1" compression drivers with 2" diaphragms

454Casull · 8th June 2007, 12:41 AM

Why aren't there any?

CeramicMan · 8th June 2007, 01:32 AM

Wouldn't that depend on the horn design?

40mm voice coil, 25mm throat diameter from Visaton

Is that the sort of thing you're looking for?

tinitus · 8th June 2007, 01:38 AM

This one is close - 1" with 45mm voicecoil

http://www.bmspro.info/index.php?sho...10278&id=54364

New 1.4" coaxial with 90mm voice coil, low xo point

http://www.bmspro.info/index.php?sho...279&id=5059986

454Casull · 8th June 2007, 10:41 PM

I guess 1.6" is the max, huh? What happens once you make it bigger than that?

tinitus · 8th June 2007, 10:52 PM

Obviously the result will be a midrange driver with high end rolloff

A bit strange as there are lots of "normal" and much bigger fullrange drivers ?

It appears that cone break up may be a problem, and might be related to the light cones demanded fore the high efficiency

454Casull · 9th June 2007, 12:20 AM

So it's got nothing to do with the phase plug? i.e. 2" worth of diaphragm can still be "squeezed" into 1"?

djk · 9th June 2007, 01:24 AM

A 44.4mm diaphragm has been traditional for a 1" throat, but you can make about any size you want.

The EV DH2 is a 2" diapragm and a 1" exit.

CeramicMan · 9th June 2007, 03:06 AM

Considering that the wavelength of a 20kHz sine wave is only about 17mm, or 0.67", I think there might be some actual physical constraints that inhibit a good horn design if the diaphragm is too wide compared to the throat.

djk · 9th June 2007, 03:13 AM

That's what the phase plug is for.

Standard spacing in Altec/JBL is for 16Khz.

TAD added an extra slit for 20Khz in their models.

454Casull · 17th June 2007, 06:11 PM

Why not use a .75" or even a .5" throat, then? If I understand correctly, you get better high-frequency dispersion (and less HOM, according to Geddes) that way.

8th June 2007, 12:41 AM	#1
454Casull diyAudio Member Join Date: Jan 2004 Location: Toronto, ON, Canada	1" compression drivers with 2" diaphragms Why aren't there any? __________________ Building a 2.1 system out of a 3/4"x4'x8' sheet

8th June 2007, 01:32 AM	#2
CeramicMan diyAudio Member Join Date: Nov 2003 Location: Brisbane, QLD	Wouldn't that depend on the horn design? 40mm voice coil, 25mm throat diameter from Visaton Is that the sort of thing you're looking for? __________________ Lech

8th June 2007, 10:41 PM	#4
454Casull diyAudio Member Join Date: Jan 2004 Location: Toronto, ON, Canada	I guess 1.6" is the max, huh? What happens once you make it bigger than that? __________________ Building a 2.1 system out of a 3/4"x4'x8' sheet

9th June 2007, 12:20 AM	#6
454Casull diyAudio Member Join Date: Jan 2004 Location: Toronto, ON, Canada	So it's got nothing to do with the phase plug? i.e. 2" worth of diaphragm can still be "squeezed" into 1"? __________________ Building a 2.1 system out of a 3/4"x4'x8' sheet

9th June 2007, 01:24 AM	#7
djk diyAudio Member Join Date: Feb 2001 Location: USA	A 44.4mm diaphragm has been traditional for a 1" throat, but you can make about any size you want. The EV DH2 is a 2" diapragm and a 1" exit. __________________ Candidates for the Darwin Award should not read this author.


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8th June 2007, 01:38 AM	#3
tinitus diyAudio Moderator Join Date: Nov 2005	This one is close - 1" with 45mm voicecoil http://www.bmspro.info/index.php?sho...10278&id=54364 New 1.4" coaxial with 90mm voice coil, low xo point http://www.bmspro.info/index.php?sho...279&id=5059986

8th June 2007, 10:52 PM	#5
tinitus diyAudio Moderator Join Date: Nov 2005	Obviously the result will be a midrange driver with high end rolloff A bit strange as there are lots of "normal" and much bigger fullrange drivers ? It appears that cone break up may be a problem, and might be related to the light cones demanded fore the high efficiency

9th June 2007, 03:06 AM	#8
CeramicMan diyAudio Member Join Date: Nov 2003 Location: Brisbane, QLD	Considering that the wavelength of a 20kHz sine wave is only about 17mm, or 0.67", I think there might be some actual physical constraints that inhibit a good horn design if the diaphragm is too wide compared to the throat. __________________ Lech

9th June 2007, 03:13 AM	#9
djk diyAudio Member Join Date: Feb 2001 Location: USA	That's what the phase plug is for. Standard spacing in Altec/JBL is for 16Khz. TAD added an extra slit for 20Khz in their models. __________________ Candidates for the Darwin Award should not read this author.

17th June 2007, 06:11 PM	#10
454Casull diyAudio Member Join Date: Jan 2004 Location: Toronto, ON, Canada	Why not use a .75" or even a .5" throat, then? If I understand correctly, you get better high-frequency dispersion (and less HOM, according to Geddes) that way. __________________ Building a 2.1 system out of a 3/4"x4'x8' sheet

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