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Uncle Peter · 20-06-2010, 23:23

Okidoki no problem, I was going to say if the drivebay box was installed it could be providing another path to ground which is not desirable. Ground loop issues aren't always characterised by hum, they can also be the source of digital noise problems like you're experiencing.

Switched mode power supplies can be bad guys too and if you're running through a PA on stage with these issues unresolved then you can forget it. On the occasions I've used my laptop and firewire audio interface live it's been with a fully balanced chain with all gear running off a power conditioner. Even then you can still detect a bit of digital hash in the noise floor when nobody is playing.

20-06-2010, 23:23	#17
Uncle Peter 81-82-83-84 Join Date: Nov 2006 Location: on holiday by mistake Age: 55 Services: Vivid 200, Full House, V6 x2 Posts: 5,977	Re: Audio interferance Okidoki no problem, I was going to say if the drivebay box was installed it could be providing another path to ground which is not desirable. Ground loop issues aren't always characterised by hum, they can also be the source of digital noise problems like you're experiencing. Switched mode power supplies can be bad guys too and if you're running through a PA on stage with these issues unresolved then you can forget it. On the occasions I've used my laptop and firewire audio interface live it's been with a fully balanced chain with all gear running off a power conditioner. Even then you can still detect a bit of digital hash in the noise floor when nobody is playing.