The L/R and surround speakers are 3 ohm, the center 6 ohm. A bit on the low side, except for the center, but would probably work okay, but could have issues at high volume levels. The subwoofer is a passive type (also 6 ohm) and your Denon is intended to use active subwoofers (passive means a separate amp is needed, active is where the amp either is built in or dedicated to the subwoofer)....your Denon does not have an amplified sub channel, just a pre-out (pre-amplification output). This isn't unusual for HTIB sets like your Panasonic, to not work with standard components, being somewhat a closed system.