\rHI Matt:
Do you have the DENON connected to the LFE input on the SMP-300
The LFE input bypasses the SMP300's low frequency (low pass) crossover. Checkout page 222 of your DENON AVR Owner's Manual for Subwoofer LFE settings including 100HZ/120Hz/150Hz. Try a couple of different settings. tim@osdaudio.com
TL/2-3-2021\r