2x sealed Dayton Ultimax UM18-22 build thread - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 28 Old 11-12-2018, 01:50 PM - Thread Starter
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2x sealed Dayton Ultimax UM18-22 build thread [img heavy]

Yes, it's another one of those, not very exciting. But, I figured I'll throw up some pictures because why not - and, to give people an idea of what that Duratex paint looks like.

I bought two flat pack + UM18-22 kits from PartsExpress a couple of months ago. The lack of an amp (research here) and no dedicated build space meant the project was left idle. Also, the current HSU Research ULS15-MK2 was doing a really good job, especially paired with a MiniDSP.

Now that we've in a house, I have some space, so decided to finally assemble / build the boxes.

I made two mistakes.

The first one was the severe / serious one. In my haste, I figured I could balance an enclosure on top of a trolley to be able to paint all sides at once. It worked, until it didn't... with a loud bang heard from the living room, the box fell down on the concrete floor in the garage and dented a corner. Upon closer examination and knocking on the walls, it appeared one wall had gotten unstuck from the rest of the enclosure as the note was much deeper when knocking on it.
I decided to, instead of trying to take it apart, add glue on the seams wherever possible and use L brackets and screws to secure it in place. Now it sounds much better, we'll see how it actually works once I start testing.

The second mistake I made was installing the driver without any stuffing in the box. I thought I was all done, looked around and saw a bag of white fluff... great.

From my experience:

Pros
  • Looks really sleek when finished (I used a roller for the paint)
  • Paint dries super fast
  • The cones on the subwoofers have a nice carbon fiber look without a dust cap
  • The boxes aren't that much bigger than the HSU. They are a bit taller, yes, but not much wider.

Cons
  • It would be nice if Parts Express sold a complete kit, with the screws, glue, terminals, speaker wire, paint etc. for a bit of a discount if you buy a complete kit
  • The finished boxes are quite heavy
  • ... but the driver itself is not that heavy

How does it all sound? I don't know. My amplifier is not here yet (I hope it makes it before Thanksgiving...!). I ordered it from BH Photo Video on 10/20, and it still says back ordered. Crest Audio Pro-LITE 7.5 Professional Power Amplifier (7500W, 2RU)

Once it arrives, I'll pair it up with MiniDSP and follow the guide(s) out there on how to properly EQ two subs. Then post graphs, obviously!

For now, a quick graph from the current HSU setup will have to do. The signal chain is Marantz SR5010 AVR > MiniDSP 2x4HD > sub. Ignore the sub running hot compared to the mains, I know!




Now the Dayton build pictures. Scroll past these to see the measurements (yes, the amp arrived!)








































Measurements



Left sub only - no EQ (followed by group delay)




Right sub only - no EQ (followed by group delay)






Both subs EQ'd individually with REW one by one (not using MSO, still learning), followed by GD graph. No Audyssey.






As above, but with Audyssey, followed by GD graph.




LG OLED55C6P calibrated
Denon X4400H 5.2.4
Denovo HTM-10
HSU Research surrounds
2x18" Dayton Ultimax sealed < Pro-LITE 7.5 amp < MiniDSP 2x4 HD

Last edited by Fackamato; 11-26-2018 at 08:50 PM.
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post #2 of 28 Old 11-12-2018, 05:03 PM
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looks like they turned out great despite jumping off the handcart.
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Listen. It's All Good.
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post #3 of 28 Old 11-12-2018, 05:23 PM - Thread Starter
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Thanks! They Duratex paint is quite good, I recommend it if you're looking for this kind of finish. 2 coats are on here.
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looks like they turned out great despite jumping off the handcart.
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post #4 of 28 Old 11-12-2018, 06:07 PM
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Thumbs up Nice job!

Fackamato do you know the approximate weight of each of these bad boys?

I guess I never realized these aren't complete! Does their website / somewhere list the stuff you need to add to finish the assembly? (screws, glue, terminals, speaker wire, paint etc.)

Keep us posted as the amp arrives & your cat explodes etc. etc.
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post #5 of 28 Old 11-12-2018, 07:07 PM - Thread Starter
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Quote:
Originally Posted by LARUE View Post
Fackamato do you know the approximate weight of each of these bad boys?

