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Forum: DIY Speakers and Subs   01-30-2015, 11:12 AM
Replies: 142
Views: 4,075
Posted By diy speaker guy
First, let me say that I don't disagree with...

First, let me say that I don't disagree with anything you are saying.

Second, let me say that this discussion has been ongoing for almost 2 years in 4 different threads so some context is...
Forum: DIY Speakers and Subs   01-29-2015, 11:57 PM
Replies: 142
Views: 4,075
Posted By diy speaker guy
Yes, klippel is making his own standard. His...

Yes, klippel is making his own standard. His standard is meant to more accurately correlate excursion and distortion than the old method, and it is more effective than the old method.

Yes, I mean...
Forum: DIY Speakers and Subs   01-29-2015, 11:31 PM
Replies: 142
Views: 4,075
Posted By diy speaker guy
I don't know how or why he chose 82% Bl as the...

I don't know how or why he chose 82% Bl as the standard, but that's what he chose to correlate to 10% thd. (All of the klippel xmax limiting categories are supposed to correlate to 10% thd.) ...
Forum: DIY Speakers and Subs   01-29-2015, 10:57 PM
Replies: 142
Views: 4,075
Posted By diy speaker guy
If it proves to be a useful spec that accurately...

If it proves to be a useful spec that accurately describes the subjective impression of quality consistently I'm all for it, providing you can convince the entire industry to adopt it. Otherwise it...
Forum: DIY Speakers and Subs   01-29-2015, 10:55 PM
Replies: 142
Views: 4,075
Posted By diy speaker guy
71% Bl is 20% distortion. 82% Bl is 10%...

71% Bl is 20% distortion. 82% Bl is 10% distortion. As far as IM distortion, I'm just quoting the klippel spec sheet pdf.

These are not specs that no one uses. They are used all the time for pro...
Forum: DIY Speakers and Subs   01-29-2015, 09:59 PM
Replies: 142
Views: 4,075
Posted By diy speaker guy
Agreed, but compared to the original statement by...

Agreed, but compared to the original statement by Electrodynamic that it was a continuous sine wave for the duration of the test, the 1:3 duty cycle of on/off that was actually applied is a LOT less...
Forum: DIY Speakers and Subs   01-29-2015, 09:21 PM
Replies: 142
Views: 4,075
Posted By diy speaker guy
Just for fun here's the klippel defined Xc spec. ...

Just for fun here's the klippel defined Xc spec.

http://i62.tinypic.com/206lkaw.png

"A symmetrical compliance characteristic will produce about 10% total harmonic distortion at a threshold Cmin...
Forum: DIY Speakers and Subs   01-29-2015, 09:13 PM
Replies: 142
Views: 4,075
Posted By diy speaker guy
It's all right there in the paper I linked to. ...

It's all right there in the paper I linked to.

http://i62.tinypic.com/30a8bbt.png

The first box is near the top of the pdf, notice the last sentence - "The threshold Bl(min)=82% will produce...
Forum: DIY Speakers and Subs   01-29-2015, 08:32 PM
Replies: 142
Views: 4,075
Posted By diy speaker guy
Other than the fact that it's become acceptable...

Other than the fact that it's become acceptable to use 71% Bl (corresponding to 20% distortion) for subwoofer drivers rather than klippel's defined limit of 82% (corresponding to 10% distortion)...
Forum: DIY Speakers and Subs   01-29-2015, 07:19 PM
Replies: 142
Views: 4,075
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: 142
Views: 4,075
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: 142
Views: 4,075
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: 142
Views: 4,075
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: 142
Views: 4,075
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: 142
Views: 4,075
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: 142
Views: 4,075
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: 142
Views: 4,075
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: 27,600
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: 142
Views: 4,075
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: 27,600
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: 27,600
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: 27,600
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: 27,600
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: 27,600
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: 27,600
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...
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