Dedicated circuit = dedicated line?

Will installing a dedicated AC line into a music room provide any benefits over the dedicated circuit now in the room? To explain - my room has three outlets and a ceiling light shared on the same 15A breaker circuit with a hall outlet and ceiling light. Nothing else is plugged into any of the outlets except for my audio equipment. The overhead lights are always off during music listening. Does the fact that multiple outlets and junction boxes exist on the circuit in and of itself result in "degraded" AC power delivered to my audio componets? If so, could something be done at the breaker to appreciably improve the dedicated circuit quality without having to incur the expense of adding a separate AC line into the room?
In my opinion, if nothing else is drawing from the circuit breaker then you have a dedicated line. It is possible that you could benefit from two dedicated circuits depending upon the total draw of amps. ItÂ’s a good idea to have digital on a separate a circuit.
You could add a power conditioner at the breaker if you wanted to get fancy, and I'd call it a dedicated circuit as is. If your lights are incandescent you might try listening with one or more on, a constant resistive load (good old fashioned light bulb)can sometimes improve power quality by shunting noise line to line.
Turn off the the above mentioned circuit at the electrical panel. Plug a lamp or something into each of the outlets to verify they are dead.

Pull each of the receptacles out from their wall boxes. Are the wire connections made on the receptacles or are several wires connected together, inside the box, and only one black and one white wire connects to each receptacle, plus bare ground wire.

If the receptacles are used as a feed through for the wiring I would recommend having at least 2 new 20 amp dedicated branch circuits to be installed. Note dedicated not separate circuits. No shared neutrals.