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Forum: DIY Speakers and Subs   07-29-2014, 11:39 PM
Replies: 547
Views: 14,387
Posted By LTD02
if you put one sub in blue, that mode gets...

if you put one sub in blue, that mode gets excited.
if you put one sub in red, that mode gets excited.
if you put one sub in red AND one sub in blue, that mode gets cancelled.
if you put the...
Forum: DIY Speakers and Subs   07-29-2014, 10:33 PM
Replies: 167
Views: 2,168
Posted By LTD02
the lab 12 driver is great. lab 15 is great too....

the lab 12 driver is great. lab 15 is great too. lots of drivers work in horns. for bass horns, it comes down to how much volume displacement the driver has for max spl in combination with horn...
Forum: DIY Speakers and Subs   07-29-2014, 09:08 PM
Replies: 29
Views: 660
Posted By LTD02
until recently, mostly in the 40-50hz ballpark. ...

until recently, mostly in the 40-50hz ballpark. now it is more common for hits down around 30hz and in some cases, down past 20hz. if that is what you like then really nailing it from 25-50hz is...
Forum: DIY Speakers and Subs   07-29-2014, 08:28 PM
Replies: 8
Views: 254
Posted By LTD02
shouldn't be a material difference with or...

shouldn't be a material difference with or without the material. :-)
Forum: DIY Speakers and Subs   07-29-2014, 10:46 AM
Replies: 29
Views: 660
Posted By LTD02
http://www.avsforum.com/forum/155-diy-speakers-sub...

http://www.avsforum.com/forum/155-diy-speakers-subs/1489541-large-ported-dayton-ho18-s.html#post23711347


many different form factors to choose from. hundreds of builds. just figure out what...
Forum: DIY Speakers and Subs   07-29-2014, 10:34 AM
Replies: 8
Views: 254
Posted By LTD02
congrats on your sub. bracing is fine. ...

congrats on your sub.


bracing is fine.


stuffing may or may not provide a benefit: http://www.data-bass.com/data?page=content&id=79
Forum: DIY Speakers and Subs   07-29-2014, 03:16 AM
Replies: 167
Views: 2,168
Posted By LTD02
it is a completely different animal. ...

it is a completely different animal.


http://www.prosoundweb.com/article/lsp_documentation_page_drawings_photos_specs_and_more/


frequency response is something kind of like this:

...
Forum: DIY Speakers and Subs   07-28-2014, 11:11 PM
Replies: 167
Views: 2,168
Posted By LTD02
"Is that displayed anywhere or I just need to do...

"Is that displayed anywhere or I just need to do math to figure it out ?"


if you mouse over s2 and the value is within some range, it will display the compression ratio in the bar at the bottom...
Forum: DIY Speakers and Subs   07-28-2014, 10:52 PM
Replies: 167
Views: 2,168
Posted By LTD02
expanding on what appears to be a good idea... ...

expanding on what appears to be a good idea...

path length extends to about ~26 feet, ~775cm
not an exact scale drawing.

...
Forum: DIY Speakers and Subs   07-28-2014, 10:28 PM
Replies: 167
Views: 2,168
Posted By LTD02
this one has about 22 foot path length and about...

this one has about 22 foot path length and about a 19hz tune. lol.


http://www.avsforum.com/forum/attachment.php?attachmentid=185378&stc=1&d=1406611958

max spl 2 pi space.

...
Forum: DIY Speakers and Subs   07-28-2014, 09:55 PM
Replies: 167
Views: 2,168
Posted By LTD02
http://www.avsforum.com/forum/attachment.php?attac...

http://www.avsforum.com/forum/attachment.php?attachmentid=185322&stc=1&d=1406609740


this kind of design would provide fairly similar loading per driver. I'm not sure, but the model shows...
Forum: DIY Speakers and Subs   07-28-2014, 06:36 PM
Replies: 167
Views: 2,168
Posted By LTD02
the numbers on the right describe the expansion...

the numbers on the right describe the expansion rate of each section and can be ignored.


compression ratio is sd or 2x sd (if using 2 drivers) divided by s2.


switch to 2.0 pi space for...
Forum: DIY Speakers and Subs   07-28-2014, 05:35 PM
Replies: 167
Views: 2,168
Posted By LTD02
see also:...

see also: http://www.avsforum.com/forum/155-diy-speakers-subs/1458644-gjallarhorn-vs-little-wrecker.html#post22976291
Forum: DIY Speakers and Subs   07-28-2014, 05:27 PM
Replies: 167
Views: 2,168
Posted By LTD02
"I'm not finding a "driver displacement" tab. ...

