I use the term HiFi loosely, an amp from Denon Mini system which would have retailed at about £395 when new….
I use it sometimes overnight to play “lullabys”.
In the small hours, it seems louder…..
Is this because ones ears become more sensitive (background noise appears the same (nil)) or does lack of demand on the national grid at that time somehow boost the amps power (our hob seems more powerful for the same setting at different times of day).
I suppose a 3rd option could be that the bluetooth signal from my phone is stronger in the wee small hours?