I removed the grill and felt and decided to listen. It sounded slightly thinner, brighter and more open but with less bass control and impact.
I will try to one ply with felt and grill to see how they sound.
I know it's counter-intuitive but I'm guessing adding the toilet paper is like putting cotton in the Fostex T50RP, it will make it sound more airy and brighter?
Edited by sling5s - 12/30/13 at 12:58pm