"I'm not finding a "driver displacement" tab. Give me a hint!"


sorry, "diaphragm displacement".
Forum: DIY Speakers and Subs   07-28-2014, 05:26 PM
Replies: 167
Views: 2,168
Posted By LTD02
"LTD02 would you mind posting up the HORNRESP...

"LTD02 would you mind posting up the HORNRESP screen shots of the design you were initially playing with with a great looking response at the beginning of this thread ? Or whatever you currently...
Forum: DIY Speakers and Subs   07-28-2014, 05:05 PM
Replies: 167
Views: 2,168
Posted By LTD02
"What is the tune on the lilwrecker? It's the...

"What is the tune on the lilwrecker? It's the lowest tune of his designs ?"


somewhere around 15hz (measured).


"Why not a GHORN ? "


because you have more space and wood than money....
Forum: DIY Speakers and Subs   07-28-2014, 04:27 PM
Replies: 167
Views: 2,168
Posted By LTD02
"So first question is do I do anything special in...

"So first question is do I do anything special in HORNRESP to use dual drivers to design?"


next to offset driver, click on it and change to "2P" for two drivers.


"So “tuning point” is...
Forum: DIY Speakers and Subs   07-28-2014, 03:01 PM
Replies: 167
Views: 2,168
Posted By LTD02
"I am probably going with a larger woofer style...

"I am probably going with a larger woofer style SEOS design, and possibly a dual woofer design so midbass should be plenty without the need for the horns to go too high. I'd rather have a lower...
Forum: DIY Speakers and Subs   07-28-2014, 02:43 PM
Replies: 167
Views: 2,168
Posted By LTD02
it was asked, "how to get started" with a design....

it was asked, "how to get started" with a design.


this is roughly the process that i was working with:
for flh, the process is fairly straightforward to get started.
1. set the throat s2 to...
Forum: DIY Speakers and Subs   07-27-2014, 10:57 PM
Replies: 167
Views: 2,168
Posted By LTD02
another option could be to build such a horn with...

another option could be to build such a horn with bricks or concrete block.


many are familiar with this build, but many are not.


royal device, second sub featured:

...
Forum: DIY Speakers and Subs   07-27-2014, 09:06 PM
Replies: 167
Views: 2,168
Posted By LTD02
by the way, props on your initiative to tackle...

by the way, props on your initiative to tackle hornresp. :-)
Forum: DIY Speakers and Subs   07-27-2014, 09:04 PM
Replies: 167
Views: 2,168
Posted By LTD02
"Unfortunately, the spec sheest does not specify...

"Unfortunately, the spec sheest does not specify whether the params were measured with voice coils in series or parallel. Hard to say. Someone who has measured the driver can chime in."


I'm...
Forum: DIY Speakers and Subs   07-27-2014, 08:55 PM
Replies: 167
Views: 2,168
Posted By LTD02
So what about this Lcr ? Lcr = Rear Chamber...

So what about this Lcr ? Lcr = Rear Chamber average length (cm).


Lcr is the distance from the driver to the wall of the chamber behind it. just make it about 30cm, i.e. about 1 foot. it only...
Forum: DIY Speakers and Subs   07-27-2014, 08:52 PM
Replies: 167
Views: 2,168
Posted By LTD02
28.3 liters per cubic foot, roughly remember...

28.3 liters per cubic foot, roughly
remember that the wood itself takes up considerable volume with something like this, so subtract off about 15-20% for that and a little more if the horn has air...
Forum: DIY Speakers and Subs   07-27-2014, 08:49 PM
Replies: 167
Views: 2,168
Posted By LTD02
these numbers aren't doubled check or anything,...

these numbers aren't doubled check or anything, just a napkin sketch.
the parameters for the d2 and d4 may be a little different, I'm not sure.
I just happened to have the d4 entered for coils in...
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