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Search: Posts Made By: diy speaker guy
Forum: DIY Speakers and Subs   04-20-2015, 08:22 PM
Replies: 138
Views: 2,154
Posted By diy speaker guy
Keeping the panels exactly square and flat can be...

Keeping the panels exactly square and flat can be a problem. Soft plywoods (like sanded pine) can warp badly, especially thin stock like 3/8 or 1/2 inch. Even 5/8 is prone to a bit of warp. That...
Forum: DIY Speakers and Subs   04-20-2015, 08:18 PM
Replies: 33
Views: 353
Posted By diy speaker guy
That won't fix (seal) a bad glue joint. Pressure...

That won't fix (seal) a bad glue joint. Pressure losses in a horn are the kiss of death. If you don't have a perfect seal you might as well burn it.

If that's what it is you might get rid of...
Forum: DIY Speakers and Subs   04-20-2015, 08:12 PM
Replies: 30
Views: 204
Posted By diy speaker guy
If it's a high inductance driver (Le:Re ratio 1:1...

If it's a high inductance driver (Le:Re ratio 1:1 or higher) and it's measured in a sealed box and the level at 200 hz is not higher than at all the lower frequencies (in other words if you see a...
Forum: DIY Speakers and Subs   04-20-2015, 07:54 PM
Replies: 33
Views: 353
Posted By diy speaker guy
It could also be a loose shorting ring bouncing...

It could also be a loose shorting ring bouncing around inside the motor, a loose gasket flapping in the wind, a loose screw wiggling around, a loose brace bumping back and forth, a loose surround (or...
Forum: DIY Speakers and Subs   04-20-2015, 07:43 PM
Replies: 30
Views: 204
Posted By diy speaker guy
Yes, it's been a known issue for as long as high...

Yes, it's been a known issue for as long as high inductance drivers have been produced.

That's why I was so excited to have a consistent and (fairly) accurate tweak to quantify this behavior. I'm...
Forum: DIY Speakers and Subs   04-20-2015, 07:23 PM
Replies: 30
Views: 204
Posted By diy speaker guy
I applied the exact same tweak to a bunch of...

I applied the exact same tweak to a bunch of different drivers in a bunch of different measured enclosures. You can do the same thing.

Data-bass.com has probably a couple dozen different high...
Forum: DIY Speakers and Subs   04-20-2015, 06:55 PM
Replies: 30
Views: 204
Posted By diy speaker guy
Have you confirmed that your specific tweak (Le2...

Have you confirmed that your specific tweak (Le2 = 4, Re2 = 5) works with the same driver in a bunch of different enclosures? That's the level of due diligence that must be done to confirm you've...
Forum: DIY Speakers and Subs   04-20-2015, 06:51 PM
Replies: 30
Views: 204
Posted By diy speaker guy
That's the first paragraph of post 1 of this...

That's the first paragraph of post 1 of this thread (minus the very first sentence). There's even a link.

I've been alternately ignored, mocked and ridiculed for even bringing this issue up since...
Forum: DIY Speakers and Subs   04-20-2015, 06:46 PM
Replies: 30
Views: 204
Posted By diy speaker guy
For those that don't want to read all the...

For those that don't want to read all the suggested reading just read this post.
...
Forum: DIY Speakers and Subs   04-20-2015, 06:33 PM
Replies: 30
Views: 204
Posted By diy speaker guy
As you know I'm not particularly happy with...

As you know I'm not particularly happy with WinISD's limitations either. I reinstalled Windows last year and still haven't got around to putting WinISD back. It's not that useful IMO. Most of the...
Forum: DIY Speakers and Subs   04-20-2015, 06:28 PM
Replies: 30
Views: 204
Posted By diy speaker guy
And this flurry of speculation, opinion, and...

And this flurry of speculation, opinion, and going off half cocked is exactly why I was happy to hide in the Hzhorn thread with a small audience to discuss this.

I hand you guys an inductance...
Forum: DIY Speakers and Subs   04-20-2015, 06:25 PM
Replies: 30
Views: 204
Posted By diy speaker guy
If you can take the measured t/s parameters and...

If you can take the measured t/s parameters and use them to get anything vaguely resembling an accurate sim that matches a measurement of a high inductance driver then be my guest.

This is the...
Forum: DIY Speakers and Subs   04-20-2015, 06:22 PM
Replies: 30
Views: 204
Posted By diy speaker guy
The relevant posts are listed in post 1. There's...

