Hooking up Paradigm speakers to Denon amplifier

Make sure, if you are not bi-wiring/bi-amping them, that the jumper plates are installed. These plates connect the binding posts together for single wire installations.

Mofi has the most likely explanation. If you're not clear on what he means, just do a search under "bi-wiring" speaker connections and you'll get a lot more information. To test his reasoning, disconnect your speaker connections and move them to the bottom pair of red/black connections at the back of the speaker. After you make the switch you should only hear the two lower speakers on the tower.

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Here's a great picture and explanation on bi-wiring:

http://www.fluance.com/wiring.html