Would it be a good idea to use a regular off the shelf SMPS used for LED lights with some added filtering for an audio amplifier or would that be too noisy without the added help of a linear regulator? I can't get a hold of any power transformers that would be affordable for me and I know that supplies such as PC power supplies are too noisy without a lot of added filtering from experience but before I dive into the idea is there anything else I need to know about cheap Chinese SMPS' used for LED lights?