I'm new to this forum, but I do have a Fiio BTR5 and a Lotoo PAW S1 as well as Focal Stellia headphones. In reference to the prior question regarding the ES100 vs. Lotoo, I have read that the BTR5 is comparable or maybe a slight sound quality improvement vs. the E100. So hopefully my perspective will help. Vs the Lotoo, the BTR5 sounds much more bloated in the bass which tends to swamp out some of the nuance in music. The PAW S1 has a much more crystalline quality to the sound. You can notice this clearly with pop music that has a lot of bass. It also shows with orchestral music, as the BTR5 tends to gloss over some of the differences across the string sections, for instance. This is with the BTR5 connected via USB-C to my laptop. The Lotoo also works pretty well with my iphone as it passes even 192khz through with the lightning adapter I got from Lotoo. I haven't had the time yet to figure out how to use the BTR5 with an iphone, it seems dead set on connecting only via bluetooth.
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