mecp advanced

So I was recently promoted to the senior installer spot at a local Best Buy trying to fill some really big shoes, and I'm working on getting my MECP Advanced cert by the end of next month. I took the practice test and I've got some questions that I figured I'd ask, and hopefully someone on here will be able to help me out. I've searched both this site and done some digging around google, and I'm still having some trouble finding info.

So one of the questions that I missed was regarding speaker mounting. The quesiton was wording like this;

"Which mounting condition will cause a speaker's front wave to be out of phase with the back wave resulting in destructive interference?"

the answer was an unbaffled mounting, but I can't seem to find any information on what an unbaffled mount is! Anybody care to share?

There will be more questions, I figured I'd start with this one though.

im not mecp certified nor have i ever studied for such test, but i have always conciderd the board that you make your holes on and attatch the speaker to as the *baffle board* so im guessing *unbaffled mount* would be a speaker that has no partitian between the back and front of the speaker?

First of all, those aren't questions for the Advanced MECP test.

Mu-metal is a copper, mesh-like material.  Good luck finding it.  Kinda like finding mounting brackets for an 8-track.

An Oscilloscope is a peice of electronic test equipment used in electronic testing.  99.9% of the time you'll not find one in a car audio bay.   You've probably seen them in electronic's labs for computer testing, electronic repair shops, etc.  They are used primarily in testing high frequency electronics such as cell phone sites, computer engineering and the such.  You can use them in the audio world as it will show you the actual signal on it's display.