a conditioner MIGHT be useful if you have a lot of noise on the line - less likely with a dedicated line but still possible
noise can be injected from your own equipment, from bad grounding (unlikely if an electrician puts in a new line), and/or from other things in between you and the sub-station, esp. things between you and the last transformer (blame your neighbors)
I would never waste money on a power conditioner unless I had measured noise levels on the line first
noise will have worse effects if your components are poorly designed
I would not worry about line noise too much until I had addressed all the major problems with SQ in the system - e.g if you have built your own listening room and spent $20k or more on the system
noise can be injected from your own equipment, from bad grounding (unlikely if an electrician puts in a new line), and/or from other things in between you and the sub-station, esp. things between you and the last transformer (blame your neighbors)
I would never waste money on a power conditioner unless I had measured noise levels on the line first
noise will have worse effects if your components are poorly designed
I would not worry about line noise too much until I had addressed all the major problems with SQ in the system - e.g if you have built your own listening room and spent $20k or more on the system