Old telephones audio bandwidth was a limit dictated by technical reason, what I mean is that, since the "target" bandwidth of all audio systems is the classic 20Hz-20KHz, cutting an instrument like a piano (which covers most of that spectrum, with its harmonics) at 1.8KHz with an LP24 filter like the one in NS4 Amp/Eq to me sounds a little strange.lawman wrote:And maxpiano, all I can say is that the LPF does in fact make a big improvement, at least to me. Plus, I've read that the frequency response of those old telephones peaked at around 1 kHz.
Then if you are happy with that, all fine.
