Need a horn expert

Yamamoto soundcraft.
The horn model nr# 350 in this case represents they're cutoff frequency. And 600hz, is they're recommended 'crossover frequency'

The F350A has a diffraction slot in the throat, different from the SS series.

Straight from they're page on the SS300/500, to shoe the principle.

for crossover frequency, SS-300 made crossover frequency of 500Hz possible to the cutoff frequency of 300Hz.

Moreover, SS-500 makes possible crossover frequency in the frequency of a low eye of 800Hz to the cutoff frequency of 500Hz.


And no, not a horn expert🙃