Acoustics For Musicians - Acoustic Treatments Task 4

I would like you to research the following, and post up as much information as you can to answer each of the following questions.

1 - Please describe and explain each of the following items. Please give information on what problem each item solves, why it is needed, and how it works

China Cones
Recoil Stabilizers
Auralex SonoFlat Panel
Primacoustic FullTrap
RPG Skyline
IK Multimedia ARC System 2

2 - When setting up a mixing room, please explain why the following factors are important?

Symmetry for Studio Monitor Position
Acoustic treatment placed at Mirror Points
Installing a ceiling cloud
A flat frequency response
An even Reverb time across the frequency spectrum

3 - When setting up a live room why are the following factors or features important, and how are they achieved?

A dead vocal booth
A stone tiled booth
Movable absorbent acoustic panels
A mixture of carpeted and wooden floor

Task 4

Please select three contrasting 'Studio SOS' articles from the issues of Sound On Sound Magazine in the classroom, and from each article explain how one of the issues or problems was fixed.

For each problem please answer the following:-

How was the problem identified?
What issue or difficulty was it causing?
How was it fixed?
Did it need a commercial product or is there a DIY solution?
What was the end result?