There are no speakers currently manufactured that " need " subs. If a person wants to add a little more foundation to the music they may choose to add a sub or two or one might suppose a swarm of subs.
Small or large sub for music
I've been using a pair of Velodyne HGS-10s to supplement KEF LS50s below 50 Hz, but I read that larger subs are better for music because the cone needs excursion. Is there any truth to this? I have a pair of HGS-15s that I could use to supplement the LS50s or Reference 1s (below 40 Hz) if I go there. The HGS-15s do HT superbly.
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