I can't answer the Denon question.

To find true neg / pos wires. Use a continuity tester. Take the wire from your speaker and your receiver the probe both ends until you have a complete circuit. Then label them.
I would definitely look into making sure that they are wired correctly.


M80's VP150 QS8's Earthquake SuperNova MKV-15
Integra DTR-7.4 Outlaw 755 Outlaw M200's Outlaw ICBM