ATC SM75-150 versus SM75-150S - diyAudio
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Old 29th December 2010, 09:11 PM   #1
Tenson is offline Tenson  United Kingdom
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Default ATC SM75-150 versus SM75-150S

I heard the SM75-150S isn't available anymore. So what is the difference between the S and the non-S version? Is it mainly sensitivity? I've seen Shin's measurements of the SM75-150S and the distortion levels are very impressive, and I wonder how the non-S version compares?
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Old 29th December 2010, 10:45 PM   #2
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I have a pair of the sm75-150s 16 ohm for sale.
Cosmetically not perfect.
About 13-15 years old. Used mostly with a 300B amp. It put out a whopping 5 watts.
PM me if interested.

Last edited by makingmoney; 29th December 2010 at 10:48 PM.
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Old 30th December 2010, 07:24 PM   #3
Tenson is offline Tenson  United Kingdom
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Thanks, but if the only difference is the sensitivity, I think I might rather get a new pair of non-S versions, since 13+ years seems pretty old.

Really, has no-one ever found out the exact differences between these drivers?
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Old 30th December 2010, 08:34 PM   #4
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You could just go to ATCs site and download the zip file (pdf).
But apart from sensitivity, total magnetic flux and flux density they appear identical.
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Old 31st December 2010, 06:49 PM   #5
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From what I have read, the only difference is the sensitivity increase for the S version. The cone assembly is the same for both (the same recone kits work for both versions). If you look at pictures of the units, the S version has a much bigger/stronger magnet which provides the sensitivity increase.

Cheers
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Old 31st December 2010, 08:42 PM   #6
Tenson is offline Tenson  United Kingdom
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One has to wonder then, why ATC use the S version even in their active speakers where sensitivity is not an issue, and also in their passive ones with low sensitivity.

I did email ATC to ask the difference, but I guess they are on holiday at the moment since they haven't replied for a couple of days.
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Old 31st December 2010, 09:09 PM   #7
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It has to keep up with up to two 15" woofers while maintaining sufficient headroom for un-compressed signals. 3dB can count for a lot at times.
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Old 31st December 2010, 10:09 PM   #8
Tenson is offline Tenson  United Kingdom
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I think you're confusing sensitivity with maximum SPL. Some of the speakers using the S version only have ~86dB sensitivity.

Last edited by Tenson; 31st December 2010 at 10:14 PM.
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Old 1st January 2011, 11:06 PM   #9
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Both s and non-s only come in 16Ohm impedance so in a passive set up you only get 88dB for 2.83V from a non-s.
And in the larger actives it needs to keep up with twin woofers in terms of maxSPL.
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Old 2nd January 2011, 12:02 AM   #10
Tenson is offline Tenson  United Kingdom
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Oh yeah you're right. The spec sheet says sensitivity, but then they quote output for 1watt rather than voltage.
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