"Tim Shoppa" wrote in message
oups.com...
AM wide 12-16khz
Am narrow 6-10khz

Maybe it's my aging male ears but I've never heard an AM transmission
where a 10kHz filter was needed or even desirable. Whenever I switch
on the wider filter I just hear more hiss and static, and no more
fidelity.

In my homebrew receiver (see QRZ.COM), for SSB reception using headphones, I
toggle-switch in a modified audio response increase in the upper range of
speech frequencies, 3 dB at 3000 Hz. This greatly improves speech
intelligibility at low audio volume, and this saves my aging ears from
overload, especially when listening to weak signals. It is important to
protect hearing, at any age.

Bill W0IYH