I guess I never realized these aren't complete! Does their website / somewhere list the stuff you need to add to finish the assembly? (screws, glue, terminals, speaker wire, paint etc.)

Keep us posted as the amp arrives & your cat explodes etc. etc.
They are complete! I just meant it'd be nice if there was a complete kit, not just drivers and cut MDF.

As soon as I unpack the scale I'll weigh them. Bit rough math puts them at around 106lbs plus paint, stuffing, screws, wood filler, cables, connectors... Probably 110lbs or so each.

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Denon X4400H 5.2.4
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HSU Research surrounds
2x18" Dayton Ultimax sealed < Pro-LITE 7.5 amp < MiniDSP 2x4 HD
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post #6 of 28 Old 11-13-2018, 05:29 AM
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looking good...!!!

Receiver : Pioneer Elite SC-95
Front Speakers: 3 DIYSG 1099's
Surround Speakers:2 DIYSG Volt 10's Atmos: 2 DIYSG Volt 6's
Subwoofers: Dual Dayton HO 18's in Cyclops enclosures w/Inuke 6000 DSP
Nearfield: 2 Dayton HO 15's + MBM: 2 PA 460's (VBSS) w/Inuke 6000DSP
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post #7 of 28 Old 11-14-2018, 05:05 PM
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How is that amp doing powering the UM18s?


I currently have two UM18s sealed (basically the same exact setup as you) with an inuke 6000DSP. I want to add two more UM18s but I need moar powah! Thinking of the Crest you bought or a speakerpower 6000HT plate amp to power all 4 and ditch the inuke.
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post #8 of 28 Old 11-19-2018, 03:01 PM
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follow up

Post an update once you get your amp!

FWIW my inuke 6k fried three UM18s once the inadequate 15 amp breaker that kept tripping was replaced with a dedicated 20amp circuit. And played sub torture tracks. Loud. And long.

(I now have Ficar Audio SSD neo 18s instead.)

If bad sound were Faital, good sound would be almost impossible
Killed two Mach5 21s and three UM-18s (and counting?)
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post #9 of 28 Old 11-19-2018, 10:33 PM
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Quote:
Originally Posted by Fackamato View Post
Yes, it's another one of those, not very exciting. But, I figured I'll throw up some pictures because why not - and, to give people an idea of what that Duratex paint looks like.

I bought two flat pack + UM18-22 kits from PartsExpress a couple of months ago. The lack of an amp (research here) and no dedicated build space meant the project was left idle. Also, the current HSU Research ULS15-MK2 was doing a really good job, especially paired with a MiniDSP.

Now that we've in a house, I have some space, so decided to finally assemble / build the boxes.

I made two mistakes.

The first one was the severe / serious one. In my haste, I figured I could balance an enclosure on top of a trolley to be able to paint all sides at once. It worked, until it didn't... with a loud bang heard from the living room, the box fell down on the concrete floor in the garage and dented a corner. Upon closer examination and knocking on the walls, it appeared one wall had gotten unstuck from the rest of the enclosure as the note was much deeper when knocking on it.
I decided to, instead of trying to take it apart, add glue on the seams wherever possible and use L brackets and screws to secure it in place. Now it sounds much better, we'll see how it actually works once I start testing.

The second mistake I made was installing the driver without any stuffing in the box. I thought I was all done, looked around and saw a bag of white fluff... great.

From my experience:

Pros
  • Looks really sleek when finished (I used a roller for the paint)
  • Paint dries super fast
  • The cones on the subwoofers have a nice carbon fiber look without a dust cap
  • The boxes aren't that much bigger than the HSU. They are a bit taller, yes, but not much wider.

Cons
  • It would be nice if Parts Express sold a complete kit, with the screws, glue, terminals, speaker wire, paint etc. for a bit of a discount if you buy a complete kit
  • The finished boxes are quite heavy
  • ... but the driver itself is not that heavy

How does it all sound? I don't know. My amplifier is not here yet (I hope it makes it before Thanksgiving...!). I ordered it from BH Photo Video on 10/20, and it still says back ordered. Crest Audio Pro-LITE 7.5 Professional Power Amplifier (7500W, 2RU)

Once it arrives, I'll pair it up with MiniDSP and follow the guide(s) out there on how to properly EQ two subs. Then post graphs, obviously!

