****so most likely not something that the speaker would play a role in producing assuming the speaker does in fact deliver the real instrument fundamental frequencies up to snuff.****
Some modern composers have exploited these difference tones in their music, and the tones are audible to the listener (audience). When I was in music conservatory we performed an experiment to find out if the remarkably loud difference tones produced by certain combinations of fundamentals heard in the performance of Eugene Bozza flute trios were captured by a recording, and they most certainly were. So I think while some of these effects may occur in the recesses of our hearing mechanisms only, undertones, in the usual sense, can most definitely be captured by the recording process, and hence need to be reproduced by speakers if the complete timbre of instruments is to be reproduced.
The cool thing about all this is that there is so much to this stuff that is still not fully understood.
Some modern composers have exploited these difference tones in their music, and the tones are audible to the listener (audience). When I was in music conservatory we performed an experiment to find out if the remarkably loud difference tones produced by certain combinations of fundamentals heard in the performance of Eugene Bozza flute trios were captured by a recording, and they most certainly were. So I think while some of these effects may occur in the recesses of our hearing mechanisms only, undertones, in the usual sense, can most definitely be captured by the recording process, and hence need to be reproduced by speakers if the complete timbre of instruments is to be reproduced.
The cool thing about all this is that there is so much to this stuff that is still not fully understood.