The number in the model name is the cabinet internal volume in litres so the 100 has twice the volume and 150 3 times the 50.
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ATC speakers / Monitors
- Thread starter Pearljam5000
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This one is likely most close to ATC:
https://www.madisoundspeakerstore.c...k-ellipticor-d8404/552000-84mm-dome-midrange/
Attention! The price is: $2,549.50
Yep this is the most similar I've seen (well, mostly).
Count Arthur
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Internal design. Underhung coil, shorting ring (vs ATC's SLMM ring which largely accomplishes the same thing), double suspension.
The Volt looks like the ATC but shares very little in common and is actually much less good. Overhung, much lower excursion limits (±1mm vs ±2.4 and ±3 for the Scan and the ATC respectively), limited LFX compared to the ATC and Scanspeak both of which can be crossed comfortably with 4th order crossovers around 400hz - the Volt really can't be crossed much below 500 or so even with 4th order filters.
About the only thing the Volt shares in common is the double suspension and the small integrated waveguide.
OP
Pearljam5000
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How much is the driver new ?
OP
Pearljam5000
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Some measurements
The Volt waveguide is actually different from the ATC, the former being straight and the latter being curved at present. The very old ATC waveguide was straight.
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Although this is the non-S version, it's still very good. Smooth frequency and impedance response, even dispersion, low harmonic distortion etc. Plus there is a rare feature amongst dedicated midrange drivers and double suspension drivers: this (and also the S version) have a very high Qms, which usually means very low mechanical losses (the higher the Qms the lower the mechanical losses all else equal), I bet you can't find a midrange driver with higher (or similar) Qms than the ATC mid-dome have.
This is an old SM75-150 with the straight waveguide, it can be even more than 40 years old.
Yes the units in my 42 year old ProAc EBS are like these.
It is not available but when it was they were about $700 each or so.
OP
Pearljam5000
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SM75-150S
Is the newest version ?Newest version appear to be £1025 each inc. VAT, according to the most recent price list I can find online (2021)
There was always SM75-150 non-S and S versions, the main difference is the magnet size and it's effect. The S version have a larger magnet, so the drive is stronger, the sensitivity/efficiency is higher.
Also there is probably some difference in the suspension.
OP
Pearljam5000
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The S version has a higher Bl product because of the more powerful magnet, and that affects the other t/s parameters (and FR). The S has a bit better HF linearity.
This is why you should never clean the ATC woofer's diaphragm with water, it dissolves the coating (/facepalm):
https://avxforum.hu/forum/viewtopic.php?p=2887101#p2887101
https://avxforum.hu/forum/viewtopic.php?p=2887101#p2887101
Well, good to know it's a water based dope.
OP
Pearljam5000
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Is it OK to clean it with a different material ?
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