For now, a quick graph from the current HSU setup will have to do. The signal chain is Marantz SR5010 AVR > MiniDSP 2x4HD > sub. Ignore the sub running hot compared to the mains, I know!




Now the Dayton build pictures:







































How much Polyfill did you use?

Equipment List: Benq W6000, Darbee DVP-5000S Video Processor, JKP Affinity 100 inch 16x9 .9 gain reference screen, Marantz SR7013 Receiver, 3-Marantz Ma700 and 2-Ma6100 monoblocks, 7.4.2 Atmos, B&W Nautilus 805 front speakers, B&W Nautilus HTM2 center speaker, Volt 6 Atmos Speakers, Mirage HDT-R side speakers, Jamo THX surround one rear speakers, 2 PSA S3600I'S, and 2 UM18-22/iNUKE6000DSP DIY subs.
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post #10 of 28 Old 11-24-2018, 07:28 PM - Thread Starter
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Quote:
Originally Posted by Mike Butny View Post
How much Polyfill did you use?
Ended up being different for each box. Maybe 2-4lbs in the first one, and around 2lbs in the second one.

LG OLED55C6P calibrated
Denon X4400H 5.2.4
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2x18" Dayton Ultimax sealed < Pro-LITE 7.5 amp < MiniDSP 2x4 HD
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post #11 of 28 Old 11-26-2018, 09:02 PM - Thread Starter
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Now with graphs added to the first post.

Still using REW only - haven't mastered Multi Sub Optimizer yet...

LG OLED55C6P calibrated
Denon X4400H 5.2.4
Denovo HTM-10
HSU Research surrounds
2x18" Dayton Ultimax sealed < Pro-LITE 7.5 amp < MiniDSP 2x4 HD
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post #12 of 28 Old 11-27-2018, 06:23 AM
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I must say the point the kits should include glue, stuffing etc is a great one. They do offer closer to that with an amp included but not many want that.

It is a pain figuring the connectors, terminals, stuffing screws and glue when you do a first build. That feedback is good enough imo you should suggest it to PE.

They sell everything needed...but dont specify it all even though it is a straightforward sealed kit. Very good points.


And nice build. Everybody makes a few mistakes...admitting it to others reflects a very good personality imo. Nicely done.
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post #13 of 28 Old 11-27-2018, 06:27 AM
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Quote:
Originally Posted by Fackamato View Post
Now with graphs added to the first post.

Still using REW only - haven't mastered Multi Sub Optimizer yet...
Dont worry about MSO or integration yet.

The biggest changes to sub response (better and worse) comes from moving the subs to new positions.

Great positioning will reduce the
variations in response far more than eq.

It's a long process if u do it but well worth it.

Even if positioning is limited, a foot or two in any direction can dramatically change the response.

When u find it...its audio nirvana.
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post #14 of 28 Old 11-28-2018, 06:33 AM
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What does the cat think of the new sub?
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post #15 of 28 Old 11-28-2018, 07:20 PM - Thread Starter
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Ha.They are indifferent (thankfully)
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What does the cat think of the new sub?
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post #16 of 28 Old 12-07-2018, 08:05 PM - Thread Starter
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I was wrong, they're scared. Bonus vid of excursion with Bass I Love You: https://photos.app.*******/uvzWUHhJfvPsyAg28

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post #17 of 28 Old 01-11-2019, 09:15 PM
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This is a great thread. Thanks! Waiting on delivery of the first UM18 and flat pack now.

GSG Full Marty Build: https://youtu.be/-U1deD_0j9c
UM18-22 Sealed Subwoofer Build: https://youtu.be/7ifac8Rh8gk
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post #18 of 28 Old 01-11-2019, 09:30 PM - Thread Starter
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Quote:
Originally Posted by nexus99 View Post
This is a great thread. Thanks! Waiting on delivery of the first UM18 and flat pack now.
Nice! What amp? Do you have access to EQ/DSP?

LG OLED55C6P calibrated
Denon X4400H 5.2.4
Denovo HTM-10
HSU Research surrounds
2x18" Dayton Ultimax sealed < Pro-LITE 7.5 amp < MiniDSP 2x4 HD
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post #19 of 28 Old 01-12-2019, 03:52 AM
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Quote:
Originally Posted by bebb View Post
Post an update once you get your amp!

