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Forum: DIY Speakers and Subs   03-25-2015, 12:17 AM
Replies: 154
  HzHorn
Views: 4,403
Posted By diy speaker guy
Use PL Premium for the last panel. And hope and...

Use PL Premium for the last panel. And hope and pray there's no air leaks in any of your other glue joints. If there is you'll never be able to reach them again to fix them. I use PL exclusively...
Forum: DIY Speakers and Subs   03-12-2015, 09:09 AM
Replies: 16
Views: 313
Posted By diy speaker guy
WinISD is the wrong tool to use if the resonances...

WinISD is the wrong tool to use if the resonances are anywhere near the passband. The "use transmission line model for port simulation" is laughably inaccurate. There are plenty of very good free...
Forum: DIY Speakers and Subs   03-11-2015, 08:31 PM
Replies: 16
Views: 313
Posted By diy speaker guy
What happens when port volume > cabinet volume? ...

What happens when port volume > cabinet volume? It's called a transmission line. If the transition from cab to port is abrupt it's called a stepped transmission line.



That "giant mess"...
Forum: DIY Speakers and Subs   03-05-2015, 06:21 PM
Replies: 154
  HzHorn
Views: 4,403
Posted By diy speaker guy
Gjallerhorn? There's a refold I think, has it...

Gjallerhorn? There's a refold I think, has it been measured yet?


To be clear, inductance is specified properly in the specs, but with an inductance ratio (Le:Re) of over 1 the inductance effect...
Forum: DIY Speakers and Subs   02-25-2015, 07:45 PM
Replies: 154
  HzHorn
Views: 4,403
Posted By diy speaker guy
Hornresp isn't quite as flexible as it could be...

Hornresp isn't quite as flexible as it could be with regard to throat chamber and where it enters into the horn. For all tapped horns the driver (and throat chamber if applicable) enter the horn at...
Forum: DIY Speakers and Subs   02-05-2015, 08:04 PM
Replies: 1,063
Views: 43,279
Posted By diy speaker guy
I'd love to provide my own measurements but...

I'd love to provide my own measurements but unfortunately Nick doesn't come to my house with drivers to test.

I'm not speaking negatively about anyone, just pointing out that no useful...
Forum: DIY Speakers and Subs   02-05-2015, 02:23 PM
Replies: 33
Views: 602
Posted By diy speaker guy
One inch from the dustcap should be plenty close...

One inch from the dustcap should be plenty close enough.

Your box has two drivers and it's 190 liters net internal volume, yes? I simulated it as one driver in a 95 liter box. Frequency response...
Forum: DIY Speakers and Subs   02-05-2015, 01:48 PM
Replies: 33
Views: 602
Posted By diy speaker guy
I can simulate it and estimate the effect of...

I can simulate it and estimate the effect of inductance if you like, but I can't comment on the room effects or measurement techniques. Not sure if the mic was close enough to eliminate the room...
Forum: DIY Speakers and Subs   02-05-2015, 01:33 PM
Replies: 1,063
Views: 43,279
Posted By diy speaker guy
Understood, and I'm sure the things (like...

Understood, and I'm sure the things (like frequency response) that were measured were measured very accurately.

But if no one knows why the amp failed, no one measured the voltage the amp was...
Forum: DIY Speakers and Subs   02-05-2015, 09:43 AM
Replies: 1,063
Views: 43,279
Posted By diy speaker guy
I realize the point of the GTG was not to be...

I realize the point of the GTG was not to be scientific and that's fine but at this point there's dozens (hundreds?) of posts on this forum about the 8000 watt amp and how it failed to kill the...
Forum: DIY Speakers and Subs   02-05-2015, 08:56 AM
Replies: 1,063
Views: 43,279
Posted By diy speaker guy
Agreed about the thread appropriate factor, but...

Agreed about the thread appropriate factor, but remember I didn't bring this up in EITHER of the recent threads.

Subjective impressions are nice and all but they aren't that useful as data, and in...
Forum: DIY Speakers and Subs   02-05-2015, 08:33 AM
Replies: 1,063
Views: 43,279
Posted By diy speaker guy
Yes, not sure how I forgot about that, sorry. It...

Yes, not sure how I forgot about that, sorry. It was late when I posted that.



