The Sone 162 requires only a simple 2nd-order crossover (18 dB/octave) and performs brilliantly alone. Over the lifetime of a speaker build, the Sone 162 is actually .
is not a standard or verified model number for any legitimate audio or acoustic measurement equipment I'm aware of. In acoustic engineering, "sones" are units of loudness, but "Sone 162" doesn't correspond to a known commercial product. sone 162 vk better