Hi & many thanks to everyone who responded.

Bill - I'll work through your excellent detailed instructions at this stage & wait & see what outcome I achieve.

Fred - I'll also be trying your suggestion.

Cees - My present set up is :-
1. KN7 - Main L & R outputs > P/Mixer Stereo Ch. 1
2. KN7 - Sub outputs 1 & 2 > P/Mixer Mono Ch. 3 & 4
Sub outputs carry Drums 1 & 2 in stereo
& panned accordingly.
3. Powered Mixer - Mono out from mixer > input of a separate power amp. for sub bass.

4. Powered Mixer > Speakers A & B - Main Mix (Keyboards & Vocals)

5. Power Amp > Speakers C & D - KN7 Sub Bass.

6. Drums can be EQd.separately with mixer when needed, depending on style being used within reason.

John C - Have noted your suggestion. another option.

John - Banks of Panel Memories are "so" important for dance musicians.

Many thanks to you all for your helpful advice with which I will work through & hopefully achieve a positive outcome.

Yours in Music,
Alan