ATC SM75-150 Waveguide

Tenson · 8th July 2011, 10:47 PM

Hi,

Can anyone comment on the effect of the waveguide in the ATC SM75-150 mid? I've seen a faceplate kit on Solen to replace it for one without a waveguide. If I removed the waveguide I could probably mount my tweeter about 1cm closer to the mid, is it worth it? Will I get a wider top end dispersion without it?

Charles Darwin · 9th July 2011, 10:44 AM

I suppose but the waveguide is one of the best things about that driver.
It has some beautiful off axis curves with it.

I would have thought that it is the ATCs magnet size which determines the distance to the tweet.

Tenson · 9th July 2011, 11:24 AM

Your probably right. I find it hard to believe that small waveguide can hold the directivity down to the lower range of the driver, but looking at the aeronet plots it does seem to do well at least until 30deg. I'll keep it as it is

inrank · 9th July 2011, 01:44 PM

New Audiosmile speaker with the ATC 3" dome in the works?

Tenson · 9th July 2011, 02:19 PM

Possibly, but it is a long way off. Would be quite pricey too.

domtweaker · 9th July 2011, 02:29 PM

I have tested both with the Solen plates and with the wave guide .
Sounds much more open with Solen plates for sure .
Less directional too .

Tenson · 9th July 2011, 02:32 PM

Do you have any measurements for off-axis response?

domtweaker · 9th July 2011, 02:34 PM

no I dont but I have a good ear and sounds much better

make out a template out of plywood 1/8 inch and do the test yourself

jackies · 10th July 2011, 12:27 AM

I was wondering if it's possible to remove the waveguide from these, but when I unscrewed the screws, the top comes off together with the actual dome.
Did I miss something?

domtweaker · 10th July 2011, 01:32 AM

I had it done so no idea but be carefull they are not cheap to fix .

ask before you get in trouble

8th July 2011, 10:47 PM	#1
Tenson diyAudio Member Join Date: Feb 2006 Location: Kent	ATC SM75-150 Waveguide Hi, Can anyone comment on the effect of the waveguide in the ATC SM75-150 mid? I've seen a faceplate kit on Solen to replace it for one without a waveguide. If I removed the waveguide I could probably mount my tweeter about 1cm closer to the mid, is it worth it? Will I get a wider top end dispersion without it?

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9th July 2011, 10:44 AM	#2
Charles Darwin diyAudio Member Join Date: Nov 2009 Location: Birmingham, UK	I suppose but the waveguide is one of the best things about that driver. It has some beautiful off axis curves with it. I would have thought that it is the ATCs magnet size which determines the distance to the tweet.

9th July 2011, 11:24 AM	#3
Tenson diyAudio Member Join Date: Feb 2006 Location: Kent	Your probably right. I find it hard to believe that small waveguide can hold the directivity down to the lower range of the driver, but looking at the aeronet plots it does seem to do well at least until 30deg. I'll keep it as it is

9th July 2011, 01:44 PM	#4
inrank diyAudio Member Join Date: Oct 2005	New Audiosmile speaker with the ATC 3" dome in the works?

9th July 2011, 02:19 PM	#5
Tenson diyAudio Member Join Date: Feb 2006 Location: Kent	Possibly, but it is a long way off. Would be quite pricey too.

9th July 2011, 02:29 PM	#6
domtweaker diyAudio Member Join Date: Jan 2006 Location: big city	I have tested both with the Solen plates and with the wave guide . Sounds much more open with Solen plates for sure . Less directional too .

9th July 2011, 02:32 PM	#7
Tenson diyAudio Member Join Date: Feb 2006 Location: Kent	Do you have any measurements for off-axis response?

9th July 2011, 02:34 PM	#8
domtweaker diyAudio Member Join Date: Jan 2006 Location: big city	no I dont but I have a good ear and sounds much better make out a template out of plywood 1/8 inch and do the test yourself

10th July 2011, 12:27 AM	#9
jackies diyAudio Member Join Date: Nov 2007	I was wondering if it's possible to remove the waveguide from these, but when I unscrewed the screws, the top comes off together with the actual dome. Did I miss something?

10th July 2011, 01:32 AM	#10
domtweaker diyAudio Member Join Date: Jan 2006 Location: big city	I had it done so no idea but be carefull they are not cheap to fix . ask before you get in trouble

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