re: I have a Denon receiver, about a year old and

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I know you know this.

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I do. Another downfall is, if one of your speakers fails, they will all stop playing.

My best buddy and I dabbled in car audio in the late 80's - early 90's He was the first person I know that built isobaric/bandpass boxes. Wiring 2 4 or 8 speakers parallel or in series is easy to make the impedance work. 6, 10 or 12 not so much.

If I were the OP, the first thing I'd do is disconnect the speaker wires from the receiver and test the impedance of the system with a multimeter.