can be done quite easily. You can take the signal after the volume control, in the attached schematic the author uses a cathode follower after the volume control of the amp, to 'isolate' the sub amp from the rest of the circuit. I believe it is a good practice.
http://www.jogis-roehrenbude.de/Leserbriefe/Klaus-PP/Push-Pull.htm
Erik
http://www.jogis-roehrenbude.de/Leserbriefe/Klaus-PP/Push-Pull.htm
Erik
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