3"or 4" driver with very good dispersion and high xmax? - Page 4 - diyAudio
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Old 28th September 2012, 07:05 AM   #31
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The 3" is toghter, but the nice even spacing -- equally important -- is better on the 4"

dave

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Old 28th September 2012, 07:09 AM   #32
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The 3" is toghter, but the nice even spacing -- equally important -- is better on the 4"
Not sure which spacing you're referring to?
 
Old 28th September 2012, 11:46 AM   #33
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Check out the TB W4-1996.
 
Old 28th September 2012, 12:15 PM   #34
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Check out the TB W4-1996.
Thanks but it doesn't seem to be produced anymore? Is there any polar data available?
 
Old 28th September 2012, 01:18 PM   #35
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Markus, I know this is probably a silly question as you are posting in the full range forum, but what frequency range are you planning on using it over? I bought some SB accoustics 4" midrange drivers which look very nice on paper (sound pretty nice in their cardboard shipping boxes as well). I'm going to attempt to run the full range (which may not succeed even though I can't hear much above 13K). Unfortunately a house purchase and subsequent diy painting of said house has shelved that project for now. Three possible options:
SB Acoustics :: 4? SB12NRX25-4
SB Acoustics :: 4" SB12NRXF25-4
SB Acoustics :: 4" SB12MNRX25-4

I've got the last one, build quality is very good! graph attached, but polar is only 30 and 60deg. Only about 5db down at 10K at 30deg.

Tony.
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Old 28th September 2012, 01:27 PM   #36
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Not sure which spacing you're referring to?
I think Dave is referring to the way the off axis response follows the on axis response in an even manner. ie gradually widening as frequency goes up with no deviations from the original on axis response, just x db down.

Tony.
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Old 28th September 2012, 01:55 PM   #37
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what frequency range are you planning on using it over?
Full range >80Hz
 
Old 28th September 2012, 01:57 PM   #38
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I think Dave is referring to the way the off axis response follows the on axis response in an even manner. ie gradually widening as frequency goes up with no deviations from the original on axis response, just x db down.

Tony.
If that's what he meant then we would need to look much closer - and wider We don't know how his measurements were taken, which is also true for mine.
 
Old 28th September 2012, 05:30 PM   #39
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Quote:
Originally Posted by wintermute View Post
I think Dave is referring to the way the off axis response follows the on axis response in an even manner. ie gradually widening as frequency goes up with no deviations from the original on axis response, just x db down.
Wxctly. THis is,according to Toole an important asswt.

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If that's what he meant then we would need to look much closer - and wider We don't know how his measurements were taken, which is also true for mine.
Mark's measures were taken an a large anechoic chamber, with a professional level calibrated mic by guys who know what they are doing
dave
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Old 28th September 2012, 05:36 PM   #40
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Mark's measures were taken an a large anechoic chamber, with a professional level calibrated mic by guys who know what they are doing
Xactly So do you know how those measurements were taken or do we need to "trust but don't verify"?
 

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