[Argonaut_USERS_Group] Question on cascading filters

[NJ0IP]

I would like to improve the selectivity on my Argonaut 515.

In my 505 and my 509 (many years ago), I replaced the 4-pole crystal filter
with an 8-pole filter.

My current idea is to simply cascade a second 4-pole SSB filter with the
current 4-pole filter.  I have one in my junk box which I pulled from my
Argosy years ago.

Question:  Can I simply cascade these with coax cable or do I need to use a
buffer stage between them?  I'm not worried too much about the additional
few dB of insertion loss.

73
Rick