I'm replacing one of two 20-kHz, 40.455 MHz roofing filters in the first I.F. of a RA6790GM with a 10 kHz version for hopefully better dynamic range on mediumwave. Should the narrower 10 kHz filter be first in the signal path, or instead be the 2nd roofing filter in the chain for best performance? Thanks, Guy Atkins Puyallup, WA USA