I had a JBL SDP 55 with the 58 upgrades and all services performed on it.
Dante is the digital output system, and it's broken on the JBL units: there are pops from the unit when you have Avio adaptors plugged in to get digital output.
Tested with multiple dongles, multiple network switches, and multiple Genelec speakers.
I performed all troubleshooting steps that Harman support presented to me, but then found out there was a firmware issue they knew about and hadn't been able to fix for over a year.
"Good morning
It's IMS0024523 -- it has indeed been reproduced. The DSP engineers work on the Dante side of things, too, but if there are any DSP updates, it'll be to resolve that, if they're able to do so."
This was from September of last year. Just sold it a month ago to someone using the XLR outputs, but the JBL SDP 55 is broken with Dante and it's not resolvable with the Dante adaptors to get AES/EBU from Genelecs.
Other people say they aren't experiencing this with Dante enabled amps, and maybe that's true, but I'm not sure what solution one would use for 8 channels of Dante to AES for a reasonable price.
I'm now using a Monoprice HTP1... Which is also likely busted as biased/auto/etc switching on the inputs doesn't resolve the intermittent silence issue from an Nvidia Shield or Nintendo Switch.
Sometimes I miss my $200 Dolby DP564. It could only decode Dolby formats, but had digital+analog output and didn't have the issues like these other units costing 20x as much.
Doesn't matter if the SDP 55 or the HTP1 support ART, which I really hope for, if they have issues like this.
Just wish Genelec would make a surround decoder that actually worked, as my next option will likely be WiSA dongles for everything.