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  1. Funny, the physical laws of reflection, refraction, scattering, diffraction, etc, are similar for sound waves and light waves, but the resemblance does not stop there. Listening to various car loudspeakers, I found the minimal diameter for an acceptable sound is 70mm, and that's also the smallest diameter for a satisfactory telescope in my view. 80mm grant a little more resolution in both, and 80mm is a very popular diameter in compact scopes or compact radios, at least the older ones. They make 90mm scopes to get some extra oomph, and the 90mm loudspeaker begins to issue more discernible bass, so much so I keep one from an old radio my father bought in the 70's, not knowing what I'll do with it but the bass, checked that when plugged to a guitar amp, is noticeable enough despite the size. Then the standard louspeaker size in non-toy stereos is 100mm, and the standard refractor size to get good resolution and power is also 100mm. There must be a reason if so many observers buy that many expensive 4-inch apos, but not nearly as many buy tighter apertures for comparable sums. Following the same progression, monitors in studios have 125mm to 130mm loudspeakers (that need to be complemented by a tweeter because the similarity cannot be total between light and sound), and these diameters are also the ones that provide deeper resolution on planets. 150mm approaches real power in telescopes, and 150mm is also the entry-level size for a guitar amp, like my 15 watt Fender Frontman, which does not lack bass despite its handbag format (WonderWoman's kinda big and heavy handbag). 200mm is quite enough for most observers, resolution-wise and power-wise, which happens to match the size of more serious amps. I have a modded Stagg 20w 200mm guitar amp and an Ampeg 20w 200mm bass amp, both are plenty large enough to deliver a full sound in their range. There is a reason if so many 8-inch Schmidt-Cassegrains and newtonians are in use everywhere! Then the 10-inch scopes are heavier, but not unbearably so, and the 10-inch loudspeakers also deliver the near-maximal power and resolution for an amp that remains not hard to carry around. 12-inch scopes deliver enough light and detail to satisfy most everyone; again, the equivalent 12-inch size amps give out enough frequency range and raw power to please the vast majority of players. Size and weight become an issue in both cases, but not enormously so. And lastly, the ultra-large 15" amps or 15" to 16" scopes start another league in power and resolution but they both become equally difficult to transport. Not quite apples and oranges in my opinion, does it seem like a coincidence to you?
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