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My review from amazon:
Hi! The SMSL AD18 is actually an incredibly good little amp. I have used it with predominately with Bluetooth and USB as a source. I have used it with all sorts of speakers, ranging from martin logan electrostatics and large MG-IIIa's all the way down to tiny bookshelfs. So far, it hasn't had trouble powering anything that I throw at it, with good sound as well. According to all of this, this amp would and should get a 5-star rating as it truly would deserve it outside of a very serious flaw.
I honestly do not understand exactly why this happens, but it is incredibly frustrating and is damaging my already existing equipment. The amp is primarily used through USB, set at 48 kHz (although it used to be set at 96 kHz). Not very often, but often enough, I'll be playing a game, or just listening to music and the amp will instantaneously pump out insane amounts of static to the point to where it hurts my ears. There is nothing to indicate this will happen and it is quite sudden. Anytime this has happened, the USB port it is connected to immediately dies and no longer works. As a result, I have had 4 out of the 7 ports on the back of my $350 motherboard die. This has happened with my headphones on, as well as when using speaker outputs. This is very likely to damage ears as the sound is well over 100 dB when it happens.
If I were you, I would wait until SMSL ore some rep decided to address this issue as it is not worth losing your hearing or have your equipment damaged due to a simple flaw.
Is it possible you have a crappy cable shorting out things?
No, the cable has been changed multiple times.