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Forum: DIY Speakers and Subs   01-29-2015, 07:19 PM
Replies: 114
Views: 3,341
Posted By diy speaker guy
Yes, the prototype motor bolted to a 15 inch...

Yes, the prototype motor bolted to a 15 inch frame with 15 inch soft parts. The production version coil (and possibly the motor too) is different than the prototype. It's all detailed in the...
Forum: DIY Speakers and Subs   01-29-2015, 07:08 PM
Replies: 114
Views: 3,341
Posted By diy speaker guy
It came from the same thread, from...

It came from the same thread, from Electrodynamic's reply to the post you made that you copied here.

He said "How many other single driver setups are capable of handling the equivalent of a...
Forum: DIY Speakers and Subs   01-29-2015, 09:56 AM
Replies: 114
Views: 3,341
Posted By diy speaker guy
I have no idea how Mark wired the driver. All...

I have no idea how Mark wired the driver. All the info I know I already posted. Ask Mark.

You said the dust cap was warm after your torture test. Neither the cone or dustcap of this driver are...
Forum: DIY Speakers and Subs   01-28-2015, 12:36 AM
Replies: 114
Views: 3,341
Posted By diy speaker guy
Bl is not the only factor that limits xmax. ...

Bl is not the only factor that limits xmax. Displacement limit due to compliance variation, displacement limit due to inductance, displacement limit due to IM distortion are all factors that limit...
Forum: DIY Speakers and Subs   01-27-2015, 11:51 PM
Replies: 114
Views: 3,341
Posted By diy speaker guy
No need to get defensive about AE's anticipated...

No need to get defensive about AE's anticipated specs. Your own driver has been out for a couple of years now and still no klippel tests to verify the published xmax spec of the production version. ...
Forum: DIY Speakers and Subs   01-27-2015, 08:24 PM
Replies: 114
Views: 3,341
Posted By diy speaker guy
Sure, you can push it that far. But I'd bet it...

Sure, you can push it that far. But I'd bet it sounds pretty nasty already at 35 mm if the surround is dimpling.
Forum: DIY Speakers and Subs   01-27-2015, 08:21 PM
Replies: 114
Views: 3,341
Posted By diy speaker guy
The only details I know are that it was a 4000...

The only details I know are that it was a 4000 watt amp and the driver lasted 30 seconds. I have no idea why he would do that but I doubt it was marketing, that's a really bad way to sell drivers...
Forum: DIY Speakers and Subs   01-27-2015, 06:26 PM
Replies: 114
Views: 3,341
Posted By diy speaker guy
That's not how I read it. From data-bass.com - ...

That's not how I read it. From data-bass.com -



That's about 76 mm p-p or 38 mm one way.

If the surround is visibly dimpling the driver is already into heavy distortion. I've never seen a...
Forum: DIY Speakers and Subs   01-27-2015, 01:17 PM
Replies: 687
Views: 27,553
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: 114
Views: 3,341
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: 687
Views: 27,553
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: 687
Views: 27,553
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: 687
Views: 27,553
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: 687
Views: 27,553
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: 687
Views: 27,553
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: 687
Views: 27,553
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: 687
Views: 27,553
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: 687
Views: 27,553
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: 687
Views: 27,553
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: 687
Views: 27,553
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: 687
Views: 27,553
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: 687
Views: 27,553
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: 687
Views: 27,553
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: 687
Views: 27,553
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: 687
Views: 27,553
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...
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