wrote:
As a demod filter? I would image a low order active filter to clean
things up. Remember, this is the audio band, not RF. I've seen some
write ups on 455khz IFs being done with active filters.

Kiwa sells an active filter for 455Khz
http://www.kiwa.com/kiwa455.html

Note the AR7030 has "tone controls", so certainly it has an active
filter past the demod. The problem with building LCR filters in the
audio band is they are bulky, not to mention often inaccurate. With
active filters, you have more flexibility over component values.

For an example of what I consider to be a very usefull filter, please
look at:
http://members.tripod.com/roymal/ReverbTone.htm

With minor component value chages, it is easy to get more or less
cut/booast and/or frequency range.

Please note that I had nothing to do with this page, I found it
usefull.

Terry