I recently added a HK3490 two-channel receiver to my 5.1 AV system. The two tuners share a pair of front speakers and one powered sub. I am forced to set my sub settings for two channel audio (low/pass and gain settings) because my 2-channel receiver has no sub-woofer controls. Up until adding the 2 channel amp, I've had my Denon AVR control my 5.1 system and used Audyssey to calibrate. Should I to run Audyssey if my sub's LPF is set at 60 (not disabled), and the gain setting is fixed, to calibrate settings when my 5.1 system is in use?
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