The soundproof door

I am so tempted to get the soundproof door made by Sound Isolation Store.  It sounds well thought out. Except, my plan has been to disable or remove the bottom door sweep to make it open and eliminate the need for an air return for the room, which would be expensive and also difficult because there may be little or no room left in the ceiling almost everywhere for a return.  Yes I know that would ruin their STC rating, but it's still a solid and quiet and well made door, and the door bottom could always be stuffed when needed.  It would be worth that to me if I still had money to burn.  Unfortunately, I've already burned through well more than $10,000 this year on home improvements, with bigger improvements yet to be done.

So I've been looking at other options.  Big national doormakers Masonite and Jeld-Wen both make a solid core door claimed to block noise.  By most reports the problem is not with their actual solid core door products, which are fine, and excellent value for the money.  The problem is that they may just use standard jambs and such.  The standard jambs and hardware lose much of the potential of these doors, which could meet STC 45 or thereabouts with good jambs, seals, and hardware.

Here is a great post that suggests various parts for building a sound blocking door.  The author mentions that major door makers all can make a 5 ply solid core flat door blank with STC of 45.  Then get a flat metal jamb (no stop) or solid birch single rabbit.