Got a black DSP-A1 in good condition in trade for a tape deck. I’m currently running a Sony STR-DA3100ES for surround duty, but was wondering if the Yamaha would be an upgrade even if it’s older? I run all my sources into the 4K tv and then route DTS back via optical to the receiver for sounds. I also only employ a 5.1 setup but was intrigued by the quasi 7.1 the Yamaha has