I put like 6 AAA on my XLR speaker connections and the sound became too bright and compressed. I can only deduce that doing so angers the Time-Space Continuum Gawds. I scaled back to only my AirPlulse A200 and the DAC input...
cheapest cable upgrade ever
I have recently been playing with a very cheap upgrade of signal carrying cables: Attach one or two 1.5V AAA batteries with the ‘-‘ pole in the direction of the signal’s source. Simple strapping on with electrical tape) suffices, no need to connect anything. The benefits are very audible. The weak electric field conditions the outer layer of the conductor to improve electron flow, resulting in a strong increase in transparency and dimensionality. This works particularly well on the digital cable going into the router and streamer as well as the speaker cables (on the latter ‘+’ alligns with plus and ‘-‘ with minus, i.e. two batteries per single post speaker.
At a minimum it is a low cost bit of fun