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Answer:
That is for certified technicians to use if you take it in for service.
From the manual: Do not make any connections to this port. It is reserved for use by authorized service personnel in the event that a software update becomes available.
source: http://www.harmankardon.com/images/media/HK3390_OM_EN.pdf

By Kronz on November 17, 2013
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Ross, I run a set of JBL ND310's and the amp has no issues what so ever making them "Sing" I believe this will also be the case for the Klipsch Forte's If your worried about it just step up to the Harman Kardon HK 3490 120 Watt Stereo Receiver. A few extra watts, same quality. I love my receiver. I replaced a Carver CT… see more Ross, I run a set of JBL ND310's and the amp has no issues what so ever making them "Sing" I believe this will also be the case for the Klipsch Forte's If your worried about it just step up to the Harman Kardon HK 3490 120 Watt Stereo Receiver. A few extra watts, same quality. I love my receiver. I replaced a Carver CT-17 & power amp. Happy I did. see less Ross, I run a set of JBL ND310's and the amp has no issues what so ever making them "Sing" I believe this will also be the case for the Klipsch Forte's If your worried about it just step up to the Harman Kardon HK 3490 120 Watt Stereo Receiver. A few extra watts, same quality. I love my receiver. I replaced a Carver CT-17 & power amp. Happy I did.
By Scott Sutton on January 2, 2013
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yes go through pre amp inputs
By joe mulvaney jr on January 27, 2014
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Yes, the controls stay firm. I have kept the bass "high" and treble "low" since I purchased the receiver, which sounds best to me with my Bose speakers. The receiver quality is as good as the day I bought it & it is on every day, i.e. radio, CD, DVD & TV - a super value for the money.
By Susannah Danna on November 17, 2013
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you have optional choices to switch outputs i.e. speaker 1 or 2 or both. Analogue, Digital output, there is an output on the front of the appliance for headphones also.
I hope this answers your question

By Trevor Silkstone on January 13, 2014
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I haven't actually used the tuner. I have four vintage Norman Lab floor speakers and a new Polk subwoofer attached. The amp is powering them just fine although you will need some high end/heavy duty speaker wire if the speakers are very far from the amp.
By L. Stephen Kovash on March 4, 2014
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You can only listen to one source at a time. It will work with a turntable or a TV source but you have to choose which to listen to with the remote or buttons on the front.
By Michael Murphy on January 19, 2014
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Yes. Worked for me.
By Don Alan Hall on October 26, 2013
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Yes it does. Ref p. 17 of owners manuel http://www.harmankardon.com/images/media/HK3390_OM_EN.pdf
By Steve Andersen on December 27, 2013