Advice

[Pim]

Not really Pim. I am quite a sceptic in these things. So best to avoid voicing an opinion until you’ve tried yourself is my credo. Did you try to improve power delivery to and power conditioning for your Devialet? Clear to hear the difference if you try.

You're running an appliance that doesn't use anywhere near 16 Ampere in normal use. You then replace a 16 Ampere breaker, which doesn't alter the current delivery in real terms at all, for another 16 Ampere breaker and you suddenly get better current delivery? How much more current is that new breaker providing you that the old one didn't?

The first rule of snake oil sales is to 'teach' the gullible person there's something wrong with their 'cheap and nasty' standard piece of equipment. I don't know what they've told you to believe that your standard breaker is somehow a bottleneck for your current delivery but I would think it would be something like 'fast peak current when the amplifier needs it' or something like that. Every breaker in a standard installation is already built to supply short bursts of current above its standard rating to accommodate for say a bunch of fluorescent tubes or an electric motor starting up, so in the very unlikely event that your amplifier does need more than 16 Ampere of current, the standard breaker can do that. 

But don't believe me. Test it for yourself; If a circuit breaker is a bottleneck, than there should be a Voltage drop when your amplifier needs more current than it gets. So plug your amps into a power board and into one socket of a double power point and put a mutli-meter on the second socket. Crank up some bass heavy music and watch the Voltage drop (Hint; you won't)

Voltage fluctuations are part and parcel of daily life. The power supply in your amplifier is build to accommodate for that. Hell, it even works on 110Volt!

Maybe re-asses what your findings are and consider something that is scientifically proven and so powerful it can actually cure people of illnesses. Something so powerful that it gets taken into account in medical tests. It's called the placebo effect. It's also the basis for 99.9% of sake oil sales success.