Possible ported 15 Dayton Ultimax is now sealed (pics) - AVS Forum
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post #1 of 39 Old 04-05-2013, 11:22 AM - Thread Starter
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I need more. I have a 3200^3 theater room with Definitive bp8060's as mains. Their subs are pushed far as they can go at this point. I just added a LV12R and have this maxed out as well. It is just a little under what I want (for now) in this room; so I've decided to build a ported Dayton 15 Ultimax rather than to double or triple the budget. I have a 300 Watt amp to test this unit out with and I'm thinking that if it goes well, I will end up building a second and getting an ep4k or similar to power it all. I am new to winISD, but I think I'm going to go with a 6^3 ported enclosure tuned to 15Hz with 2 ports that are 3 inch diameter and 25 inches long. Any thought on how this will perform in comparison to my current setup, or suggestions on different enclosures?
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post #2 of 39 Old 04-07-2013, 06:47 AM
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Hmmm....a Dayton UM15" driver in a ported box tuned to 15hz? I LIKE THAT! I am looking forward to seeing what other people have to say about this as I have a couple of the UM15's that are setting right here waiting on their enclosures to be built!
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post #3 of 39 Old 04-07-2013, 08:31 AM
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A pair of 3" ports isnt going to provide enough port area to avoid chuffing if you go over 300 watts
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post #4 of 39 Old 04-07-2013, 08:42 AM
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Quote:
Originally Posted by Jay1 View Post

A pair of 3" ports isnt going to provide enough port area to avoid chuffing if you go over 300 watts

Jay1, WinISD shows 29-30 m/s with that setup @800W, what is generally considered the maximum velocity before chuffing becomes audible?
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post #5 of 39 Old 04-07-2013, 11:11 AM
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The UM's aren't particularly well designed for ported enclosures. They were tailored for sealed applications.

If you're dead set on ported, probably your best bet is what Dayton recommends, with a 6 cu ft box tuned to 18hz with 6 lbs of polyfill in the box. This uses dual 4 flared ports, 26" long each.

Trying to tune to 15hz is going to be a real challenge, and doesn't make all that well use of the port contribution to the overall SPL.

Dan
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post #6 of 39 Old 04-07-2013, 12:15 PM
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What seems to be the general consensus on these compared to the RSS-HF when talking about music and SQ?
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post #7 of 39 Old 04-07-2013, 06:14 PM - Thread Starter
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How much will I be loosing on the low end going with a 4 ft sealed box instead of a 6 foot ported? This is primarly used in ht.
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post #8 of 39 Old 04-07-2013, 07:05 PM
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Quote:
Originally Posted by madskaman View Post

How much will I be loosing on the low end going with a 4 ft sealed box instead of a 6 foot ported? This is primarly used in ht.
Model it both ways and compare the maximum SPL charts.

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post #9 of 39 Old 04-08-2013, 07:28 AM - Thread Starter
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I'm going with a sealed box now. 4 ft. Thank you for the advice.
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post #10 of 39 Old 04-10-2013, 11:22 PM - Thread Starter
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It's on it's way... 18x22x25 sealed 3/4 MDF.
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post #11 of 39 Old 04-11-2013, 04:54 AM
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Quote:
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I'm going with a sealed box now. 4 ft. Thank you for the advice.

Good choice.

Dan
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post #12 of 39 Old 04-11-2013, 11:37 PM - Thread Starter
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All assembled. Just drying now.
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post #13 of 39 Old 04-12-2013, 12:17 PM - Thread Starter
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Set it up today to test unstuffed and unfinished.



I couldn't be happier with it! And that's only with 300W.
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post #14 of 39 Old 04-12-2013, 12:22 PM
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Glad to hear that it worked out well!!

The dimensions you listed above, those are external dimensions correct? So your internal volume is about 4.6 cu ft?


Do you have any measurement equipment to check our frequency response? What are your impressions so far?

I'm still struggling between this driver and the Dayton RSS390HF. Decisions, decisions.

Dan
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post #15 of 39 Old 04-12-2013, 03:08 PM - Thread Starter
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I made a mistake on the measurements. The box is actually 18x20x25. My next step is to measure it and report back.
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post #16 of 39 Old 04-12-2013, 04:38 PM - Thread Starter
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What microphone should I get to measure it?
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post #17 of 39 Old 04-12-2013, 04:51 PM
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Quote:
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What microphone should I get to measure it?

