obsessive9119
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- Feb 25, 2024
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My ZA3 arrived today. It seems to work really well, though I'm having the trigger issue that some people have reported. After some experimentation and thinking, I'm wondering if it's manufacturing variation in how the trigger is wired up in the ZA3?
If you think about it, the trigger signal should always be sent on the T of TS/TRS - that means that it will work with either TS or TRS lead. My WiiM Pro Plus appears to send the trigger signal on T as expected. The Fosi only triggers when the plug is partially out of the socket - aligning the plug's T with the socket's R. I've tried this with TS and TRS plugs and it's the same. I'm not sure why Fosi would have used a TRS socket for the trigger to begin with (more readily available, maybe?). Being triggered on R seems like it must be a mistake.
Looking at the back of the trigger socket, I can see how it'd be an easy mistake to make:
(photo is from https://forums.stevehoffman.tv/threads/fosi-audio-za3-class-d-amplifier.1191955/page-2)
Tomorrow I'll wire up a TS to TRS lead, connecting the T of the TS to the R of the TRS. I'm pretty confident it'll work, but it'll be interesting to see for sure.
If you think about it, the trigger signal should always be sent on the T of TS/TRS - that means that it will work with either TS or TRS lead. My WiiM Pro Plus appears to send the trigger signal on T as expected. The Fosi only triggers when the plug is partially out of the socket - aligning the plug's T with the socket's R. I've tried this with TS and TRS plugs and it's the same. I'm not sure why Fosi would have used a TRS socket for the trigger to begin with (more readily available, maybe?). Being triggered on R seems like it must be a mistake.
Looking at the back of the trigger socket, I can see how it'd be an easy mistake to make:
(photo is from https://forums.stevehoffman.tv/threads/fosi-audio-za3-class-d-amplifier.1191955/page-2)
Tomorrow I'll wire up a TS to TRS lead, connecting the T of the TS to the R of the TRS. I'm pretty confident it'll work, but it'll be interesting to see for sure.