Doc wrote:
I'm making a door for a sound booth out of pine 2x4's and drywall that's
going to be about 44 1/2" wide, about 78" tall, 4 1/2" deep. The depth
includes 3 1/2" for the 2x4's and 1/2" drywall on each side.

Along with the frame of the door will be a couple of internal support
members and R-13 insulation. So, it's going to be fairly hefty. My seat of
the pants guess is it will weigh around around 80 - 100 lbs. give or take.

In selecting hinges, should a 3-pack of 3.5" hinges from Home Depot do the
job?

The hinges will be fine for a door of that weight and size as long as
they're mortised into both the door and frame.

Why do you want to use drywall for the door? I realize that you're
looking for sound deadening properties, but I don't know about the
durability of drywall on a door. What are you going to use for the
latchset?

R