Assertion: speaker's woofer | /r/CapableOf | operate in predictable manner
Facets:
value: up to about 2 khz
type: TEMPORAL
Source sentences:
text: Two-way designs were preferred due to the inherently simpler crossover network, but were subject to the limitations of speaker driver technology at the time – there were few high-frequency units available at the time that functioned down to 1.5 kHz, meaning that the woofer must operate in a predictable manner up to about 2 kHz.