UMM6 or UMIK-1 will suffice.

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post #18 of 39 Old 04-14-2013, 07:48 PM - Thread Starter
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Cleaned up the box today. Routered, filled, sanded, primed, sanded and painted with hammered black. Would have been perfect if the roller I used didn't fall apart and leave strands all over the front (of course it would be the front). Back, top and sides look great. Looks like I'll be sanding some more soon.


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post #19 of 39 Old 04-15-2013, 08:34 PM - Thread Starter
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Final paint. Sanded the fibers out of the hammered paint and rolled on some satin black. Microphone on its way.
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post #20 of 39 Old 04-16-2013, 08:34 AM - Thread Starter
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I'm going to stuff the box tonight and I have a couple questions on what to use and how. I have foam left over from a mattress that I trimmed down. It has a memory foam layer (2 inch) and two other nonmemory foam layers. Which foam would be best to use? Can I cut this down and use it to line the walls? Can I cut this down to smaller bricks and throw them in as well? Should I glue this down on the walls?
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post #21 of 39 Old 04-16-2013, 09:01 AM
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Quote:
Originally Posted by madskaman View Post

I'm going to stuff the box tonight and I have a couple questions on what to use and how.
What's the Qtc of the cab?

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post #22 of 39 Old 04-16-2013, 09:17 AM - Thread Starter
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I'm not sure. I'll have to check tonight, but the volume is 3.9.
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post #23 of 39 Old 04-16-2013, 12:36 PM - Thread Starter
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Looks like the qtc is .818
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post #24 of 39 Old 04-16-2013, 01:21 PM
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Quote:
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Looks like the qtc is .818
Fill it up with pillow stuffing. That should get it down to .7.

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post #25 of 39 Old 04-16-2013, 10:33 PM - Thread Starter
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Stuff it tonight with almost 4 pounds of pillow guts and installed the feet. Just rocking out right now and loving it!
Thank you for the help. I'll report back when I get some measurements.
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post #26 of 39 Old 04-17-2013, 09:50 AM
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I think four pounds of stuffing may be too much... Most postings I see recommend one pound or so...

If it's not a BIG screen, it's not a theater...
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post #27 of 39 Old 04-17-2013, 10:22 AM - Thread Starter
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What should I listen for to tell if its too much?
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post #28 of 39 Old 04-18-2013, 09:45 AM
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It's sealed, so the audible variations are sublte as you vary stuffing density. If you put 4 lb. in 4 cu ft, you have a 1 lb.cu ft density - speaker level of fill. Subs are frequently stuffed much denser; Dickason's LDC shows data for a variety of stuffing combinations and density levels, up to 4 lb.cu ft, with benefical impact on LF response. Conversely, Bill's aiming you at a stuffing density that gives the most linear response, 0.7 Qtc, and my simulation says that requires "heavy fill" so I doubt you'll add too much!

When starting with an undersize box (empty Qtc >>0.7), too little results in boomy bass, too much... hard to have too much as response just get smoother below 0.7...

Since I have a Umax 15 simulation, I've attached Unibox results for "light fill" (which is less than "walls covered?") with Qtc = 0.84.

and "heavy fill" with Qtc = 0.71


Fb is lower with heavy fill, but F3 higher... light fill has a 0.5dB peak at ~60Hz that's potentiall the most audible aspect... higher Qtc level become quite peaked and audible. Like I said, subtle...

HAve fun,
Frank
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post #29 of 39 Old 05-08-2013, 12:28 PM - Thread Starter
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I got my mic over the weekend and was able to take some measurements. This is with a heavy fill. I think I'm gonna take some out. Also I have a spike in it. I think it maybe due to the amp I'm using. I'm gonna try a different one and see if it evens out.

No smoothing


With smoothing
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post #30 of 39 Old 05-08-2013, 01:06 PM
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"I'm going to stuff the box tonight and I have a couple questions on what to use and how. I have foam left over from a mattress that I trimmed down. It has a memory foam layer (2 inch) and two other nonmemory foam layers. Which foam would be best to use? Can I cut this down and use it to line the walls?"

another guy used foam around the walls and the bass sucked. apparently the foam was compacting with the air pressure just like a very lossy box would. he removed it and bass went tight again.

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