I'm running no center channel. Imaging is much better than with center channel IMO.
I had most of the regular door gongs and chimes coded out and only recently heard it when I popped the front hood. It wasn't loud at all. Sounded normal.
With respect to ASD delete w/o coding, you have the HK system so you can just disconnect the ASD physically without impacting the audio system at all. Or, you can buy a BMS can flap module which primarily gives you control over the exhaust valves, but also has settings that enables or turns off ASD.
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