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Forum: DIY Speakers and Subs   01-27-2015, 01:17 PM
Replies: 682
Views: 26,876
Posted By diy speaker guy
Talking about the effects of high inductance in a...

Talking about the effects of high inductance in a build and measurement thread using a high inductance driver is a thread derail? I would argue it's extremely relevant, certainly more relevant than...
Forum: DIY Speakers and Subs   01-27-2015, 12:43 PM
Replies: 61
Views: 1,808
Posted By diy speaker guy
The reason the sims don't match measurements in...

The reason the sims don't match measurements in ALL drivers I've sim'ed and compared to measurements I could find where the Le:Re ratio is 1:1 or higher is simply inductance. Just a couple of days...
Forum: DIY Speakers and Subs   01-27-2015, 01:03 AM
Replies: 682
Views: 26,876
Posted By diy speaker guy
Too bad I can't overlay graphs, it would be much...

Too bad I can't overlay graphs, it would be much easier to compare and see that the grey line in the sims don't match the measurements very well at all, and that my simple Le correction method does a...
Forum: DIY Speakers and Subs   01-27-2015, 12:49 AM
Replies: 682
Views: 26,876
Posted By diy speaker guy
The Le number we are given in a driver spec sheet...

The Le number we are given in a driver spec sheet is not even close to sufficient to provide an accurate sim of a very high inductance driver. Artificially adding more Le to the sim doesn't help...
Forum: DIY Speakers and Subs   01-27-2015, 12:44 AM
Replies: 682
Views: 26,876
Posted By diy speaker guy
Although it does look a bit like what you would...

Although it does look a bit like what you would normally see if you close mic'ed the port output alone that's not what's going on here. In this case it's a high inductance driver so there's going to...
Forum: DIY Speakers and Subs   01-22-2015, 09:17 AM
Replies: 682
Views: 26,876
Posted By diy speaker guy
+1, but also without the mains playing. Even 1/4...

+1, but also without the mains playing. Even 1/4 watt test is fine if disturbing the wife is an issue.
Forum: DIY Speakers and Subs   01-22-2015, 07:31 AM
Replies: 682
Views: 26,876
Posted By diy speaker guy
High inductance drivers will have an inductance...

High inductance drivers will have an inductance hump near the impedance peak(s) and a falling response at higher frequencies that a sim won't show when used in sealed or ported boxes. Take a look at...
Forum: DIY Speakers and Subs   01-22-2015, 07:23 AM
Replies: 682
Views: 26,876
Posted By diy speaker guy
The other thing left out of the post is exactly...

The other thing left out of the post is exactly how much power was applied. Just because it's a 4000 watt amp doesn't mean it producing 4000 watts at the time.

Even if it was producing 4000...
Forum: DIY Speakers and Subs   01-22-2015, 07:11 AM
Replies: 682
Views: 26,876
Posted By diy speaker guy
It's high enough that sims won't match...

It's high enough that sims won't match measurements. This isn't uncommon for high excursion drivers, the UXL sims don't match measurements either. Take a look around data-bass.com and do some sims...
Forum: DIY Speakers and Subs   01-21-2015, 09:28 PM
Replies: 682
Views: 26,876
Posted By diy speaker guy
The measurement almost certainly won't look like...

The measurement almost certainly won't look like the OP's original sim or anyone else's, including mine. This is a high inductance driver measured in room. You can't accurately simulate high...
Forum: DIY Speakers and Subs   11-29-2014, 12:16 PM
Replies: 682
Views: 26,876
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: 682
Views: 26,876
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: 682
Views: 26,876
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: 682
Views: 26,876
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: 682
Views: 26,876
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: 682
Views: 26,876
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: 682
Views: 26,876
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: 682
Views: 26,876
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: 682
Views: 26,876
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: 682
Views: 26,876
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: 682
Views: 26,876
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: 682
Views: 26,876
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: 682
Views: 26,876
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: 682
Views: 26,876
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: 470
Views: 11,734
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...
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