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Forum: DIY Speakers and Subs   01-28-2017, 08:31 AM
Replies: 677
Views: 16,465
Posted By JackNC
Is there enough depth in the box to downfire the...

Is there enough depth in the box to downfire the woofer into a slot that exits out the front?
Make it a "V" shaped slot where the point of the V goes to the center of the back edge of the woofer...
Forum: DIY Speakers and Subs   01-16-2017, 09:38 AM
Replies: 968
Views: 42,452
Posted By JackNC
You want overkill. That is why you are asking;...

You want overkill. That is why you are asking; you want to be sure:)
But as to nearfield, it depends on how near the drivers are to your driver. SPL doubles each time you halve the distance to...
Forum: DIY Speakers and Subs   12-10-2016, 03:04 PM
Replies: 30
Views: 639
Posted By JackNC
The difference between NWCs design and one using...

The difference between NWCs design and one using a direct radiator midwoofer is the pattern control freqsuency is determined by the horn size rather than the woofer size. With a conventional SEOS...
Forum: DIY Speakers and Subs   11-21-2016, 09:05 PM
Replies: 4
Views: 184
Posted By JackNC
what radius do you want to bend it on? Draw it...

what radius do you want to bend it on? Draw it to scale, drawing a radius for each kerf. If your kerfs aren't squeezed shut on the inside edge, then you should be able to do it.
Forum: DIY Speakers and Subs   11-02-2016, 08:45 AM
Replies: 417
Views: 9,764
Posted By JackNC
I'm with you so far but are those 16 TRS line...

I'm with you so far but are those 16 TRS line outs from the 16A balanced?
I wouldn't go single ended with a computer in the loop and high efficiency speakers!
Forum: DIY Speakers and Subs   10-27-2016, 03:09 PM
Replies: 144
Views: 13,152
Posted By JackNC
the problem with that long throat adapter,, or an...

the problem with that long throat adapter,, or an exponential horn in general, is that it has a cutoff frequency below which it won't give any output. This one is designed for horn loading probably...
Forum: DIY Speakers and Subs   10-27-2016, 02:22 PM
Replies: 144
Views: 13,152
Posted By JackNC
I agree if it is the version with the really long...

I agree if it is the version with the really long throat/throat adapter it might not be suitable. but if not, its worth at least serious thought. you are the guy that owns the horns and has them to...
Forum: DIY Speakers and Subs   10-27-2016, 01:04 PM
Replies: 144
Views: 13,152
Posted By JackNC
I would be tempted to "glue" woofers onto the...

I would be tempted to "glue" woofers onto the sides or top and bottom of that jbl2360a horn, as close to the apex as possible, and make a 2-way synergy with the EV DH1A CD. You may not be able to...
Forum: DIY Speakers and Subs   10-08-2016, 12:52 PM
Replies: 22
Views: 477
Posted By JackNC
You should consider the AE TD15H over the TD15M...

You should consider the AE TD15H over the TD15M if you are crossing at 300Hz. (Right, John?) That is more or less how I'm using mine and they give every sign of being able to play higher if I needed...
Forum: DIY Speakers and Subs   09-30-2016, 08:45 AM
Replies: 14
Views: 448
Posted By JackNC
6 cu.ft. isn't nearly enough volume for that...

6 cu.ft. isn't nearly enough volume for that driver for a vented sub application. To see what I mean, try modelling it in 12 cu.ft you will get a much flatter response. I haven't looked closely...
Forum: DIY Speakers and Subs   09-14-2016, 07:47 AM
Replies: 5
Views: 302
Posted By JackNC
You know the DIYSG Fusion15 Sentinel flat pack...

You know the DIYSG Fusion15 Sentinel flat pack might work for you.

http://www.diysoundgroup.com/waveguide-speaker-kits/fusion-15/fusion15-kit.html

then you would just have to deal with the...
Forum: DIY Speakers and Subs   08-26-2016, 02:30 PM
Replies: 14
Views: 440
Posted By JackNC
Benchtop is ultimately more useful than handheld....

