Wish a speedy recovery bro!Well I may not be the right person to give a performance review as 50-55db is very low and u miss a ton of details and also I am sure none here are going to watch something at that level. I won’t be also testing a lot like before and aiming perfection. Just run audysey and use at low volume levels occasionally. I won’t be using my HT like before.
Most of the time I watch movies at a Master volume level of -35 to -30 dB , rarely go down to -25 to-20dB which is very loud to me. Not a technical guy so don't know about volume percentage.