[Elecraft] K3 sub rx matched filters

[jeff kb2m]

 I'm thinking of upgrading my K3 by adding a KRX3 sub receiver. One of the 
things I want to try in the near future is diversity reception. Now, I think 
I need a matched pair of filters to operate in diversity mode? Or does this 
just pertain to the 5 pole  filters?  Or, if I already have an 8 pole 1.8 
filter would I just have to buy another one ? I tried to search the archives 
and there appears to be no keyword search? Thanks in advance for any help 
with this....

73 Jeff kb2m