[Elecraft] [K3] Subreceiver - any use for AM, FM?

[Mike Markowski]

Yet another filter question...

My k3's main receiver (only rcvr just now!) has filters for FM, AM, 2.8
kHz, and 400 Hz.  I occasionally enjoy SWL and also have the general
coverage option.

I'm considering a subreceiver but am not sure there's a need for more
than duplicating the 2.8 kHz and 400 Hz filters: 2.8 kHz for tracking a
dx station's listening habits, and 2.8 kHz & 400 Hz for diversity
receive.  I can't think of a need for AM and FM on the sub.  Or am I
overlooking some useful applications of them?

Thanks and 73,
Mike ab3ap