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post #1081 of 1139 Old 10-02-2014, 07:37 PM - Thread Starter
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The prototype posted a long time ago was the ported 12". This one is just scaled up a bit bigger with some minor assembly changes to make it easier. Hopefully no questions about cost because I won't answer those.


The box comes in around 75-80lbs if I recall. Should be a beast. I'm still debating if there should be a small roundover around the port exit or not. If it's done, veneering the front wouldn't be easy.

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post #1082 of 1139 Old 10-02-2014, 07:38 PM
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Hi Erich H !

What is HxWxL of port ? ,,, and of Ext Enclosure

Thanks!

Last edited by randyc1; 10-02-2014 at 07:45 PM.
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post #1083 of 1139 Old 10-02-2014, 07:48 PM
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Nice design. For diy the crowd tends to want bigger. The maximus mentality . I love my 3 microsubs which are virtually the same size.
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post #1084 of 1139 Old 10-02-2014, 07:49 PM - Thread Starter
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Quote:
Originally Posted by randyc1 View Post
Hi Erich H !

What is HxWxL of port ?


I don't have it in front of me, but I think it was 2.15" x 14" x 35" long. Modeling says it should be tuned at 22hz, but it will likely be lower due to how slot ports work.

The port was designed so the vertical section could be cut down 3" or so to easily fit a plate amp and still have tuning at 23hz......but not change assembly at all.
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post #1085 of 1139 Old 10-02-2014, 08:09 PM
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It looks like the port rails could be made in one piece instead of two, which would make assembly even easier. Unless that adds a little bit of play for human error?

Otherwise, looks about perfect.
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post #1086 of 1139 Old 10-02-2014, 08:33 PM - Thread Starter
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Port rails can't be made as one piece. A router uses a circular bit, so inside angles have roundovers that are the same diameter as the bit. The edge of piece of wood with a 90 degree cut won't lay in an inner angle that has that roundover.

The only way a one piece rail would work without having air leaks would be to cut it with a jig saw or similar tool. So it's better to make the port rails into 2 pieces that can be assembled flush up against the other parts so there are no air leaks.

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post #1087 of 1139 Old 10-02-2014, 08:46 PM
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it has been a long time since erich and I collaborated on this one, so I don't remember exactly all the constraints. for its size, it is fairly well optimized. the driver is a nice driver and isn't too much money. the tuning point will probably come in around 21hz. at this size, one wouldn't want to tune much lower because there would either have to be a tradeoff in port air velocity, which may give rise to chuffing, or extending the ports, which then lowers first port resonance as well as taking volume away from the cab itself. the driver excursion is under control as is power limit with 500 watts. would be a nice one for somebody who is looking to do a medium sized, plate amp based, sub or two. here is the winisd at 500 watts.


erich did a nice job on putting together an easy to assemble enclosure with a fairly traditional form factor.

nice work!


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Last edited by LTD02; 10-02-2014 at 08:50 PM.
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post #1088 of 1139 Old 10-02-2014, 09:17 PM
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Quote:
Originally Posted by Erich H View Post
AVS Forum member LTD02's contribution: 'Erich, put a 15" Dayton HO subwoofer in a box netting 4cuft, tune it around 20-22hz with some decent porting.......enjoy'.

AVS Forum member Erich H's contribution: 'Thanks LTD02, I'll work on a neat slot port design that can be assembled super easy by anyone.'

CNC's contribution: Some sweet cuts for some sweet flat packs.


That team work led to this:

Without front baffle:




Front baffle with no roundover:



Looks great! Will there be a non-roundover version available for those of us that like the Borg look?


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post #1089 of 1139 Old 10-02-2014, 09:52 PM
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the seam free front panel is very nice

Display 2013 Samsung 75" UN75F6300 TV Media Xbox One S, Dune Solo, QNAP TS-453A NAS
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post #1090 of 1139 Old 10-03-2014, 07:45 AM
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How much net volume does the driver see in this prototype?
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post #1091 of 1139 Old 10-03-2014, 07:49 AM - Thread Starter
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Just a bit over 4cuft. This is basically LTD02's microcube, just with a tad bit more volume and a slightly lower tuning.

I haven't looked around to see what other 15's will work in this. I think someone said a Lab15 will work in this as well.

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post #1092 of 1139 Old 10-03-2014, 07:50 AM
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I'm curious, would putting roundovers on ports be any benefit? My thought is: smooth corners for air to have less resistance moving in and out? kinda like you do for intakes on race cars...
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post #1093 of 1139 Old 10-03-2014, 07:57 AM
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sure. http://www.subwoofer-builder.com/flare-testing.htm


as a practical matter, most folks don't put big roundovers on slot ports and they seem to work ok that way.

