Yes, I use a 9v battery on the downstream Media Converter with a similar adapter. Standard 9v batteries donât last too long⌠There are 800 mAh rechargeable ones available that last much longer, as well as something like this:
I havenât tried such a âbattery supplyâ yet as I am waiting until the EtherRegen comes out and will probably try that next, though it is much more expensive (~$600).
Sound quality wise there was an immediate noticeable improvement (meaning no A/B required) when the Media Converters were installed, and a second easily noticeable improvement when the battery was substituted on the downstream supply. I admittedly have a very dirty network (i.e. lots of activity, switches, conversions, and power supplies).
Specifically, the background was blacker with more micro reverberations around the instruments which also seemed more individually delineated. This was most expressed on vocals which were strikingly more life like with the kind of near field reflections that make them believably present. Transients, both bass and HF were better defined.