The relevant posts are listed in post 1. There's a LOT of info.

I also posted this info in Popalock's big ported build thread, posted it in a thread on diyaudio last October, and posted random...
Forum: DIY Speakers and Subs   04-20-2015, 06:20 PM
Replies: 30
Views: 204
Posted By diy speaker guy
This has already been done, read the posts OP...

This has already been done, read the posts OP referred to.

I've applied my correction method to sims with a variety of different high inductance drivers in a variety of different enclosures...
Forum: DIY Speakers and Subs   04-20-2015, 05:44 PM
Replies: 30
Views: 204
Posted By diy speaker guy
As previously discussed that's only going to work...

As previously discussed that's only going to work with enclosure types that Unibox can model, which isn't many. The inductance correction method I came up with works with any simulator, any driver,...
Forum: DIY Speakers and Subs   04-20-2015, 05:31 PM
Replies: 30
Views: 204
Posted By diy speaker guy
Just a few comments. 1. I'd rather see a 1m...

Just a few comments.

1. I'd rather see a 1m (or 2m or 10m) measurement done outside well away from boundaries than a close mic measurement for this. Close mic is ok but it's not really the same....
Forum: DIY Speakers and Subs   04-20-2015, 04:07 PM
Replies: 26
Views: 602
Posted By diy speaker guy
So... here's a quick comparison of Ghorn with the...

So... here's a quick comparison of Ghorn with the TC driver vs the SPL Dynamics driver.

Pic 1 - Ghorn shown with TC driver in light grey at 2600 watts vs SPL Dynamics at just over 300 watts, both...
Forum: DIY Speakers and Subs   04-20-2015, 03:09 PM
Replies: 33
Views: 353
Posted By diy speaker guy
Why not post a link to the design, some pictures...

Why not post a link to the design, some pictures of the box and the name of the guy that sold it to you? No one can figure out anything based on the little bit of info you have given. Flutter is...
Forum: DIY Speakers and Subs   04-20-2015, 02:07 PM
Replies: 26
Views: 602
Posted By diy speaker guy
Probably no other off the shelf driver is going...

Probably no other off the shelf driver is going to work. When you get into ultra high excursion you usually also have ultra high inductance and that messes up your response curve.

I've posted...
Forum: DIY Speakers and Subs   04-20-2015, 12:15 PM
Replies: 26
Views: 602
Posted By diy speaker guy
No, do you want me to? Which model and for what...

No, do you want me to? Which model and for what design?
Forum: DIY Speakers and Subs   04-20-2015, 11:19 AM
Replies: 26
Views: 602
Posted By diy speaker guy
Two of these drivers still has 1/3 less linear...

Two of these drivers still has 1/3 less linear displacement than a single LMS. An the LMS is particularly forgiving of inductance effects. So it's not fairy dust but it is a very good driver.
...
Forum: DIY Speakers and Subs   04-20-2015, 08:05 AM
Replies: 26
Views: 602
Posted By diy speaker guy
You can't pick replacement horn drivers off the...

You can't pick replacement horn drivers off the top of your head, there's a bit more to it than that. This driver doesn't have much xmax for a sub 20 hz tuning (3x less than the TC Ghorn driver and...
Forum: DIY Speakers and Subs   04-19-2015, 01:05 PM
Replies: 26
Views: 602
Posted By diy speaker guy
There's a huge difference between the mediocre TT...

There's a huge difference between the mediocre TT design with a cheap 8 inch driver and Ghorn with a $1000 driver. Not even sure what you are looking for when mentioning these two in the same thread...
Forum: DIY Speakers and Subs   04-19-2015, 01:03 PM
Replies: 26
Views: 602
Posted By diy speaker guy
Assuming you are wanting a horn with tuning under...

Assuming you are wanting a horn with tuning under 20 hz, there aren't that many that I know of to choose from. BFM doesn't have anything remotely close.

SO... the choices I know of off the top...
Forum: DIY Speakers and Subs   04-19-2015, 08:16 AM
Replies: 26
Views: 602
Posted By diy speaker guy
If you want to list all the designs that do have...

If you want to list all the designs that do have readily available drivers it's going to be a long list, and that list is going to include a lot of free designs that outperform the BFM stuff for the...
Showing results 1 to 25 of 497

 
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