Power supply (?) induces mains noise, amplifier kills itself

[flowolf]

I have a strange problem. I used to have an SMSL A100 amplifier, but now I've come across a really cheap pair of Adam T5Vs that I wanted to test alongside my existing speakers.
So I wired everything up, and lo and behold, I had a lot of noise on one T5V. Much much louder than the normal tweeter noise of the other speaker, which is not audible from about 20cm.
Disappointed, I did a few A/B tests, during which my amplifier suddenly made strange noises and, with a few loud *pops* (directly from the Amplifier, not through the speakers) , said goodbye.
But suddenly the loud noise from the T5V had also disappeared.

The systems were not connected in any way, except that they share the same mains.

System 1:
Raspi 1 running Volumio -> dac HAT -> SMSL A100 -> Speakers


System 1:
Raspi 2 running Volumio -> dac HAT - Adam T5V

What was going on here?

Apart from that, I'm very happy with the Adams, which sound excellent with EQ.

 

[fpitas]

Sounds like your amplifier was oscillating for some reason, and eventually blew up from it.

 

[Sokel]

Sounds like your amplifier was oscillating for some reason, and eventually blew up from it.

The problem here if I understood right was not only killing itself but also injecting noise to the other,independent system before it died.

I admit it's the first time I read something like this.

 

[fpitas]

The problem here if I understood right was not only killing itself but also injecting noise to the other,independent system before it died.

I admit it's the first time I read something like this.

When a power amp oscillates, it often puts out tremendous amounts of RF. Just guessing that's what he heard.

 

[mhardy6647]

What a great headline! Talk about clickbait!
On topic , yeah, as @fpitas said, something rendering the amplifier unstable, leading to fatal oscillation, is a priori probably the most likely explanation (absent any further information on what failed in the amp).

 

[flowolf]

The problem here if I understood right was not only killing itself but also injecting noise to the other,independent system before it died.

I admit it's the first time I read something like this.

It is exactly like this! but strangely only to one of the active Speakers.

Could it be a problem that the speakers are close to each other? And that power cables are also running close by?