Not only is this completely correct, but well documented over the years.
There will always be people who "poo poo" such things, or claim they can hear what dogs and Eric Johnson cannot, but grill cloth will change the sound of a cab.
it looks awesome and I have to agree, that is the sexiest 2x12 cab I've ever seen....but where did you find the badge ?
Where did you find that cloth? It looks really good!! I really like it.
The History of Marshall has the information on grille cloth changes.