By the design of the Audioengine's A/C Adapter, which is similiar to IEC's on various other electronic equipment (DVD players), the A2's short A/C cord can inserted one way or the other. By finding the correct polarity this will improve the overall sound.
This is dumb, there's no polarity with the alternating current, so putting the power cord in one way or the other is exactly the same. You are all victims of placebo.
I do not claim I understand how it works and the scientific basis of it but I have tested it with my A2s, eg. the drums from my main reference (Jazz at the Pawnshop) particularly stood out as clearer, sharper, and more dynamic. It is so obvious that it cannot be placebo.
Probably the only way they might listen to you is by emailing audioengine about it and post the reply.
We Canadians can't try this as all of our power plugs are already polarized - one blade on the plug is larger than the other and can only be plugged in one way. If polarity does not matter then why do we have polarized plugs? I'm guessing it is a safety issue?
I've had gear where hum was affected by plug polarity. That's because one lead is hot and the other neutral.
And someone answered:... It is so obvious that it cannot be placebo.
Like many things, there's a grain of truth to their wacky claim. Hum level? Maybe. "Sounstage", etc? I doubt it.
Quote from: DonP on 07 June, 2012, 08:45:29 AMI've had gear where hum was affected by plug polarity. That's because one lead is hot and the other neutral.Being pedantic, it's because your earth is imperfect,
@mzil. Again, that's because of the various possible earth sources (equipment safety, local neutral, mains earth) being at different potentials, so you can get a small AC and/or DC current flowing around the imperfect (reactive and resistive) earth circuit. Swapping the live and neutral can reduce this, but it has nothing to do with one pole being "live" and one "neutral",
He argued for weeks offering up every stoopid excuse, and in the end he called me a jerk and said that being associated with me will hurt his reputation. --Ethan
Well at begin, there's an alternate current, without any polarity. The ac adaptor convert the alternate current, into continuous current, with a polarity.