3"or 4" driver with very good dispersion and high xmax? - Page 5 - diyAudio
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Old 28th September 2012, 06:32 PM   #41
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Seems a pretty complete description of how they were measured to me. What more do you want to know? Mark may have given a bit more detail in his Alpair 7.3 thread.

dave
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Old 28th September 2012, 06:39 PM   #42
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Seems a pretty complete description of how they were measured to me. What more do you want to know? Mark may have given a bit more detail in his Alpair 7.3 thread.

dave
Maybe I missed it but what is the mic distance, test signal, frequency resolution, smoothing, windowing, driver mounting?
And again, I believe it's important to look at all angles and not just 0-30. The walls in our rooms care about other angles too

Last edited by markus76; 28th September 2012 at 06:42 PM.
 
Old 28th September 2012, 06:50 PM   #43
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No smoothing AFAIK, likely 1m mic distance since that would be far-field for a 4" driver (ref Toole: measurements need to be taken in the farfield and scaled to 1m distance), driver mounted in an IEC box, with thin aluminum baffle. Taken with LEAP i believe.

Measures ideally go out to at least 90 degrees, but still this is better than just on-axis.

Go over to the Mark Audio forum and ask him for details.

dave
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Old 28th September 2012, 07:00 PM   #44
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Well, I thought people here actually have measured drivers themselves that's why I've started the thread.
 
Old 28th September 2012, 08:04 PM   #45
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Here is the off axis of the EL70.

Click the image to open in full size.

Take a look at the bunching happening at 5khz. People who know more about driver mechanics than I do could say, but I think this is indicative of the first signs of cone breakup. The phase is changing from the outside of the cone relative to the inside. It may also be related to moving the treble onto the dustcap. Either way, that spreadat 3khz followed by gathering at 5khz would technically be considered bad.

Despite this, you can see that it has uniform dipersion up to the top octave out to 45d. It resembles the alp7. This is a Mark Audio built driver, and some here (Dave?) may be able to tell you if it's similar to the alp7 cone. I believe the alp7 cone is superior because it's a later gen product, and my ears tell me it is

EDIT - note my measurements are on a 5db scale and Mark's are 10db, just so it isn't confused. They're actually fairly similar (trends).

Last edited by tuxedocivic; 28th September 2012 at 08:12 PM.
 
Old 29th September 2012, 05:00 PM   #46
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Well, I thought people here actually have measured drivers themselves that's why I've started the thread.
Many do. The big advantage in DIY is we can measure in OUR box, our baffle etc. I only worry about 15 degrees. because I know how I am going to use my speakers.
 
Old 29th September 2012, 05:28 PM   #47
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Many do. The big advantage in DIY is we can measure in OUR box, our baffle etc. I only worry about 15 degrees. because I know how I am going to use my speakers.
In an unechoic chamber?
 
Old 29th September 2012, 07:18 PM   #48
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Are you interested in the sub 200hz or something? 200hz+ is pretty easy to get. I just measured an SDX7 woofer outside with reasonable accuracy down to 150hz. Then do a near field for 200hz down.
 
Old 13th July 2013, 11:29 AM   #49
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Hi guys,

Sorry for reviving an old thread but can anybody provide off-axis data for the Tang Band W3-1797S?
Any other interesting new 3" drivers with wide dispersion and high SPL capabilities on the market?
 
Old 17th February 2014, 01:54 PM   #50
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This is a nice one:

Click the image to open in full size.

dave
Here's the Alpair 7.3 in a 43x43cm box from 0 to 90:

Click the image to open in full size.

(90cm mic distance, gated at 4,7ms)

Looks like a totally different driver.

Here's 0-90 - pretty ugly:

Click the image to open in full size.
Attached Images
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File Type: png alpair7.3-0-90deg.png (64.3 KB, 505 views)
 

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