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First which sub are you using? Did you properly connect both audio cables to left and right spots?
Sorry, there was a problem. Please try again later.Yes an external subwoofer should work. I recommend using the automatic speaker setup in the settings and troubleshooting from there. My experience with Denon tech support has been pleasant as well. I'm using a Klipsch powered subwoofer that has been working as it should. I assume that if your subwoofer is powered and has the standard RCA connection, it should work. Keep in mind that not all media has subwoofer output. I run into this from time to time with TV media. I hope this helps!
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