[Elecraft] Sub-Rx Filters

[Lane]

Hi,

I have a K3 w/o a sub-receiver and continue to enjoy learning about the
hobby, and because of that, I’d like to start learning about all the things
I can do w/ a sub-receiver. So I’ve ordered the new K3S-F. Seeing as I have
several weeks to rethink my order before it ships, I’d like to better
understand the sub and filters. I also hear the sub is a pain to remove and
wanted to get my filters right initially if possible.

When I assembled my K3, I ordered the filters as FM, 2.7, 1.8, 400, and had
the last slot open. For the K3S, I have (1) FM, (2) 2.8, and (2) 400’s. So
I have the following questions.

How will the filters be installed as a factory build?

If I have a say so, would it make sense to install it as such (O = open)
Slot      1       2       3       4       5
Main    FM   2.8     O      400    O
Sub       O    2.8     O      400    O

By doing that, I leave the last slot open for 200Hz filters if they come
back, and slot 3 for something between 2.1 and above 400 if I can find a
good reason to fill them.

My understanding of diversity reception is that I can receive two different
frequencies and though used more for CW when working pile-ups, it’s not
something I’d likely use for FM, hence the single FM roofing filter. So I
was wondering about installing AM on the sub just so that I could have that
as well.

I'd be interested in knowing how you guys did it.

Thanks,