Maybe all that empty space is where Sherwood put their amps in their R-965. I imagine the 990 and the Sherwoods (R-965 and P-965) use the same chassis.
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AvFan
Outlaw 976 | ATI 2005 | M&K 850s Left, Center & Right, Surround-55s, MX-70B Sub | Harmony 950 remote | Panamax 5100 | OPPO UDP-203 | LG OLED55B7