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Forum: DIY Speakers and Subs   11-29-2014, 12:16 PM
Replies: 449
Views: 17,763
Posted By diy speaker guy
In that case you might get pretty different...

In that case you might get pretty different response across the length of the couch, the distance is too small for the room to mix it up much, but at the same time it's not the only sub so it might...
Forum: DIY Speakers and Subs   11-29-2014, 12:11 PM
Replies: 449
Views: 17,763
Posted By diy speaker guy
Not OT at all, and the devil is in the details. ...

Not OT at all, and the devil is in the details. Enclosure design is as complicated as you want to make it, and as capable as Akabak is there are still dozens of factors that not even that software...
Forum: DIY Speakers and Subs   11-29-2014, 12:00 PM
Replies: 449
Views: 17,763
Posted By diy speaker guy
I deleted my post that you are referring to...

I deleted my post that you are referring to because I realized we weren't talking about the same design.

Agreed, it would be minimal (especially in a WinISD sim with no resonances since the port...
Forum: DIY Speakers and Subs   11-29-2014, 11:30 AM
Replies: 449
Views: 17,763
Posted By diy speaker guy
Yes agreed. But I was trying to tie this into...

Yes agreed. But I was trying to tie this into mutual coupling too, in which case the port/driver distance alone does matter. Maybe I shouldn't have tried to do that as my example doesn't show...
Forum: DIY Speakers and Subs   11-29-2014, 10:21 AM
Replies: 449
Views: 17,763
Posted By diy speaker guy
If the driver and port were very close together...

If the driver and port were very close together you wouldn't see this effect at all at any distance from either source (so it is directly related to the distance between sources) and you would also...
Forum: DIY Speakers and Subs   11-29-2014, 09:43 AM
Replies: 449
Views: 17,763
Posted By diy speaker guy
Here, try this image. This is a very simplified...

Here, try this image. This is a very simplified model (not really accurate but close enough to show the effect).

First graph - port output alone.
Second graph - combined response of port and...
Forum: DIY Speakers and Subs   11-29-2014, 08:55 AM
Replies: 449
Views: 17,763
Posted By diy speaker guy
Try this image instead. The big graph is Ricci's...

Try this image instead. The big graph is Ricci's measurement, the dark line in the sim is what the box should have performed like according to a sim, since the sim can't take the inductance effect...
Forum: DIY Speakers and Subs   11-29-2014, 08:52 AM
Replies: 449
Views: 17,763
Posted By diy speaker guy
At 16 hz the port spacing is more than fine, the...

At 16 hz the port spacing is more than fine, the ports could be several feet away from the driver and still be fine. At the upper end of the bandwidth it's not so fine. With a 100 hz crossover and...
Forum: DIY Speakers and Subs   11-29-2014, 08:27 AM
Replies: 449
Views: 17,763
Posted By diy speaker guy
Correct, 1/4 wave distance or less will provide...

Correct, 1/4 wave distance or less will provide complete mutual coupling. But it's the high frequencies with shorter wavelengths you need to worry about, not 30 hz. Depending on the crossover slope...
Forum: DIY Speakers and Subs   11-14-2014, 01:11 AM
Replies: 449
Views: 17,763
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: 449
Views: 17,763
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: 449
Views: 17,763
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: 449
Views: 17,763
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: 449
Views: 17,763
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: 441
Views: 10,215
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: 441
Views: 10,215
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: 441
Views: 10,215
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: 441
Views: 10,215
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: 441
Views: 10,215
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: 441
Views: 10,215
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: 441
Views: 10,215
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: 441
Views: 10,215
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: 441
Views: 10,215
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: 441
Views: 10,215
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: 441
Views: 10,215
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...
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