A properly designed speaker will be 100dB down all the way out there. Speakers that are linear to 100KHz would be broiling their tweeters with noise.

Aside from laying boards out correctly, using the right parts and properly planning power, signals, commons and ground, each board inside a unit like that has to be enclosed in metal boxes that don't leak EM energy. It becomes impractical and uneconomical in the consumer market.

House of the Rising Sone
Out in the mid or far field
Dedicated mid-woofers are over-rated