ShinOBIWAN said:
What would you equate the ATCs upper amplitude limit (~600hz XO) as far as power compression, distortion, etc? Would they be able to keep up with a compression driver at 2-2.5khz or are they just direct radiators with good dynamics?
I'm most interested in their capability above 110dB, right around 1w/1m for a quality CD
thadman said:
Well the figures shown at the beginning of this thread were taken at 96dB/1m. 110dB and clean performance is a big ask of any driver. I really wouldn't like to speculate about such things considering the $700 price tag of an ATC mid. My guess is that it would happily play in the 600hz+ range with steep 4th order+ filters at those levels and still remain subjectively clean. I'd think THD would be in the 2% range across the passband but that's a guess based on previous performance and assuming a relatively linear rise in distortion with regards to output.
The ATC would have no problem keeping up with the dynamics of a compression driver. The problem is that the ATC doesn't have the same colourations so it would be interesting to see what happens when the two are paired.
tinitus said:Just wonder about those 110db...can sound be called hifi at such levels
Thadman mentioned 110dB at 1m. A realistic listening distance is around 3m making that 98dB. Considering peaks of upto 12dB in average music content then you can take that down to 86dB average SPL. This is all pretty sobering because most systems have no hope of conveying realistic transients and peaks at decent distortion and without compression.
The spacing between the drivers is a consequense of their physical dimensions as you could see in the attached image. It is the S-version and I cross them electronic at approx. 1400 hz.
Compared to use "only" one mid per channel my subjective impression is that this configuration gives a more precise and controlled "soundstage" and more "body" to voices etc.
. It is the S-version and I cross them electronic at approx. 1400 hz.Compared to use "only" one mid per channel my subjective impression is that this configuration gives a more precise and controlled "soundstage" and more "body" to voices etc.
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m0tion said:
Agreed. Those ATC are addictive so the more the better
Despite the smallish picture I believe the visible bass driver is a 9" ATC probably SB75-234 in either SC or LC variant. The SA planar is another well regarded driver. You might remember Thylantyr who uses about 8 or so per side in line arrays. Alcons and SLS also have best of breed planars but these aren't available to DIY'ers sadly. I think the Alcons is designed by the same chap who originally did the SA.
m0tion said:
Yep, SA is well regarded but mainly in pro circles. They can take a large amount of punishment and distortion is frighteningly low. Only real problem is that you have to fashion your own front plate or use the horrible horn that SA can provide.
http://www.stageaccompany.com/en/products/ribboncd.php
There was some measurement knocking around on the net. Try Google. Also take a look at Alcons who do a beefier version of the SA in a line source. There's some distortion figures on that and I think I remember it as being around 1% at 120dB!
m0tion said:
The bass driver is ATC SB75-234 SC. The cabinets where made about five years ago and I´m still not shure what kind if configuration I should go for. I have more bass units of the same kind and a pair of ATC SB100-375 SC to choose from
.The crossover is of the swedish brand "Supreme" and is custom built for this application. I will try to make som kind of measurements in the next weekend.
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