Here's a minor error in the EX5 manual. The English and Japanese translations specify both the high and low gain as the same values. The Chinese section appears to state them as 6dB and 16dB.
I didn't find a PDF version of the manual online yet.
View attachment 140625
When my iMac Pro was in sleep mode it kept turning the EX5 back on for no apparent reason, even with the Mac's PowerNap feature disabled. I don't think this is an EX5 fault because the Mac did the same thing to the Apple USB-C DAC dongle. So I changed the EX5 auto on/off setting from A-O (auto on/off) to A-C (auto off only).