Originally Posted by bhazard
I don't understand the reasoning people are going nuts to spend more on a LPS than the DAC itself.
You can get 8 outlet power conditioners that filter dirty AC for as low as $65. It won't be as pure as 12V DC, but you'll be hard pressed to notice the difference, especially a $300+ one. Output won't be limited to 12V or USB either.
I think some people are confused as to what the power supply does. I am far from the ideal person to explain it, but I will give it a shot based on what I learned when I built a couple.
Power conditioners can filter out some noise on the AC lines, but the powers supply must still covert AC to DC that is usable by your amp. This is where the quality of the power supply comes in. In general for audio, you want as stable and as quiet a DC feed as you can get. Switch mode power supplies, by their very nature, generate noise that gets passed on to the amp. Good filtering (like what I hope the Pulse will have) can reduce the impact of this noise, but it can't get rid of it entirely. A linear power supply has the ability to deliver quieter power with less noise and fewer fluctuations. The better supplies have less measurable noise and tighter regulation on the voltage. What this means is that your amp has ideal power conditions to operate within. Constant power available for large dynamic swings, a quieter background, and sometimes better bass are the main benefits I have heard.
The main point of contention is at what point the measurable improvements are actually audible. Different power grids, different equipment, different ears, different wallets all play into whether or not something is worth it for people.
BTW, the 12VDC is the operating voltage of the Pulse. There is no option there.