Theory and in practice?
Audiophile speakers and professional studio quality microphones, just may be able to communicate in the 18khz to 24khz range. The roll off on professional kit in this range is, I guess between ±3dB and ±6dB, it's been years since I worked in a studio.
Your average consumer microphone and PC/laptop speakers I believe would need to communicate with each other at a volume and frequency range a human... even an old one like me, could hear.
Biting the hand that feeds IT
