Found this on the website's FAQ section:
Q: There are two outputs on the back. I'm confused, which one do I use to hook up to my amplifier?
A: The two outputs are labeled Normal and Direct. The Normal output should be used for amplifiers that you are not sure can protect your speakers from DC in the signal path. The Direct output can be used for all Parasound amplifiers since they include DC Servos to protect your speakers from DC in the signal path. If you are unsure, call you amplifer manufacturer or use the Normal output.
Hope it helps.
Q: There are two outputs on the back. I'm confused, which one do I use to hook up to my amplifier?
A: The two outputs are labeled Normal and Direct. The Normal output should be used for amplifiers that you are not sure can protect your speakers from DC in the signal path. The Direct output can be used for all Parasound amplifiers since they include DC Servos to protect your speakers from DC in the signal path. If you are unsure, call you amplifer manufacturer or use the Normal output.
Hope it helps.