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  1. Y

    ATC speakers / Monitors

    There is another 'hifi' style 15" woofer, the SB100-375 SC and LC, the larger diameter (hence larger surface area for heat distribution/dissipation) voice coil allows a greater power handling of 200/400W. Maybe this driver is used in the SCM0.1/15SL Pro sub.
  2. Y

    ATC speakers / Monitors

    Okay, but thermal/power compression comes from heat. The relative low power handling of e.g. the SB75-375 SC comes from it's not very high heat dissipation capacity, because the surface area of the voice coil is small. It will heat up by relative low power, so the power compression starts at...
  3. Y

    ATC speakers / Monitors

    If you think those large underhung motors are the panacea of high power handling, then why only 150/300W is the power handling of the SB75-375 SC? The linked Faital Pro driver have a similar (but overhung) 3" voice coil and it's power handling is 600/1200W. Underhung motors is almost...
  4. Y

    ATC speakers / Monitors

    That's just the output power of the amplifier, the woofer's power handling is still 150/300W if it's the same SB75-375 SC. Okay, but there is not much advantage of the lower Fs (which comes from the higher Cms, so higher Vas) if the enclosure is relative small (relative to Vas), like in the...
  5. Y

    ATC speakers / Monitors

    Lower electrical power handling = power compression sets in earlier, all else equal. There is no magic involved about this.
  6. Y

    ATC speakers / Monitors

    The 15" ATC woofer have foam surround, and is rated to 150/300W, which is still plenty for domestic use, but power compression can creep in earlier when driven hard, compared to a typical 15" pro audio woofer with average 500/1000W power handling and higher sensitivity/efficiency. For example...
  7. Y

    Introducing Denotiva DIY speakers!

    Hi Rick! How do you rate the ND25FW tweeter to the DXT subjectively? I asking because I used the Dayton but didn't heard the Seas yet.
  8. Y

    ATC speakers / Monitors

    The SCM150 (both pro and consumer versions) and the SCM300 woofers still have foam surround.
  9. Y

    ATC speakers / Monitors

    I meant compared to a rigid suspension pro audio driver with multi-hundred (or even thousand) Watts load capacity. The soft suspension with the foam surround cant take big abuse. But sure it can play loud at home environment.
  10. Y

    ATC speakers / Monitors

    They looks similar but probably that's all. The Genelec is more of a sturdy pro audio woofer, the ATC is like a fragile 'hifi' woofer. Here's an example that looks similar, but here the coating is completely waterproof to protect the cone from the moisture...
  11. Y

    ATC speakers / Monitors

    Maybe yes (I think it actually depends) but the reconing would be about 300 Euros, including postage. This is not much money considering the price of the speaker. Anyway, we don't know precisely how ATC coates their woofer cones, maybe it have to be removed from the basket and the process more...
  12. Y

    ATC speakers / Monitors

    And different sensitivity with possible moving mass distribution imbalance. I think the response from ATC is thoughtful.
  13. Y

    ATC speakers / Monitors

    Recoating is not satisfactory according to ATC. Here is their response: “ Our Drive Unit Production Manager has advised that recoating the drive unit wouldn’t really help, it would need to be reconed or just left as it is.”
  14. Y

    ATC speakers / Monitors

    This is what the user manual says about cleaning: "High technology material finishes are used in this product. The surfaces are durableand with a little care can be kept as good as new even under conditions of heavyuse. Normally a dry duster will be all that is required to keep the finishes...
  15. Y

    ATC speakers / Monitors

    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
  16. Y

    ATC speakers / Monitors

    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.
  17. Y

    ATC speakers / Monitors

    This is an old SM75-150 with the straight waveguide, it can be even more than 40 years old.
  18. Y

    ATC speakers / Monitors

    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...
  19. Y

    ATC speakers / Monitors

    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.
  20. Y

    ATC speakers / Monitors

    Well, this is surprising but I can imagine that they are doing like this.
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