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Forum: DIY Speakers and Subs   11-14-2014, 01:11 AM
Replies: 301
Views: 12,011
Posted By diy speaker guy
This link got me up and running very fast. ...

This link got me up and running very fast. Within two hours I could draw out a schematic and write a script for fairly complex enclosures. This thread deserves some kind of award, I haven't found...
Forum: DIY Speakers and Subs   11-14-2014, 12:26 AM
Replies: 301
Views: 12,011
Posted By diy speaker guy
The first set of graphs is (I believe) pretty...

The first set of graphs is (I believe) pretty accurate as drawn and posted by the OP. The sim was changed in the last graph to compare the first sim to a regular ported box sim to see what the...
Forum: DIY Speakers and Subs   11-13-2014, 11:23 PM
Replies: 301
Views: 12,011
Posted By diy speaker guy
In this situation the easiest way to visualize...

In this situation the easiest way to visualize the issue is to view the waves coming from the source, traveling through the side chambers, hitting the wall at the end, bouncing back and rejoining the...
Forum: DIY Speakers and Subs   11-13-2014, 07:01 AM
Replies: 301
Views: 12,011
Posted By diy speaker guy
I have 5 minutes til I have to go to work so for...

I have 5 minutes til I have to go to work so for a bit more clarification here's Danley's notes on this issue from the Labhorn design notes.



Just like in a room, inside a chamber (or a duct or...
Forum: DIY Speakers and Subs   11-13-2014, 06:34 AM
Replies: 301
Views: 12,011
Posted By diy speaker guy
Akabak will allow you to check velocity,...

Akabak will allow you to check velocity, pressure, and whatever else you want at any point in the enclosure. All you should really need is velocity to see if the holes are too small.

This is a...
Forum: DIY Speakers and Subs   08-05-2014, 04:37 PM
Replies: 413
Views: 9,195
Posted By diy speaker guy
Perhaps no clarification is necessary but I'll...

Perhaps no clarification is necessary but I'll offer some anyway for those that forgot my original post or didn't read it the first time around. Because of the way that quotes work it looks like I...
Forum: DIY Speakers and Subs   08-04-2014, 05:34 PM
Replies: 413
Views: 9,195
Posted By diy speaker guy
I have no idea. Someone pointed out that if you...

I have no idea. Someone pointed out that if you check his profile in some of the forums he used to post in it looks like he has visited since he stopped posting but he doesn't post anything anymore....
Forum: DIY Speakers and Subs   08-01-2014, 11:27 PM
Replies: 413
Views: 9,195
Posted By diy speaker guy
It clearly doesn't explain everything but it does...

It clearly doesn't explain everything but it does look closer to the measurement. A bit less damped and the low corner is maybe very slightly lower.

I fully admit I don't have the answers and I...
Forum: DIY Speakers and Subs   08-01-2014, 10:48 PM
Replies: 413
Views: 9,195
Posted By diy speaker guy
Fluid dynamics is one way to look at the issue...

Fluid dynamics is one way to look at the issue but I'm not sure how you could use it to do a fold. I'm also not sure the 180 degree bend part is right, a 180 is just two 90 degree bends. But then...
Forum: DIY Speakers and Subs   08-01-2014, 10:39 PM
Replies: 413
Views: 9,195
Posted By diy speaker guy
I peeked in on the thread periodically but wasn't...

I peeked in on the thread periodically but wasn't following closely. I did notice that Max pointed out that the sim was a lot closer to the measurement when the segments were switched to PAR. And...
Forum: DIY Speakers and Subs   08-01-2014, 07:33 PM
Replies: 413
Views: 9,195
Posted By diy speaker guy
Here's what Lilmike said about that. ...

Here's what Lilmike said about that.

"Original F-20 was powered by a BASH 300, with a modded highpass (flat to 20). I have measured it to confirm this."

If the original measured flat to 20 hz...
Forum: DIY Speakers and Subs   08-01-2014, 07:19 PM
Replies: 413
Views: 9,195
Posted By diy speaker guy
This info is in the Hornresp help file and a few...

This info is in the Hornresp help file and a few different Hornresp tutorials.

Sealed boxes need driver parameters, vrc and lrc filled in.

There are at least three different ways to sim ported...
Forum: DIY Speakers and Subs   08-01-2014, 06:39 PM
Replies: 413
Views: 9,195
Posted By diy speaker guy
Hornresp can do sealed and ported too, and...

