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James Price wrote:



In your experience, would a guitar speaker (not bass guitar speaker) be
capable of producing low frequencies around 40 Hz at any output?


** Of course, but not at the high sound pressures available at higher frequencies. I often test combo amplifiers by applying a 40Hz sine wave to the input to reveal the existence or otherwise of buzzing and rattling noises from the speakers and cabinetry. Some clean sound at 40 Hz is audible at close range but not very loud.



I
ask because I was privy to a discussion where it was claimed that 1) they
don't have the excursion needed to produce frequencies that low and 2) the
wavelength comes into play; speaker excursion can't deal with waveforms
that long.


** Both claims are false.


There was also mention of guitar speaker cabinets being designed
for mid-bass on up to around 5 kHz, the implication being that they likewise
aren't designed or capable of reproducing frequencies that low.



** Guitar speaker cabinets are mostly open backed, imposing a strict low frequency limit depending on the dimensions. The larger examples reproduce well down to about 60Hz.

Closed backed cabinets may do better or worse, depending on the actual drivers in use and the existence or not of porting.

It is true that guitar speakers have limited cone excursions ( compared to hi-fi woofers), but this is made upfor by having large cones areas and the use of multiple drivers in cabinets.



..... Phil