...are they worth it? YES! it's a very cheap tweak that will bring the noise level down alot.
...What equipment? I used 10 ga. romex in a grounded sheathing. See my thread "Tweaks and how my system disappeared" for full detail. Aqs far as outlets, I believe the best buy (highest result for the least price) are the Hubble Hospital Grade as mentioned above. I have a PS ‘Power Port' that is better, but not all that. I just installed a Wattgate 381 and am very impressed, but the upgrade from the Hubble to the Wattgate is not equal the cost. My minimum recommendation is Hubble Hospital Grade.
...15 or 20 amp? I went with 20 amp.
...one or two better? Two is a minimum, One for the front end used with a power conditioner. (Even if you do not use a conditioner yet, you will after finding out how important noise treatment is to the power lines. It will become apparent after you install this dedicated line. The second line will be used on power amps that require large current and are effected in a negative way by most power conditioners.
Again see my thread for more information on how I tried various wire configurations and what I settled on. The grounded sheathing is a major advance and is highly recommended.
...What equipment? I used 10 ga. romex in a grounded sheathing. See my thread "Tweaks and how my system disappeared" for full detail. Aqs far as outlets, I believe the best buy (highest result for the least price) are the Hubble Hospital Grade as mentioned above. I have a PS ‘Power Port' that is better, but not all that. I just installed a Wattgate 381 and am very impressed, but the upgrade from the Hubble to the Wattgate is not equal the cost. My minimum recommendation is Hubble Hospital Grade.
...15 or 20 amp? I went with 20 amp.
...one or two better? Two is a minimum, One for the front end used with a power conditioner. (Even if you do not use a conditioner yet, you will after finding out how important noise treatment is to the power lines. It will become apparent after you install this dedicated line. The second line will be used on power amps that require large current and are effected in a negative way by most power conditioners.
Again see my thread for more information on how I tried various wire configurations and what I settled on. The grounded sheathing is a major advance and is highly recommended.