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post #1094 of 1139 Old 10-03-2014, 08:07 AM
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the lab 15 would work well as would the alpine swr15.


the drivers with the lower strength motors might not do as well, the um15 comes to mind.
the Dayton dvc385 is probably borderline.


also, just be careful to note the Dayton 390HO NOT the 390HF is the driver to get.

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post #1095 of 1139 Old 10-03-2014, 08:27 AM
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Is it approximately a 22" cube?

 

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post #1096 of 1139 Old 10-03-2014, 08:30 AM - Thread Starter
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LTD02, would you just recommend the 500 watt BASH plate amp for all of those models?


pcb, I believe it was 21" wide, 23" high, 23.75" deep with the double baffle.

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post #1097 of 1139 Old 10-03-2014, 11:16 AM
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sort of depends on the driver. if folks want a plate amp based sub, that one seems fine. (I forget what the internal e.q. in it is, that would have to be double checked). if going with two or more, a stand alone amp might make more sense, but they aren't perfect either, just a different set of tradeoffs.


edit: looks like it is only a couple of db of boost in the 30hz region with a fairly low q, so that would be fine.

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post #1098 of 1139 Old 10-03-2014, 11:36 AM
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Quote:
Originally Posted by LTD02 View Post
the lab 15 would work well as would the alpine swr15.


the drivers with the lower strength motors might not do as well, the um15 comes to mind.
the Dayton dvc385 is probably borderline.


also, just be careful to note the Dayton 390HO NOT the 390HF is the driver to get.
How would the old AV15H drivers fare in that box?

http://www.hometheatershack.com/foru...kers-av15h.wdr

Need to figure out ported boxes and WinISD one of these days.

 

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post #1099 of 1139 Old 10-03-2014, 12:59 PM
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Erich,

Have you considered larger & shallower Stonehendge like enclosure for 15" drivers?

This would allow lower tune for extended shelf alignment. Matt just built a pair like this using DVC385-88 drivers. ~5cu.ft w/ 15Hz tune.

My new year’s resolution: Dual Dayton DVC385 ported build / DIY HT speaker / room acoustics upgrade!

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post #1100 of 1139 Old 10-03-2014, 01:09 PM - Thread Starter
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That's pretty close to the net volume of the Stonehenge, I would just need to get a different baffle for it.
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post #1101 of 1139 Old 10-07-2014, 11:04 PM
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Erich,
Do you still have any of your sealed 4cuft enclosures with the woofer cutout for the si drivers ?
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post #1102 of 1139 Old 10-08-2014, 06:12 AM - Thread Starter
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In a couple weeks.

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post #1103 of 1139 Old 10-08-2014, 06:55 AM
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I have a couple MFW-15 I might try in those boxes.
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post #1104 of 1139 Old 10-08-2014, 09:26 AM
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I have a couple MFW-15 I might try in those boxes.
I have 8 of the MFW-15 drivers. I was originally and still may build 4 sealed dual opposed boxes with them. I think the driver would work well in this ported box, size and tuning seem to be very close to the original offered by AV123. I may order a couple of these boxes when available, such a nice designed box!
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post #1105 of 1139 Old 10-08-2014, 09:58 AM
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Something I wonder about is if Erich were to sit still for a week, would that drop in energy expenditure be measurable from space?
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post #1106 of 1139 Old 10-08-2014, 12:32 PM
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I think they could measure it. I am pretty sure global warming would end as a byproduct of less friction from his shoes.
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post #1107 of 1139 Old 10-09-2014, 10:12 AM
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How about a vented design for Dayton Ultimax 15? I bought the 3.0 cu ft sealed box from PE, but have always wondered how it'd sound in a vented design powered by a SA1000 amp.
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post #1108 of 1139 Old 10-09-2014, 01:45 PM
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How about a vented design for Dayton Ultimax 15? I bought the 3.0 cu ft sealed box from PE, but have always wondered how it'd sound in a vented design powered by a SA1000 amp.
I would be interested in such a design as well. I already have (1) UM in a 3' knockdown, I would like another. It would rock with my 3000 dsp.
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post #1109 of 1139 Old 10-09-2014, 08:07 PM
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I would be interested in such a design as well. I already have (1) UM in a 3' knockdown, I would like another. It would rock with my 3000 dsp.
The UM15 for a vented enclosure needs about as much volume as many other 18" drivers like the SI, UXL, etc. You could see if Erich could offer the Stonehenge enclosure with the cutout for a 15" driver instead of an 18" and the volume would work out pretty well for the UM15.
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post #1110 of 1139 Old 10-12-2014, 12:33 AM
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Thank god I found this topic

DIY projects when you live in an apartment is nearly impossible
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