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Kenwood KA-801 - Premp output

Does anybody know how to get the preamp output from this integrated amp in order to add a subwoofer ?
I tried following the diagram I downloaded from this web but failed in finding out where the preamp ends and the amp biggins...
I also tried using the Tape B DIN socket but the output is so low that it barely works.
Useful feed-back on above will be highly appreciated.



KA-801 PRE-AMP OUT FOR SUBWOOFER

I HAVE AN 801...THE ONLY WAY I THINK YOU COULD DO THIS IS TO GO FROM THE SPEAKER OUTS TO THE SUBS SPEAKER INPUT, THEN SUBS SPEAKER OUTPUTS TO SPEAKERS...THE SUB WOULD SLAVE OFF THE SPEAKER INPUTS...IF YOUR SUB ONLY HAS A SINGLE OR DOUBLE RCA FOR THE SUB FEED YOU MIGHT NOT BE ABLE TO RUN A SUB...MIGHT ALSO BE ABLE TO GET A AUDIO CONTROL AMP LIKE A YAMAHA AVC-50 WHICH I BELIEVE CAN BE CONNECTED TO THE TAPE MONITOR OUTPUTS OF THE 801...THEN USE THE TAPE MONITOR SELECTION ALL THE WAY TO THE LEFT POSITION...THE 801 DOES NOT HAVE PRE-IN MAIN-OUT CONNECTIONS...