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Old 22nd August 2010, 03:00 AM   #7281
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Originally Posted by IslandPink View Post
Sorry to interrupt the research ....

Just thought Gary and Lynn might like the attached pic of my first Jensen bass unit for the combination . I know it took me a barely finite amount of time to do this, but I'm quite proud of the woodwork !

I got some autoformers for the 288-H's from Dave a while back, and it was nice to find the horns sounded the same with or without the autoformers .

Good effort Dave!

Mark
Wow! Now that's classy! Very impressed with the quality and beauty of the cabinetry. Gary and Mark are doing impressive work. Still meditating on the resistive-vent alignment suggested by Planet10 for an Altec 416/TD15M type of driver - a scaled-up version of the Fonken. Out of curiosity, Mark, what are the cabinet dimensions?

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Originally Posted by doug20 View Post
FWIW, Paul W. built a pretty good MTM speaker that had rave reviews during a DIY event in Atlanta.

It uses the 18sound wavguide (XT1464)/1.4 CD (ND1460A). I think its breakup was up past 14KHz.

The measurements are here.

HTGuide Forum - View Single Post - The Raptor ... a 10" MTM
Conveniently enough, I already have a pair of 18Sound XT1464 horns on hand, and the throat flare of the aluminum-diaphragm ND1460A is compatible with the AH425 horn, so a comparison between the three large-format compression drivers (288, 745PB, ND1460A) is quite possible.
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Last edited by Lynn Olson; 22nd August 2010 at 03:18 AM.
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Old 22nd August 2010, 03:01 AM   #7282
g3dahl is offline g3dahl  United States
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Originally Posted by soongsc View Post
45 deg tangent point before the lip is how far from the horn throat on axis?
Not sure what you mean, sorry!

Gary Dahl
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Old 22nd August 2010, 05:42 AM   #7283
soongsc is offline soongsc  Taiwan
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Originally Posted by g3dahl View Post
Not sure what you mean, sorry!

Gary Dahl
When the horn flares, there is a point where the tangent line is 45 deg to the center axis. How far is that point from the horn throat entry point as measured along the center axis?
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Old 22nd August 2010, 12:27 PM   #7284
doug20 is offline doug20  United States
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Originally Posted by g3dahl View Post
Those measurements look great. I remember looking at that driver, but the manufacturer's curve didn't look nearly so good. Is that an unequalized measurement?

If so, and if it is compatible with the AH-425, it would definitely be worth a try!

Gary Dahl

That is a good question. I can not answer it.
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Old 22nd August 2010, 04:47 PM   #7285
g3dahl is offline g3dahl  United States
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Just read the thread on htguide. Below is just the horn and driver at 2 m, at 0, 10, 20, 30 and 40 degrees off axis. Paul said that the deep notch at 14 kHz didn't happen with his other ND1460A's on his own waveguides.

Click the image to open in full size.

And here is the woofer response:

Click the image to open in full size.

It's an interesting thread. Paul did impressive work to integrate the system so nicely. Wish I could take a listen.

Here's the thread: HTGuide Forum - The Raptor ... a 10" MTM

Gary Dahl
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Old 22nd August 2010, 08:58 PM   #7286
mige0 is offline mige0  Austria
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Originally Posted by soongsc View Post
When the horn flares, there is a point where the tangent line is 45 deg to the center axis. How far is that point from the horn throat entry point as measured along the center axis?
Whats the reason behind ???
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Old 23rd August 2010, 06:37 AM   #7287
soongsc is offline soongsc  Taiwan
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Whats the reason behind ???
That's my personal preference for definition of horn termination point.
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Old 23rd August 2010, 06:39 AM   #7288
soongsc is offline soongsc  Taiwan
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Originally Posted by g3dahl View Post
Just read the thread on htguide. Below is just the horn and driver at 2 m, at 0, 10, 20, 30 and 40 degrees off axis. Paul said that the deep notch at 14 kHz didn't happen with his other ND1460A's on his own waveguides.

Click the image to open in full size.

And here is the woofer response:

Click the image to open in full size.

It's an interesting thread. Paul did impressive work to integrate the system so nicely. Wish I could take a listen.

Here's the thread: HTGuide Forum - The Raptor ... a 10" MTM

Gary Dahl
Diffraction is quite obvious. It would be interesting to see a CSD.
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Old 23rd August 2010, 11:34 AM   #7289
sendler is offline sendler  United States
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Originally Posted by g3dahl View Post
The wavelet ripples at 0.6 ms intervals correspond to distances of about 8 inches. The depth of the AH-425 on axis, without the driver, is 10 inches. The inside wall of the horn measures about 16" from the bugscreen to the edge of the mouth, so I'm not sure of the exact mechanism that is causing the 0.6 ms ripples.
It must be a harmonic of the 16" path length to the edge.
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Old 25th August 2010, 05:11 AM   #7290
soongsc is offline soongsc  Taiwan
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I thought "harmonic" was a frequency domain thing.
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