FWIW my inuke 6k fried three UM18s once the inadequate 15 amp breaker that kept tripping was replaced with a dedicated 20amp circuit. And played sub torture tracks. Loud. And long.

(I now have Ficar Audio SSD neo 18s instead.)
Many companies make their car subs have an impedance peak near 60hz to help avoid from being burnt up by teenagers putting them in their boomer cars with multi-kilowatt amps.

Heat is proportional to: current
and to a lesser extent: watts

Since most music is >40-200hz it makes sense to have a giant peak in there to reduce current. They think it is 1-2ohms but it's actually closer to 4-30ohms in some cases. Which isn't necessarily a bad thing.

data-bass measures the impedance of all drivers tested.

Sounds like you need to be using 8-16 18's given your desired playback SPL...
To get loud you need lots of coil-area to prevent the magic-smoke from coming out. The extra cone-area helps lots too!

Keep in mind the UM-18 is 88db/w/m... just like pretty much all car/HT subs.

It's no array of 98db/w/m pa-woofers... that extra 10db of headroom can make a difference in watts, and thus current and thus heat. PA woofers are a nominal 8-ohms which helps further reduce current draw through the coil wires.
With 8-ohms nom and 98db/w/m they are MUCH harder to burn up in general,
and their impedance peak is even higher still, often 16-60ohms etc.
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post #20 of 28 Old 01-12-2019, 08:49 PM
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Quote:
Originally Posted by BassThatHz View Post
Many companies make their car subs have an impedance peak near 60hz to help avoid from being burnt up by teenagers putting them in their boomer cars with multi-kilowatt amps.

Heat is proportional to: current
and to a lesser extent: watts

Since most music is >40-200hz it makes sense to have a giant peak in there to reduce current. They think it is 1-2ohms but it's actually closer to 4-30ohms in some cases. Which isn't necessarily a bad thing.
@BassThatHz - you know it it your fault I blew all those subs. make the car go boom, Bass I love you, etc. Without those....I would not have the SSD neos :-)

If bad sound were Faital, good sound would be almost impossible
Killed two Mach5 21s and three UM-18s (and counting?)
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post #21 of 28 Old 01-12-2019, 09:51 PM
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Quote:
Originally Posted by Fackamato View Post
Nice! What amp? Do you have access to EQ/DSP?
NU6000 with a minidsp 2x4HD.

GSG Full Marty Build: https://youtu.be/-U1deD_0j9c
UM18-22 Sealed Subwoofer Build: https://youtu.be/7ifac8Rh8gk
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What do you guys recommend for stuffing?

GSG Full Marty Build: https://youtu.be/-U1deD_0j9c
UM18-22 Sealed Subwoofer Build: https://youtu.be/7ifac8Rh8gk
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post #23 of 28 Old 01-13-2019, 03:02 PM
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What do you guys recommend for stuffing?
Simplest solution: pillows from walmart.

They are cheap come in multiple sizes, the are encased, so they are easy to work with and keeps the fibers out of the motor, etc.

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post #24 of 28 Old 01-13-2019, 03:30 PM
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Great job! They look awesome!
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post #25 of 28 Old 01-15-2019, 07:28 PM
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Can anyone validate the width of the UM18 sealed box? Is it 20" And like 23" tall?

GSG Full Marty Build: https://youtu.be/-U1deD_0j9c
UM18-22 Sealed Subwoofer Build: https://youtu.be/7ifac8Rh8gk
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post #26 of 28 Old 01-15-2019, 07:42 PM
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Quote:
Originally Posted by nexus99 View Post
Can anyone validate the width of the UM18 sealed box? Is it 20" And like 23" tall?
From PE: External dimensions: 23" H x 20" W x 20.75" D

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post #27 of 28 Old 01-15-2019, 07:49 PM
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just measured mine 23.5X20.5x20.25

Sony 999ES
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post #28 of 28 Old 03-10-2019, 02:33 PM
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Quote:
Originally Posted by bebb View Post
@BassThatHz - you know it it your fault I blew all those subs. make the car go boom, Bass I love you, etc. Without those....I would not have the SSD neos :-)
Basshead music is best Korea.
One isn't a true basshead until they've blow at least 1 sub.
Besides, you were gonna blow those without my assistance, you can't fix basshead.
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