Dayton Audio UM18-22 18 Sealed sub enclosure built help - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 12 Old 07-18-2019, 12:53 AM - Thread Starter
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Angry Dayton Audio UM18-22 18 Sealed sub enclosure built help

I am totally new to building DIY subs. I have order Dayton Audio UM18-22 18 and iNukeNX6000D. Can anyone please guide me about the box dimensions and the internal bracing. Where i live it was pretty hard to get these alone so cannot get the box kit form parts-express /
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post #2 of 12 Old 07-18-2019, 03:09 AM
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this one would be about 4.75 cubic feet net.

if those dimensions are no good, then they can be adjusted. anything from about 3 c.f. to as large as you want to go can work with your driver and amp.

4.75 c.f. is small enough that you most likely won't be able to overdrive the um18 on the low end with too much excursion. watch your power though and no sine waves. :-)











good luck with your project.

you are the second guy in pakistan that i put a cab design together for this week. his was a big marty though. :-)
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post #3 of 12 Old 07-18-2019, 03:33 AM - Thread Starter
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Quote:
Originally Posted by LTD02 View Post
this one would be about 4.75 cubic feet net.

if those dimensions are no good, then they can be adjusted. anything from about 3 c.f. to as large as you want to go can work with your driver and amp.

4.75 c.f. is small enough that you most likely won't be able to overdrive the um18 on the low end with too much excursion. watch your power though and no sine waves. :-)











good luck with your project.

you are the second guy in pakistan that i put a cab design together for this week. his was a big marty though. :-)
Thanks a lot .... Actually the project if for a friend of mines... i am stuck off with Klipsch spl-15... very had to get these bad boys... but will defiantly get it some day
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post #4 of 12 Old 07-18-2019, 05:48 AM
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Originally Posted by Mustafa Jaleel View Post
Thanks a lot .... Actually the project if for a friend of mines... i am stuck off with Klipsch spl-15... very had to get these bad boys... but will defiantly get it some day
I just built a pair of sealed UM18s in dimensions very similar to those John provided you (a touch larger) - They pound. Your friend should be very happy with them.

I did set the limiter on my NX3kD to ~550 watts for each driver, as modeling showed I would be over xmax at about 450 if I recall correctly.

Sub builds: Yet another Infinity 1260 build | Twins! | Modified V.B.S.S. build | UM12-22 builds | AV stand and sealed UM18s

Speaker builds: DIYSG HTM-10 build | DIYSG Volt-6 build | DIYSG Fusion-8 builds
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post #5 of 12 Old 07-18-2019, 07:04 AM
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Originally Posted by smcmillan2 View Post
I just built a pair of sealed UM18s in dimensions very similar to those John provided you (a touch larger) - They pound. Your friend should be very happy with them.

I did set the limiter on my NX3kD to ~550 watts for each driver, as modeling showed I would be over xmax at about 450 if I recall correctly.
xmax on that driver is overhang.

real xmax is up around 28mm. i'm not sure where the damage point is, but is likely way up in the 30's or so.

you can probably up your limiter somewhat. modeling for 28mm excursion at 10hz would be safe, though even higher should be fine.

also, the rest of the chain may have some rolloff, so excursion under 10hz probably won't be as high as models show.
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post #6 of 12 Old 07-18-2019, 07:12 AM
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Quote:
Originally Posted by LTD02 View Post
xmax on that driver is overhang.

real xmax is up around 28mm. i'm not sure where the damage point is, but is likely way up in the 30's or so.

you can probably up your limiter somewhat. modeling for 28mm excursion at 10hz would be safe, though even higher should be fine.

also, the rest of the chain may have some rolloff, so excursion under 10hz probably won't be as high as models show.

Excellent! I will re-model and bump up the limiter then.

Thanks for the info John!
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Sub builds: Yet another Infinity 1260 build | Twins! | Modified V.B.S.S. build | UM12-22 builds | AV stand and sealed UM18s

Speaker builds: DIYSG HTM-10 build | DIYSG Volt-6 build | DIYSG Fusion-8 builds
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post #7 of 12 Old 07-18-2019, 07:22 AM
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Originally Posted by smcmillan2 View Post
Excellent! I will re-model and bump up the limiter then.

Thanks for the info John!



Keep in mind, once the coil leaves the gap, there is still some fringe magnetic field. ( more for wider gap widths ) I'd expect the impedance to drop significantly ( regardless of frequency ) when the coil leaves the gap, towards the DCR of the driver.



Be careful approaching the limits.
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Ask your doctor if DIY is right for you. Side effects of DIY may include anxiety, elevated blood pressure, lightheadedness, rapid heartbeat, skeletal muscle flaccidity, euphoria, psychological dependence, insomnia, confusion, blurred vision, implusivity, uncontrolled or repeated movements.
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post #8 of 12 Old 07-18-2019, 12:46 PM
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ah, found it:

so...
overhang = 22mm
gap height = 12mm
coil height = 56mm

therefore, xmax as calculated as overhang + 1/3 gap = 22 + 4 = 26mm
usable is typically at about overhang + 2/3 of gap or so = 22 + 8 = 30mm
coil leaves the gap at 22 + 12mm = 34mm (this is typically what is referred to as xdam or xmech, but i don't think this driver hard bottoms at that point)

winisd is "small signal" and in reality excursion doesn't go quite as high as model, so modeling for 28-30mm in your box with your power is probably aok.

"Our listed Xmax spec is "geometric" Xmax - the coil extends above and below the top plate by this amount (22mm).Because acceptance of Klippel specs isn't quite universal yet (but getting there), we give geometric Xmax instead of BL-limited Xmax to keep out of trouble, and it's also the most conservative measure. So coil height = top plate thickness + (2*22mm).

The top plate thickness for the UM18-22 is 12mm. So the overall coil height is 56mm, or just over 2.2"."

https://www.avsforum.com/forum/155-d...l#post26312977

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post #9 of 12 Old 07-18-2019, 01:43 PM
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Quote:
Originally Posted by smcmillan2 View Post
I just built a pair of sealed UM18s in dimensions very similar to those John provided you (a touch larger) - They pound. Your friend should be very happy with them.

I did set the limiter on my NX3kD to ~550 watts for each driver, as modeling showed I would be over xmax at about 450 if I recall correctly.
I'm running 1200 watts into each of my UM18-22 drivers without any issues. I also do have 2 other subs so 4 subs sharing the load. See the Thread below as it breaks down the power numbers in a 6000DSP. I know you are using a NX3KD but the info in that thread is very useful.


https://www.avsforum.com/forum/155-d...rundown-8.html

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 LaVoce 21inch Neo DIY subs and 2 PSA 3600I'S.
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post #10 of 12 Old 07-18-2019, 01:47 PM
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Originally Posted by Mike Butny View Post
I'm running 1200 watts into each of my UM18-22 drivers without any issues. I also do have 2 other subs so 4 subs sharing the load. See the Thread below as it breaks down the power numbers in a 6000DSP. I know you are using a NX3KD but the info in that thread is very useful.


https://www.avsforum.com/forum/155-d...rundown-8.html
Are you keeping them?

Nothing right now
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post #11 of 12 Old 07-18-2019, 01:54 PM
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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 LaVoce 21inch Neo DIY subs and 2 PSA 3600I'S.
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post #12 of 12 Old 07-20-2019, 09:58 PM
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Originally Posted by LTD02 View Post
4.75 c.f. is small enough that you most likely won't be able to overdrive the um18 on the low end with too much excursion. watch your power though and no sine waves. :-)
Yes. Don't ask me how I know....

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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