Agreed, but most people won't pick up on the differences due to the fact that some drivers are tested in 4.2...
Forum: DIY Speakers and Subs   02-04-2015, 10:19 PM
Replies: 1,063
Views: 43,279
Posted By diy speaker guy
Clearly it's a mixed bag. I've received equal...

Clearly it's a mixed bag. I've received equal amounts of support and hate mail.

More - Thanks.

Fat - I didn't bring this up, IIRC Mark Seaton brought it up in post 611. Since then dgage,...
Forum: DIY Speakers and Subs   02-04-2015, 09:21 PM
Replies: 1,063
Views: 43,279
Posted By diy speaker guy
Sure, I saw the same thing, and that is good...

Sure, I saw the same thing, and that is good news. I'm just suggesting that the "try really really hard to blow up the driver with an unmeasured power level and random program material" test is...
Forum: DIY Speakers and Subs   02-04-2015, 04:36 PM
Replies: 1,063
Views: 43,279
Posted By diy speaker guy
I'm not assuming anything, just pointing out...

I'm not assuming anything, just pointing out there are other factors (including factors outside your house) that can cause an amp to go into protection. Regardless of what the electrical company man...
Forum: DIY Speakers and Subs   02-03-2015, 09:09 PM
Replies: 1,063
Views: 43,279
Posted By diy speaker guy
I will repeat again - the session was NOT...

I will repeat again - the session was NOT demanding, read my previous posts. The tracks chosen contained peak power frequencies that did not cause excessive power consumption due to the frequencies...
Forum: DIY Speakers and Subs   02-03-2015, 06:47 PM
Replies: 1,063
Views: 43,279
Posted By diy speaker guy
I don't think OP ever mentioned how far away the...

I don't think OP ever mentioned how far away the mic was in his measurement. If it wasn't closer then about 12 inches it wasn't close enough to eliminate room effects.



Bold added by me. ...
Forum: DIY Speakers and Subs   02-02-2015, 11:32 PM
Replies: 1,063
Views: 43,279
Posted By diy speaker guy
Before I start in on this, here's a quote from...

Before I start in on this, here's a quote from Mark Seaton from a different thread, bold added by me because these points are extremely important. From this thread -...
Forum: DIY Speakers and Subs   02-01-2015, 03:49 PM
Replies: 89
Views: 3,248
Posted By diy speaker guy
I'd have to do an Akabak sim to find the point of...

I'd have to do an Akabak sim to find the point of diminishing returns for the flare. It might be fine the way it is.

Is the box built already? I could try simulating the driver in a transmission...
Forum: DIY Speakers and Subs   02-01-2015, 02:38 PM
Replies: 89
Views: 3,248
Posted By diy speaker guy
Ok here's your sim and a quick analysis as...

Ok here's your sim and a quick analysis as promised. Unfortunately I don't have enough segments in Hornresp to simulate the enclosure exactly and I don't have time to do a full analysis in Akabak...
Forum: DIY Speakers and Subs   02-01-2015, 11:50 AM
Replies: 204
Views: 6,624
Posted By diy speaker guy
I didn't realize you and diymobileaudio weren't...

I didn't realize you and diymobileaudio weren't doing it anymore. That's too bad.

$50K is quite a significant investment. I didn't know it was that expensive.
Forum: DIY Speakers and Subs   02-01-2015, 06:07 AM
Replies: 204
Views: 6,624
Posted By diy speaker guy
FWIW the UXL is high inductance but it doesn't...

FWIW the UXL is high inductance but it doesn't have nearly as much of an inductance hump as the RE XXX for example. Check the measurements on data bass.

Like I mentioned in my last post it's...
Forum: DIY Speakers and Subs   01-31-2015, 11:04 PM
Replies: 204
Views: 6,624
Posted By diy speaker guy
There's a sizable difference in inductance, which...

There's a sizable difference in inductance, which skews frequency response of the high inductance driver (compared to a simulation which won't show the effect of the inductance hump).
Forum: DIY Speakers and Subs   01-31-2015, 10:48 PM
Replies: 204
Views: 6,624
Posted By diy speaker guy
What you can do is a bit of studying and a bit of...

What you can do is a bit of studying and a bit of simulation. It's extraordinarily difficult to come up with absolutely concrete answers when comparing different drivers from different companies. ...
Forum: DIY Speakers and Subs   01-31-2015, 11:19 AM
Replies: 204
Views: 6,624
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...
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