it_geek
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? lost , JBL QTDUO using 3.5mm is bad ?
USB better ?
eh ... LOST
care to explain
how come USB in this case is much better than on board 3.5mm
I was rather bamboozled when you chose to plug in your JBL speakers via 3.5mm, which is an analog interface.
Even without reading through the extremely technical stuff that @wwenze posted... your instruction manual very clearly states that your speaker works via USB as an audio input too.

As others have mentioned, because your speaker uses a digital input, you should take advantage of it. A quick diagram will illustrate this (D for Digital and A for analogue)
Via 3.5mm cable
JBL TAS5760 (D) -> 3.5 mm cable (A) -> Soundcard 3.5mm port/Onboard 3.5mm sound port (A) -> Soundchip A/D Signal Processor (D) -> I/Os in your system (D)
The more analogue hops there are in the loop, the more "noise" you introduce into the transmission and the lower your quality each time you have to switch between A/D.
Via USB
JBL TAS5760 (D) -> USB Cable (D) -> I/Os in your system (D)
See how much quicker this is? Not the most accurate flowchart because I did miss out a few steps but you get the point.
This question would probably be more relevant to me since I cannot rely on a digital input... Sonos Play 5 Gen 1 user here
