Originally Posted by omholt
Ok. I'm a little uncertain how to calculate the SPL since it's a line array. A SPL calculator gives me 105,8 dB with two speakers at 3 feet with 200W. But that's with a regular speaker which looses -6 dB pr meter. With a distance of 6 feet, the max SPL should be around 102 dB. Ok, that's what you said.
What I meant by "13-14 dB at 8 Khz" or which is now corrected to 12 dB (102 -90) is what peaks they can tolerare if I'm playing as loud as at 90 dB. And again, I would refute that high peaks so high in frequency happens much in music. Like I said earlier, that would burn up many tweeters in speakers. High peaks are more common much lower in frequency and as you know the SPL capability of CBT36 goes up. At 800 Hz it's 89 dB and at 300 Hz it's 94 dB. Also, an average listening level of 90 dB is quite high. Most probably listen more in the 80-85 dB level, thus a max of 102 dB is sufficient with a normal listening window. Overall, it's not much of limitation for home use at all, unless the distance is great or if you the type of guy that cranks up the volume to 100 dB. Sure, then you need a lot more power a more efficient speaker.
Anyway, I got the feeling that you were saying that SPL was a serious restriction with the CBT design itself. But look like you agree that with higher sensitive drivers it isn't really an issue at all but more related to cost. The CBT36XL has been mentioned and should be able to play much louder in the very highs. If it's needed or not, depends on the usage.
About the waveguide speaker. Yes, the woofer brings the overall sensitivity down to 97 dB. Still, it gives an impression of the potential limitation of sensitivy with the CBT36. The CBTs has much more energy and are far more transparent sounding in the highs. Listening to a guitar, a flute etc, the waveguide speaker is simply not able to reproduce it like the CBT36 does with a feeling that you are listening to a real instrument. I don't think you can say for certain that higher sensitivty with CBTs will yield better sound. Maybe, maybe not. It's something very else when the speaker has a large group of drivers as oppose to a single one. I believe thermal modulation matters (nonlinear distortion isn't considered an issue) and it's the reason why higher sensitivty speaker sound more effortless. But with 144 drivers as oppose to two, I'm not so sure thermal modulation is a problem at all.
Yes. You not only avoid vertical specular reflections and floor bounce, you also get a very even frequency response down to schroeder. I have had other speakers with controlled directivity but not so far down in frequency. The result is that the CBT36s has given me the flattes response I've ever had. Even in a small room with a low cathedral ceilling, I'm close to get the graph within +/-3dB with 24 oct. smoothing (using two subs). They are also they only speakers I've heard that I thought sounded very good with no sidewall treatment in a narrow room. I believe that's because the horizontal response is so even which, despite of reflections, makes the speakers sound natural. A speaker with only CD above 1KHz sound weird to me without sidewall treatment. The only other speaker I know can give controlled directivity down to schroeder for home use is a corner horn. Anything else, end up being too large for homes in most cases.
The corner horn like Klipsch Jubilee is very interesting though and something I'm considering getting for a setup nr. 2.