 ygoh wrote: | | 1.) Why is it that you do not support using teo compression drivers in the same throat? Is the distortions increases, such as wavefront distortion? |
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Sure the wavefront gets spread; it is what Wilson does in his WAMM system. The drivers are never the same. There are always are small between them, so what you have two drivers, with own necks to drive the same throat it is an opportunity for problems. I do not even go into the discussion how the axes of two drivers face the same not perpendicular throat. Try to angle a single driver from the horn throat or offset their centers – you will see the result. How pretend that you have two 45 degree drivers firing into the same hole.
| ygoh wrote: | | 2.) What are the main reasons of using two compression drivers at the same throat, beside shortening the horn's length? |
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Increase pressures nothing else. Double drivers do not shorten the horn's length – the double size throat does it. The double compression drivers use very commonly in past. Do not forget however that compression drivers in past were only about developing maximum acoustic pressure, there was very little consideration about quality of sound. Put in this way- they were not applied consideration and way less inferior then what he have noonday for home system. So, the RCA, Altec, Klangfilm and whoever else in past make the stupid double drivers configurations to get more yelps form little amps in order to sound reinforce larger areas… | ygoh wrote: | | 3.) Do you agree that with using shorter (mouth dimensions is unchanged) horn will not decrease the 'loudness' or efficiency, as efficiency does not depend on the length of the horn, but efficiency depends on throat's area and the drivers itself? |
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Efficiency depends from profile and varies slightly. Efficiency is less important factor. The important one is an equalization at a given frequency or the horn equalization diagraphs. I have no idea what it is not being used| ygoh wrote: | | 4.) Do you also agree that by shortening the horn, you loose lower frequency? Another word, the lower cut off frequency increases? |
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Sure, a longer horn means the higher ratio between mouth and throat, means more LF boost and more HF roll off.| ygoh wrote: | | 1.) What's that formula to calculate the back chamber volume given a throat reactance?
2.) Would it be a bigger back chamber with higher reactance at the throat? or vice versa? |
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You do not need any formulas. Use the guideless form this post: Practical Guide for Back Chambers Tuning.The Cat |
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