Glad to hear the firmware update went so well. Equally glad to hear that the upgrade has given you renewed enjoyment and possibilities with your 990. I’m still processing through a 950 but thought I might offer you another option to try in your arsenal of playback options. You mentioned an Oppo player in you setup. Oppo has a great feature of spreading a stereo source material through the other channels when you have “Downmix” set to 7.1 or 5.1. It is not a 100% L/R duplicated in the SR/SL but a very nice sound distribution. If you have your Oppo setup with analog outputs (typically for SACD/DVD-A) and use you 990 “7.1 Direct” mode, you’ll get a very good stereo feed that utilizes more of your systems speakers. You might try it to see how that sounds for you. The firmware update should also now provide just the right Outlaw Bass Management.
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Marantz AV7702mkII, Outlaw 7220, ,7ea-Outlaw LCR (2ea.- L/2ea.- R/C/SR/SL),Outlaw 7125 for 4ea-Outlaw LCRv2 (Atmos ceiling),Outlaw Ultra-X12 & LFM-1EX Subwoofers,BR/DVD Oppo BDP-103,BDP-83SE, Samsung 65" OLCD, Sofabato remote - Whole house audio via two (2ea) 7125s.