If you are talking about the depth being 40"...you may want to try turning the sofa on its side as you walk it through the opening.. standard doors are 30" to 36" wide.
A bathroom door is 2 foot door or a 2 foot 4 inch door.
i believe the door speakers are 4x6 inch and the back speakers are 6x9 inch but i am not sure.
3 or 4 inch
No
if i am not mistaken the front door speakers are 6 in a half inch and the back speakers are 6x8 inch speakers.
28 inch is all you can get in that. Any door needs a minimum of 1 1/2 more than the door size.
m6
.75 inch
a 7 inch blade
at least a 10 inch dia , saw
Typically laptops with 17 inch screens are quite weighty - they can weigh six pounds or more. If you are looking for something easier to carry, you may have to sacrifice screen size.
Four and a quarter inch