The bandwidth of POTS is limited to about one decade, from 300 Hz to 3.3 kHz. Often you don't notice the poor quality while using POTS. But if you ever listen

The bandwidth of POTS is limited to about one decade, from 300 Hz to 3.3 kHz. Often you don't notice the poor quality while using POTS. But if you ever listen to an NPR show where a journalist is calling into the studio over POTS, it's quite jarring how bad it is.