K
karma
Guest
HI Folks,
I have question and a theory about the CLSIIA's. Being a dipolar radiator, it is a law of physics that the in phase front and back waves will cancel at a certain frequency. The cancellation frequency is determined by the outside of the speaker frame. As the wavelength of the reproduced sound approaches the dimensions of the speaker frame, front to rear cancellation starts. Further, the cancellation effect will start at a significantly higher frequency than where total cancellation occurs. I assume the upper frequency where cancellation starts is about an octave above. Please correct me if I don't have that right. Right or wrong, the issue does not change; just the frequencies.
For discussion sake, let’s assume total cancellation occurs at 35 Hz. With our numbers, the cancellation effect would start at 70 Hz, up one octave. From 70 Hz down more and more cancellation will occur. This adds up to bass roll off starting at 70 Hz. Can the CLS claim to be full range with bass rolling off from 70 Hz down especially when it is specified down to 35 Hz?? I don't think so.
Here's my question. Does the CLS have bass equalization built into the electronics module to counteract this natural bass roll off? I believe it does. If so, the lower bass frequencies are significantly boosted. In a stat panel the result is the diaphragm excursions must be greater in order to obey the equalization. Nothing wrong yet. But, what happens to the dynamic range? Since dynamic range is limited by the stator spacing, the diaphragm will run out of room and start hitting the stators. Serious distortion and sparks, maybe. This is very bad as you know. The result is a significant reduction of dynamic range in the low bass. If I have this figured right, this is another argument for subwoofers and high pass filters in a biamped configuration.
So, that's my question and theory. I would very much like to hear your thoughts on this. Inquiring minds want to know.
Sparky
Edited to correct for my poor memory: Walker corrected my incorrect use of the term Bipolar. I meant Dipolar. Thank's Walker. I've always had a hard time keeping the two terms straight. I also changed the phase reference.
I have question and a theory about the CLSIIA's. Being a dipolar radiator, it is a law of physics that the in phase front and back waves will cancel at a certain frequency. The cancellation frequency is determined by the outside of the speaker frame. As the wavelength of the reproduced sound approaches the dimensions of the speaker frame, front to rear cancellation starts. Further, the cancellation effect will start at a significantly higher frequency than where total cancellation occurs. I assume the upper frequency where cancellation starts is about an octave above. Please correct me if I don't have that right. Right or wrong, the issue does not change; just the frequencies.
For discussion sake, let’s assume total cancellation occurs at 35 Hz. With our numbers, the cancellation effect would start at 70 Hz, up one octave. From 70 Hz down more and more cancellation will occur. This adds up to bass roll off starting at 70 Hz. Can the CLS claim to be full range with bass rolling off from 70 Hz down especially when it is specified down to 35 Hz?? I don't think so.
Here's my question. Does the CLS have bass equalization built into the electronics module to counteract this natural bass roll off? I believe it does. If so, the lower bass frequencies are significantly boosted. In a stat panel the result is the diaphragm excursions must be greater in order to obey the equalization. Nothing wrong yet. But, what happens to the dynamic range? Since dynamic range is limited by the stator spacing, the diaphragm will run out of room and start hitting the stators. Serious distortion and sparks, maybe. This is very bad as you know. The result is a significant reduction of dynamic range in the low bass. If I have this figured right, this is another argument for subwoofers and high pass filters in a biamped configuration.
So, that's my question and theory. I would very much like to hear your thoughts on this. Inquiring minds want to know.
Sparky
Edited to correct for my poor memory: Walker corrected my incorrect use of the term Bipolar. I meant Dipolar. Thank's Walker. I've always had a hard time keeping the two terms straight. I also changed the phase reference.
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