Some line conditioners can operate just fine without grounded outlets. Ideally you do want to have a dedicated grounded line but sometimes it's just not possible. I know that most monster units must have 3 prong grounded outlets, however many adcom units (ACE 515) can work without the grounded outlet.
If you consider the cost of a decent system ($2000 to $10,000?) the cost of a cable run is not so bad ($250?) or the cost of a good line conditioner/surge protector ($200 to $500).
If you consider the cost of a decent system ($2000 to $10,000?) the cost of a cable run is not so bad ($250?) or the cost of a good line conditioner/surge protector ($200 to $500).