Hi Gerry,
There is no need for additional filtering since the Perseus has 9 six
pole front-end bandpass filters (1.7 - 30 MHz.) plus a 3 pole low pass
for 10 kHz. - 1.7 MHz.)
I hope you don't mind my being at slightly sceptical that a low pass
filter is enough for serious LW/MW work. If one has a medium wave or
long wave broadcast stations in the vicinity, then additional filtering
will almost surely be needed.
Also it will be interesting to read how well the IMD behavior of the SW
front end filters themselves in such a small enclosure is. Small sized
toroids can, from what I know, be a weak point in a receiver with high
dynamic range.
From what I've heard radios such as the Perseus appear indeed to be
very interesting but as always, a new technology, like good wine, needs
time to mature.
vy 73 de toby
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