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Forum: DIY Speakers and Subs   01-31-2015, 12:19 PM
Replies: 180
Views: 4,972
Posted By diy speaker guy
The larger coil. attention to inductance control...

The larger coil. attention to inductance control and aesthetic improvements sound very promising. You are way out of my price league but I think this driver will sell well. You might be...
Forum: DIY Speakers and Subs   01-31-2015, 11:47 AM
Replies: 180
Views: 4,972
Posted By diy speaker guy
Since the specs and the hype have been addressed...

Since the specs and the hype have been addressed at this point and since you've shown an interest in learning a bit I'll take a little time to show how box size, inductance, power handling and...
Forum: DIY Speakers and Subs   01-30-2015, 07:49 PM
Replies: 180
Views: 4,972
Posted By diy speaker guy
Absolutely. If AE claims their new driver is the...

Absolutely. If AE claims their new driver is the highest displacement driver on the planet and posts information that implies that it's not even close to living up to that claim then I will speak...
Forum: DIY Speakers and Subs   01-30-2015, 06:46 PM
Replies: 180
Views: 4,972
Posted By diy speaker guy
Are you asking me? This is way outside of my...

Are you asking me? This is way outside of my knowledge base.

There are people you can ask.

John Murphy wrote the DATS software I believe, he's active on parts express techtalk forum.
Bill...
Forum: DIY Speakers and Subs   01-30-2015, 06:15 PM
Replies: 180
Views: 4,972
Posted By diy speaker guy
I already addressed this when I said "I've never...

I already addressed this when I said "I've never seen a spec sheet that says how that figure was determined unless it's based on coil and gap measurements because that method is known to be very...
Forum: DIY Speakers and Subs   01-30-2015, 06:10 PM
Replies: 180
Views: 4,972
Posted By diy speaker guy
It's not hard at all. There are a few hobbyists...

It's not hard at all. There are a few hobbyists that own klippel machines and if they have an interest in the driver you want tested they will test it for free if you pay for the driver and shipping...
Forum: DIY Speakers and Subs   01-30-2015, 05:40 PM
Replies: 180
Views: 4,972
Posted By diy speaker guy
Spec sheets list xmax with no other details. ...

Spec sheets list xmax with no other details. I've never seen a spec sheet that says how that figure was determined unless it's based on coil and gap measurements because that method is known to be...
Forum: DIY Speakers and Subs   01-30-2015, 04:58 PM
Replies: 180
Views: 4,972
Posted By diy speaker guy
I agree that some data is better than no data but...

I agree that some data is better than no data but cherry picking which data to use to justify a manufacturer rated spec is a slippery slope. Everyone (especially small start up companies) wants to...
Forum: DIY Speakers and Subs   01-30-2015, 11:12 AM
Replies: 180
Views: 4,972
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: 180
Views: 4,972
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: 180
Views: 4,972
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: 180
Views: 4,972
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: 180
Views: 4,972
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: 180
Views: 4,972
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: 180
Views: 4,972
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: 180
Views: 4,972
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: 180
Views: 4,972
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: 180
Views: 4,972
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: 180
Views: 4,972
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: 180
Views: 4,972
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: 180
Views: 4,972
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: 180
Views: 4,972
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: 180
Views: 4,972
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: 180
Views: 4,972
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: 180
Views: 4,972
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...
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