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Old 8th July 2011, 11:47 PM   #1
Tenson is offline Tenson  United Kingdom
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Default 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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Old 9th July 2011, 11:44 AM   #2
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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.
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Old 9th July 2011, 12:24 PM   #3
Tenson is offline Tenson  United Kingdom
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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
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Old 9th July 2011, 02:44 PM   #4
inrank is offline inrank  United Kingdom
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New Audiosmile speaker with the ATC 3" dome in the works?
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Old 9th July 2011, 03:19 PM   #5
Tenson is offline Tenson  United Kingdom
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Possibly, but it is a long way off. Would be quite pricey too.
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Old 9th July 2011, 03:29 PM   #6
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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 .
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Old 9th July 2011, 03:32 PM   #7
Tenson is offline Tenson  United Kingdom
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Do you have any measurements for off-axis response?
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Old 9th July 2011, 03:34 PM   #8
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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
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Old 10th July 2011, 01:27 AM   #9
jackies is offline jackies  United States
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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?
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Old 10th July 2011, 02:32 AM   #10
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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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