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post #1 of 14 Old 08-22-2019, 01:32 PM - Thread Starter
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Online cabinet design service?

I had been hoping to find flat packs, but I have a built in entertainment center and I need a specific width and height to fit and the flat pack for Ultimax 15’s at PE is 1.5” too wide to fit.

So I need to make that up with depth, plus I wouldn’t mind having a ported cabinet(s) instead.

Is there anywhere online where I can tell them the driver I want to use and my space requirements and they can design me a cabinet with a detailed cut list, etc? I am handy enough with tools that I feel like I can build the cabinets, but I really don’t want to learn WinISD and all that...

I just need to build enclosures for two Dayton Ultimax 15’s with a max width of 18” and max height of 21”. The 3.0 cu ft can be made up from length where I have quite a bit of room to spare. If it were possible, I would actually like to go ported, however.

Anyone have pointers?


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post #2 of 14 Old 08-22-2019, 03:02 PM
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Originally Posted by Brett Hays View Post
I had been hoping to find flat packs, but I have a built in entertainment center and I need a specific width and height to fit and the flat pack for Ultimax 15’s at PE is 1.5” too wide to fit.

So I need to make that up with depth, plus I wouldn’t mind having a ported cabinet(s) instead.

Is there anywhere online where I can tell them the driver I want to use and my space requirements and they can design me a cabinet with a detailed cut list, etc? I am handy enough with tools that I feel like I can build the cabinets, but I really don’t want to learn WinISD and all that...

I just need to build enclosures for two Dayton Ultimax 15’s with a max width of 18” and max height of 21”. The 3.0 cu ft can be made up from length where I have quite a bit of room to spare. If it were possible, I would actually like to go ported, however.

Anyone have pointers?


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This is a really handy Excel sheet that does a lot of math concerning the box and cut list for a slot ported cabinet - https://www.avsforum.com/forum/155-d...alculator.html

The biggest note with WinISD is it overestimates the port length by about 15%, use 85% of whatever it says the port length should be for a tune. If you have questions as you go, post them here

Cornering the UM15 and ported boxes, it really needs more volume to shine, I think 7 cuft is where it starts getting good for that subwoofer. Not knowing much about your goals I would also suggest looking into some of the pro subs, a lot of them are designed for higher output in smaller enclosures. Some of the pro subs offer higher xmax values for digging into lower frequencies.

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post #3 of 14 Old 08-22-2019, 03:15 PM
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i would agree that 7-8 cubic feet would be much better for the um15 driver.

what is the rest of your setup? what main speakers? movies or music? how loud?

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post #4 of 14 Old 08-22-2019, 04:07 PM - Thread Starter
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Cornering the UM15 and ported boxes, it really needs more volume to shine, I think 7 cuft is where it starts getting good for that subwoofer. Not knowing much about your goals I would also suggest looking into some of the pro subs, a lot of them are designed for higher output in smaller enclosures. Some of the pro subs offer higher xmax values for digging into lower frequencies.
Yeah, no way I will have room for that. Do you have a driver you would recommend in a similar price range that would work in a hxwxd 21x18x36'ish enclosure? I had just read a lot of good things about the Ultimax15 and noted the enclosure on Parts Express came within 1.5" of fitting in the space I have available.

I have a built in entertainment center, so limited to the space and placement there.. which I know is limiting.. but it is what I have to deal with. I also already have an inuke 3000 lying about.
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post #5 of 14 Old 08-22-2019, 04:10 PM - Thread Starter
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i would agree that 7-8 cubic feet would be much better for the um15 driver.

what is the rest of your setup? what main speakers? movies or music? how loud?
Speakers are Atlantic Technology System 350THX, looking to replace the twin Atlantic Technology Subs. All movies. Just want to feel the bass in my chest in a fairly large room.

https://shop.atlantictechnology.com/...350_manual.pdf
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post #6 of 14 Old 08-22-2019, 04:57 PM
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if you can push the width by 0.05" or so to allow for the driver, this could be an option:



uses this driver:

https://www.parts-express.com/lavoce...8-ohm--293-730

which is a medium excursion "crossover" driver. it has highish efficiency like a pro audio driver and medium excursion somewhere in between a pro audio driver and a home audio sub.

it would provide pretty good output in this enclosure.

max output vs the um 15 would look something roughly like this (limited to the 99 volts that a bridged 3000 can output)

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post #7 of 14 Old 08-22-2019, 05:13 PM
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driver cutout actually extends a hair into the side panels (and port board and/or top panel depending on exact driver positioning).

















