My Klipsch ProMedia 2.1 amp is fried so I use a Dayton Audio DTA-2.1BT2 100W 2.1 to power them. I left the old amp board on the subwoofer enclosure, disconnected the subwoofer from the amp board, removed the power cord and used this hole to connect it directly to the subwoofer. Perfectly supplies bookshelf speakers and subwoofers with power. I used a room EQ master with a 2x4 mini DSP to calibrate them and now I think it sounds as good if not better than what Klipsch originally did.
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