While I love that Radsone included LDAC to keep up in the specs arms race, I’d argue it’s mostly a useless codec in this instance. AptX is already an almost transparent codec up to Tidal Hi-fi/FLAC standards (16bit/44.1Hz CD quality) and AAC possibly even more so as
@SubMash has been putting forward earlier in the thread. AptX HD gets bandwidth up to 24-bit streaming quality - we’re talking über-high-end formats here, with the majority of even well-recorded commercial tracks showing no appreciable difference when moving from mp3 320 to 16-bit FLAC, blind and volume-matched.
And then you have LDAC alone at the top, claiming better results but still using compression. The default mode is almost at the same bandwidth as aptX HD actually, and many report a poorer range at 990 kbps. So I’m asking: who really needs LDAC with the ES100? With the LDAC settings on the highest quality and transmitting an immaculately-recorded HD file, you'll need a sound-proofed room and at least a thousand dollars worth of highly analytical headgear to even detect, let alone derive enjoyment from the upgrade. And that’s if you even believe the material factually contains more detail depth or dynamics at 24-bit/96Hz than you could extract from FLAC; and that LDAC is substantially more lossless than aptX HD.
With that kind of expectations, it would be appropriate to move higher up the chain than the ES100 on the dac/amp side, go for the iFi xDSD or the Fiio Q5, whose Bluetooth support only extends to... non-HD aptX.
Needless to say it’s not the typical scenario I associate with streaming from the ES100. In fact aptX HD seems overkill too although it’s nice to have, with LDAC as an alternative to aptX HD for those whose source doesn’t support it, such as silly Samsung flagships.
I don’t stream formats with higher resolution than FLAC so regular aptX/AAC meets my needs. Switching codecs rapidly I don’t detect a difference, even less so in the street or at the gym where I’m losing 20 to 40 dBs of noise floor even with well-isolating iems. The ES100’s great DAC and amp section is more important to SQ than the codec used as long as it’s aptX or AAC.