Well, Gene didn't go into great detail about the wiring that he observed, but the arrangement can be inferred from the numbers he gives. If two 12,000uF caps were wired in series(6,000uF effectively)to the positive power supply rail and two in series to the negative rail, then each rail would have 6,000uF of capacitance and this would be consistent with his point that the capacitance per channel would total 12,000uF, rather than 48,000uF.

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Enjoy the music, not the equipment.