construction adhesive.



Driver test fit. I carefully glued in the wood with the driver in place to keep everything aligned.




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Last edited by frogers935; 08-16-2016 at 10:38 AM.
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post #5 of 17 Old 08-16-2016, 08:41 AM - Thread Starter
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Bracing

I used left over MDF cut to 1" strips for bracing.



I tried to cut the strips so they would friction fit into the box. I then tacked them in from the outside with nails. Initially I was measuring on the outside to get it exact but found it could be done fairly easily by just eye-balling it, I only missed a few times.



Bracing all in





Secured with construction adhesive



Final driver test fit

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Last edited by frogers935; 08-16-2016 at 10:55 AM.
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post #6 of 17 Old 08-16-2016, 08:42 AM - Thread Starter
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Foam & Paint

I used 2" bed topper to line the box and 3M spray adhesive to secure it.





I had a dilemma on finishing these. They are behind my screen so will not be seen but I did feel a need to properly finish them i.e. round over the edges, fill holes, prime, etc... In the end the weather (98° w/heat index 105+) dictated it and I ended up throwing on some flat black to the fronts.

Good 10' paint job

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Last edited by frogers935; 08-16-2016 at 11:02 AM.
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post #7 of 17 Old 08-16-2016, 08:43 AM - Thread Starter
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Wiring & Install

Speakon wired up and had my neighbor help me move these to the basement - probably last time he will offer to help me.





Final product



And firing them up...





I plan on getting a mic and taking measurements over the next month or so...hoping to get some local help in figuring it all out. Initial results with music are very impressive, I can't wait to get a movie going.
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Last edited by frogers935; 08-16-2016 at 11:12 AM.
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post #8 of 17 Old 08-16-2016, 09:22 AM
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post #9 of 17 Old 08-16-2016, 11:07 AM - Thread Starter
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Thanks @Broke EF I have been following both your sub and room build thread both are very inspiring.
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Last edited by frogers935; 08-16-2016 at 11:13 AM.
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post #10 of 17 Old 08-16-2016, 11:33 AM
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Awesome setup! Should sound fantastic!
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Check out my End-Table Marty Build
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post #11 of 17 Old 08-16-2016, 11:36 AM
 
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Great job. Love all the pics.
How do you like thr cinema 8 speakers? I keep wanting to get a pair for the living room.
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post #12 of 17 Old 08-16-2016, 11:47 AM
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Thanks for great effort with the pics, should bring shiggles to anyone in front of it

also, a less than OCD garage shows a creative mind . . a little chaos is O.K!

my concern would be the "breathing room", ventilation, for your AVR and amp stack

the "'heatsink" for the inuke6k is the bottom sheet metal of the case.
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post #13 of 17 Old 08-16-2016, 01:46 PM
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awesome stuff frogers935


not sure if the 'final' pic is the final rig, but the sound will be much improved if that cavity can be filled up with some fiberglass or rockwool batting, speakers and subs moved to flush with front, and solid panels covered with some sort of absorption material on front inserted to keep all sound radiating forward. something like this:


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post #14 of 17 Old 08-16-2016, 06:40 PM
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Quote:
Originally Posted by frogers935 View Post
Thanks @Broke EF I have been following both your sub and room build thread both are very inspiring.
WOW, Thank you for the kind words! Things like this make me want to upgrade just to keep it all going


Sean
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post #15 of 17 Old 08-16-2016, 11:18 PM
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What's in the drywall soffit that's framing the speakers and subs? Are those bass traps or covering up some structural parts in the room?

Sent from my GT-I9505 using Tapatalk
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post #16 of 17 Old 08-17-2016, 08:22 AM - Thread Starter
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Spoiler!

Thanks!

Spoiler!


From the limited use (music only) with the Cinema 8 I really like them. I am not an audiophile and my previous speakers were not that great so can't really compare them too much. I will say they are very clear and I was surprised at how much bass I got out of them. I will follow up with impressions once I get the room treatments up and do a full calibration. Also I am impressed with the volt 6.


Spoiler!


Thanks for the feedback I did not know the main heatsink was on the bottom. My current setup is not my final configuration not sure where I will have everything I get my other equipment in. I will be keeping the sides and back off of the rack and may possible install some fans in the top - being in my backroom it stays cool year round. I will probably end up putting some thermocouples in the racks at a few points too.

It's funny while I was never OCD with my garage it was much neater before I had kids, not that they make a big mess just my time is so limited I end up doing work and then minimal clean up.

Spoiler!


Thanks for dropping in and the feedback. It is not my final configuration but I was only planning on doing linacoustic on the walls of the cavity. I can easily fill the cavity with rockwool/rockboard if that will help.

Spoiler!


The area where the speakers are is structural. I needed access behind the front wall. Here is my build thread which has some pictures.

Spoiler!


Well deserved. Its cool builds and seeing others documented progress that really motivates me to keep moving through the less desirable parts of the build.
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post #17 of 17 Old 08-28-2016, 11:56 AM - Thread Starter
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How does this look?

I lined the walls with Rockboard filled the cavity with regular roxul then used more Rockboard around the speakers.

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