Benchtop is ultimately more useful than handheld. Check out
http://carbide3d.com/shapeoko/
Forum: DIY Speakers and Subs   07-26-2016, 07:55 AM
Replies: 336
Views: 7,668
Posted By JackNC
Thanks for posting that. While perhaps esoteric,...

Thanks for posting that. While perhaps esoteric, its much more readable than the typical graduate textbooks on acoustics I've seen.
Forum: DIY Speakers and Subs   06-25-2016, 09:38 AM
Replies: 32
Views: 710
Posted By JackNC
(since you asked for feedback) You are leaving...

(since you asked for feedback)
You are leaving out an important octave, 17.5 to 35 Hz. Why not make it taller and then wrap the horn path around and along the top for increased horn path length?
Forum: DIY Speakers and Subs   05-19-2016, 12:18 PM
Replies: 8
Views: 251
Posted By JackNC
I think I see what you intend but a picture would...

I think I see what you intend but a picture would help.

Finding a 12" shallow mount sub that plays well in a tapped horn would be nice.

coming back under the driver might be a problem because...
Forum: DIY Speakers and Subs   05-19-2016, 09:31 AM
Replies: 8
Views: 251
Posted By JackNC
iTs going to have to be driver diameter plus 2...

iTs going to have to be driver diameter plus 2 thicknesses of plywood. Consider using two smaller drivers instead of a single large one.
Forum: DIY Speakers and Subs   05-18-2016, 06:54 PM
Replies: 8
Views: 251
Posted By JackNC
keep going, man. defintely a need for a tall,...

keep going, man. defintely a need for a tall, slim horn sub.. what does yours look like?
Forum: DIY Speakers and Subs   05-09-2016, 10:30 AM
Replies: 214
Views: 27,818
Posted By JackNC
apply a scale factor of 21/23.291 to S1, S2....Sn

apply a scale factor of 21/23.291 to S1, S2....Sn
Forum: DIY Speakers and Subs   03-07-2016, 07:05 AM
Replies: 2
Views: 112
Posted By JackNC
There are some truly amazing glues out there but...

There are some truly amazing glues out there but the only way I would use glue would be to glue in place a plywood ring to restore adequate thickness.
I've seen metal clamps spaced around the...
Forum: DIY Speakers and Subs   02-29-2016, 12:56 PM
Replies: 7
Views: 370
Posted By JackNC
At close distance, you can get destructive...

At close distance, you can get destructive interference at high frequencies because the delta path length between your ear and various places along the array increases the closer you get. The same...
Forum: DIY Speakers and Subs   02-27-2016, 04:30 PM
Replies: 336
Views: 7,668
Posted By JackNC
Nevertheless, quoting from p15 in "On the Design...

Nevertheless, quoting from p15 in "On the Design of Loudspeakers for Broadcast Monitoring",

" The approach adopted by H.D. Harwood and now an established BBC tradition is to contruct cabinets of...
Forum: DIY Speakers and Subs   02-27-2016, 01:58 PM
Replies: 336
Views: 7,668
Posted By JackNC
It actually depends on what the meaning of better...

It actually depends on what the meaning of better is. If you are in the manufacturing business, its what is the lowest cost for an adequate solution. If you are a hobbyist, it might mean what is...
Forum: DIY Speakers and Subs   02-27-2016, 06:46 AM
Replies: 336
Views: 7,668
Posted By JackNC
This has been a very interesting discussion but I...

This has been a very interesting discussion but I question that bracing is the sole focus of it. We should be looking at a total systems solution to the problem of reducing panel vibration to the...
Forum: DIY Speakers and Subs   02-24-2016, 09:36 PM
Replies: 15
Views: 429
Posted By JackNC
Thanks. That really helps. Surprised you...

Thanks. That really helps.
Surprised you used a saw to trim the excess as the factory outlet videos make it look easy to just score it with a razor blade knife.
Forum: DIY Speakers and Subs   02-24-2016, 02:56 PM
Replies: 15
Views: 429
Posted By JackNC
Smile thanks. I made the mistake of trying to stain...

thanks. I made the mistake of trying to stain some and it made me gun shy. Next time, I'll try it your way. A photo the finished product would be nice but I can understand not wanting to appear to...
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