Hornresp can do sealed and ported too, and ideally these comparisons should all be done in the same program. This will be a good exercise for you. Simulation is a great way to learn what this is...
Forum: DIY Speakers and Subs   08-01-2014, 05:40 PM
Replies: 413
Views: 9,195
Posted By diy speaker guy
You don't need to change anything, you either...

You don't need to change anything, you either like how it measures or you don't.

If you wanted to do some extra homework for bonus points you could do a bit of research and find out if the t/s...
Forum: DIY Speakers and Subs   08-01-2014, 05:31 PM
Replies: 413
Views: 9,195
Posted By diy speaker guy
Yeah, the whole measurement is shifted a bit to...

Yeah, the whole measurement is shifted a bit to the left compared to the sim. But the low corner is only a couple hz off.



It could also be consistent with wrong t/s parameters or a bunch of...
Forum: DIY Speakers and Subs   08-01-2014, 02:40 PM
Replies: 413
Views: 9,195
Posted By diy speaker guy
I don't know what was checked and what wasn't. ...

I don't know what was checked and what wasn't. But I don't think anyone measured the t/s parameters and I don't think anyone confirmed the accuracy of the fold. I also don't think anyone checked...
Forum: DIY Speakers and Subs   08-01-2014, 12:50 PM
Replies: 413
Views: 9,195
Posted By diy speaker guy
I seriously doubt this. Folding and the effects...

I seriously doubt this. Folding and the effects of folding are pretty well understood and I've never heard of anything like this happening due to 180 degree bends. 180 degree bends are just two 90...
Forum: DIY Speakers and Subs   08-01-2014, 10:25 AM
Replies: 413
Views: 9,195
Posted By diy speaker guy
Where are you going to ever move a box that's...

Where are you going to ever move a box that's 8x4x3 feet? It won't fit through any normal doorway and it certainly won't go around any bends in any hallways. It's going to weigh around 600 pounds...
Forum: DIY Speakers and Subs   08-01-2014, 09:58 AM
Replies: 413
Views: 9,195
Posted By diy speaker guy
It's actually pretty easy to fold up a hyp/ex...

It's actually pretty easy to fold up a hyp/ex horn. A snailshell fold like the Labhorn keeps it pretty square and the chamber in the middle can be any shape it needs to be to make sure it's square. ...
Forum: DIY Speakers and Subs   07-31-2014, 11:44 PM
Replies: 413
Views: 9,195
Posted By diy speaker guy
You can fit maybe 60 cubic feet of horn into that...

You can fit maybe 60 cubic feet of horn into that space. That isn't much. x3 is 180 cubic feet total.

With that limit you might as well pick one of Lilmike's horns, he knows what he's doing. ...
Forum: DIY Speakers and Subs   07-31-2014, 11:07 PM
Replies: 413
Views: 9,195
Posted By diy speaker guy
That's 3000 cubic feet total, not a few 3000...

That's 3000 cubic feet total, not a few 3000 cubic foot boxes.

Anyway, this is totally doable if you make a big riser, angle your walls in and use some garage space.

But since this is what I...
Forum: DIY Speakers and Subs   07-31-2014, 11:03 PM
Replies: 413
Views: 9,195
Posted By diy speaker guy
Four ZV4 with 1750 watts each, 3mm past xmax. ...

Four ZV4 with 1750 watts each, 3mm past xmax. Not sure how much these cost but probably not worth the extra compared to ZV3.

http://i60.tinypic.com/14dpvo4.png
Forum: DIY Speakers and Subs   07-31-2014, 10:52 PM
Replies: 413
Views: 9,195
Posted By diy speaker guy
He's got a garage underneath to work with. He's...

He's got a garage underneath to work with. He's talking a big game, just trying to find out how serious he is.



LOL, you need more? This isn't enough yet?

I'll check on the ZV4.
Forum: DIY Speakers and Subs   07-31-2014, 10:46 PM
Replies: 413
Views: 9,195
Posted By diy speaker guy
In tapped horns the backside of the driver does...

In tapped horns the backside of the driver does absolutely nothing except fill in a naturally occurring hole in the response. Tapped horns are just transmission lines with clever driver location to...
Forum: DIY Speakers and Subs   07-31-2014, 10:36 PM
Replies: 413
Views: 9,195
Posted By diy speaker guy
Time to man up. Four Sundown Audio ZV3 in 750...

Time to man up. Four Sundown Audio ZV3 in 750 cubic feet each. That's 3000 cubic feet total. 13 hz f3 and it doesn't even need a high pass filter.

http://i57.tinypic.com/2rqmzhg.png

1500...
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