Assertion: bass speaker | /r/HasProperty | exotic commodity
Facets:
value: by the mid-1990s
type: TEMPORAL
value: in 1970s
type: TEMPORAL
value: in the 1960s
type: TEMPORAL
Source sentences:
text: While in the 1960s and 1970s, deep bass speakers were once an exotic commodity owned by audiophiles, by the mid-1990s, they were much more popular and widely used, with different sizes and capabilities of sound output.