New listening room electrical design

I'm moving to anew house in a few weeks, and trying to figure out the electrical design.
My current room was designed by Rives and I have numerous dedicated lines in it, so, I'm somewhat familiar with the topic.
The new system proposed outline:
New dedicated subpanel, exclusively for the audio components (main located in the garage, adjacent to the new room).
I have 2 speakers (Avantgarde) with powered subs
2 separate JL Fathom subs
2 mono block amps (lamm ML2)
and number of front end component, locate on stand, that going to be on the side wall
(Preamp, crossover, TT and CD player)
I'm thinking:
Two lines with 2 duplex receptacles each to power avant-garde and JL subs
Two lines with one duplex each for Lamm mono blocks
Here is my main question:
For the preamp, crossover, TT and digital I have the following options:
1.   One line with two duplexes for the analog stuff
       Another line for digital
       3 duplex recptacles on 2 separate lines
2. One line (or two) and one power distribution box with 3-4 duplex receptacle, connected to the wall receptacle
3. Two lines hardwired (no wall receptacle and no IEC and power cord in the Power distr. box) to power distribution box, separating analog from digital receptacles inside the box

What is a better approach for the front end components?
Multiple lines feeding one duplex each,
One line feeding multiple duplexes
One line feeding power distribution box?

The audio room is in the basement?

Garage floor and audio room floor are approximately on the same elevation?

Common garage wall is unfinished concrete?

All walls and ceiling of the audio room are finished drywall?

Three walls of the audio room are concrete furred out with studs? Are you sure they are studs and not 3/4" furring strips? If studs are they 2" x 4 1/2" nominal studs or possibly 2"x 2" nominal? (1 1/2" x 1 1/2")

If they are indeed 2x4s do you know if possibly they were spaced out from the concrete walls by at least 1" or 2"? Hopefully so. You can check this by removing a wall plate from a communication wall outlet, if there is one in the room. Otherwise remove the cover plate from a duplex receptacle. Take a metal close hanger and straighten it out or cut out/off the long part of the hanger to use as a depth probe. If you are lucky the communication box may be an open back wall communication bracket. Then you can physically look inside. If not make a hole against the side of wall rough in box, side opposite the stud side the box is supported to. Push the wire through the hole made in the drywall to the concrete wall behind. Mark the front of the wire probe. Measure the length.

The first 4 points are correct
im not sure about studs or furring strips over concrete
i will find that out
I always learn something from Jea. Question: unless the construction of the drywall/studs is  already first rate, won't it be way easier to tear it out and start from scratch? 
Re Jea's comment about the proximity of the subpanel to the outlets, couldn't you locate the subpanel toward the front of the garage, to increase distance to the receptacles? (I guess that means a greater distance between the main panel/service entrance and the subpanel and I don't know what code implications there are for that).
FWIW, I used some of that mass loaded vinyl (comes in rolls and man is it heavy) in my adjacent mini-room as part of a sound proofing exercise, and I gather that it is intended to give drywall construction far more mass (apart from the soundproofing application I used it for- coupled with those acoustic blankets in my case). 
I'm enjoying your research phase vicariously, and taking notes for my own benefit.