We want to "grab" the whole market

[IanG-UK]

Interesting to see these numbers appear in one place and, were it pertinent, one could do more work to look at volumes and margins and costs - which probably differ significantly across this industry as have exchange rates pre and post Brexit. But working on the basis that Apple's PBT of around 20% of sales is indicative of the industry generally regardless of size, maturity or subsector one arrives at these annual indicative PBT figures in $m:
Apple       70,000
Bose             700
B&W               30
Devialet           15
Linn                  5