Sony STR-DA2800ES Operating Instructions Manual page 74

Note
You can connect the HDMI ZONE 2 OUT jack directly to a TV in zone 2 (without any amplifier/receiver). It
is recommended, however, that you connect a TV via an amplifier/receiver for higher audio/video capabilities,
reducing possible effects on the main zone. When you select the same HDMI input for both the main zone and
zone 2, the audio/video capabilities in the main zone will be limited in accordance with those in zone 2.
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