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post #8 of 14 Old 08-22-2019, 05:21 PM
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it would look something like this. :-) woofer with a port on it!



tuning would be right around 20Hz.

the driver is 8 ohm, so a pair could be run off the 3000 amp in bridged mode. you may need to employ the limiter on the amp depending on how hard you drive the subs.

if pushed too hard, the amp may power cycle. limiting Vp (peak voltage) to around 110-115 may be a safe starting point if required.

a protective high pass would be advised. 2nd order butterworth, 12db/oct, at 20Hz will keep driver excursion in check.
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post #9 of 14 Old 08-22-2019, 05:49 PM
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if you have capability to make angle cuts, triangle ports might work too.



i think 5.93" makes the cross-sectional area identical. this one shows 6.00". internal rear port spacing might be good at 2.50" instead of 2.25" with this shape of port. tuning may be a hz higher as shown. tough to say with triangle ports as there aren't enough of them to be able to calculate length and tuning with as much precision as the rectangular port.
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post #10 of 14 Old 08-22-2019, 09:52 PM - Thread Starter
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Quote:
Originally Posted by LTD02 View Post
if you can push the width by 0.05" or so to allow for the driver, this could be an option:



uses this driver:

https://www.parts-express.com/lavoce...8-ohm--293-730

which is a medium excursion "crossover" driver. it has highish efficiency like a pro audio driver and medium excursion somewhere in between a pro audio driver and a home audio sub.

it would provide pretty good output in this enclosure.

max output vs the um 15 would look something roughly like this (limited to the 99 volts that a bridged 3000 can output)

This may be a stupid question, but what commercial sub would you compare the performance of this setup to, in terms of svs, Klipsch, Hsu Research, etc.. is there a close analog in terms of spl?
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post #11 of 14 Old 08-23-2019, 01:24 AM
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This may be a stupid question, but what commercial sub would you compare the performance of this setup to, in terms of svs, Klipsch, Hsu Research, etc.. is there a close analog in terms of spl?
not really because none of those systems as far as i am aware use a high efficiency driver.

this is the pb13u for example, in 20hz mode (all ports open) from data-bass.



add 6dB to its measurements because it was measured at 2m instead of 1m.

https://data-bass.com/#/systems/5b11...9d67?_k=wtvnn3
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post #12 of 14 Old 08-23-2019, 01:37 AM
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i had to change the triangle port size in post #9 because i mis-calculated the equivalent triangle area (by half). i used one port then divided the equivalent square area by two instead of using the area of both ports and dividing the equivalent square area by two. sorry about that. :-)

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post #13 of 14 Old 08-23-2019, 04:26 AM - Thread Starter
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i had to change the triangle port size in post #9 because i mis-calculated the equivalent triangle area (by half). i used one port then divided the equivalent square area by two instead of using the area of both ports and dividing the equivalent square area by two. sorry about that. :-)
I did some additional measuring and I actually have 18 3/4 inches of width x 21' tall but I only have 27" of depth, and actually to be able to get the cabinet in and out probably closer to 23"...

The only way I can really modify the entertainment center is for width, so I could fit the Parts Express Ultimax 15 sealed enclosure reasonably easily at 19.25" x 19.25" x 20"

A pair of these AT 352PBM's are what I have now that I am not happy with, it says 35Hz, but honestly when I run a test I don't hear much of anything below 50Hz..



What's the most bang for the buck I can fit in the space I have and power with my iNuke 3000?
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post #14 of 14 Old 08-23-2019, 02:45 PM
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the 3000DSP/3000D amp has 50 volts output max per channel.

the um15 adn um18 are both either 1 or 4 ohm loads. so they would have to run 1 driver per channel at 4 ohms.

um15 is blue line in 4 cubic feet sealed per cab. 50 volts. 2 cabs, 2 pi space.

um18 is red line in 4 cubic feet sealed per cab. 50 volts. 2 cabs, 2 pi space.

the green is about 4.5 cubic feet ported and tuned to around 25hz (with 20hz high pass filter set) with the saf184.03 driver mentioned before. it is 8 ohm so two could be wired in parallel and the amp run in bridged mode. the green line shows the maximum output while limiting VA from the amp to about 1200 or so watts. that's about all it can do. you could EQ the response to be anything that you want so long as you don't exceed the green line. the behringer has dynamic eq that could allow for some change in the frequency response as the level increases in order to maximize mid-bass headroom without clipping the amp on the low end.



Another possibility could be to build relatively slim (perhaps 12-16" deep), but large volume enclosures and place them in the back or back sides of the room. that would allow you to get a lot more low end with the um drivers for pretty much no additional cost.

the orange line in the image below is the same um15 driver, same 50 volts, etc. but in 10 cubic footer cabs tuned to 18hz.



then, as further migration upstream, a couple of sealed cabs with cheap PA460 drivers could be put in 3-4 cubic foot cabs in the built-in center and crossed in around 50-60hz. that would allow increasing your crossover frequency quite a bit and give a lot more punch to your system. that would require picking up another amp though. a 1000D should be sufficient, but i always recommend the 3000D as it isn't that much more money and allows for quite bit more options.
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