Greetings,
My system (Mac Mini, V1, NAP200) gets its mains power via the standard mains leads and a Merlin Tarantula mains block. The system also shares this mains block with a TV and Apple TV. I live in the UK.
The questions I have are (bearing in mind that I am no expert in this area) those that arose from reading various threads about mains spurs and Power Lines on this forum:
Ze qwestions:
1) Are the two Naim components affected by the 'noise' from the other devices?
If so,
2) By addding Power Line(s) will this issue go away?
3) Will it go away if I add a dedicated spur/ring?
4) Need to do 2 and 3 .
5) Need to do 2 and 3 but ensure that only the Naim devices are on the dedicated spur/ring
The reason for these question(s) is that I want to ensure that I am not chasing my tail by spending money on PLs and/or a spur when there is something simpler/cheaper that could be done in the first place.
My system will always be connected to the Mac Mini so is it is affected by the relativelty noisy mains in the Mini? (I know that you can get linear power supplies for the mini but I feel it is better to spend money downstream). I have noticed that if the Mini is switched off there is a louder hum from the NAP200.
Also, I am not sure whether the mains in my house or the supply to the house is particularly 'dirty / noisy', because I do not hear pops or cracks when the lights, devices or appliances are switched on and off in the house.
I am very happy with the sound from my system. However, am open minded to sensible optimisations. The PL is easy to demo and make a decision. However, the dedicated spur whilst being cheaper is a more pervasive route with no way of knowing the outcome until done.
It would be great hear experience and opinions from those who have been in this situation and decided on one or both of the things I am considering, or did something else.
Jude 
(there is no emoji for happy but curious)
Posted on: 06 November 2013 by hungryhalibut
Ideally you would have a dedicated mains feed for the Naim units only. That will isolate the system from the rest of the house, and should give a really good improvement, it should sound more open an 'free'. The Powerline will give no such isolation.
I have my UnitiServe plugged into the spur, as it's on the end of a linear power supply, so there are no nasties from the switch mode supply. The linear supply made a really good difference, and one may or may not do anything for the apple.
Once you get the spur, you can think about Powerlines.
If you do the spur, get a dedicated consumer unit at the same time and run a single unbroken 10mm2 cable to an unswitched mains socket of high quality.
Posted on: 06 November 2013 by pslosarc
Absolutely agree with all that. Dedicated Consumer Unit, 10mm cabling, switchless sockets, then Powerlines. I have just added a Powerline to the Hicap powering my Headline/HD800's and the improvement is huge, so much more texture to the music. Dedicated spurs are probably the most cost effective upgrade you can do, and should be a prerequisite. I swear by a cable run for each black box, but I know opinions differ on that score.
Posted on: 06 November 2013 by hungryhalibut
In that situation you would run say four, six or eight cables from the dedicated consumer unit, each terminating in its own unswitched socket.
I was advised that a single cable gave a more integrated sound. But in the age of Powerlines multiple feeds could very well be better, as it avoids the need for distribution blocks or a hydra.
Posted on: 07 November 2013 by joerand
Originally Posted by Hungryhalibut:
In that situation you would run say four, six or eight cables from the dedicated consumer unit, each terminating in its own unswitched socket.
I was advised that a single cable gave a more integrated sound. But in the age of Powerlines multiple feeds could very well be better, as it avoids the need for distribution blocks or a hydra.
As you indicate HH, there would, presumably, be drawbacks to running that many wires in close proximity to one another. Cost, logistics, and potential electromagnetic interference between the circuits, possibly others? I plan to run one dedicated circuit terminating in a single two-socket outlet to feed my system from a distribution block (currently a CablePro NANA). I would then use the existing outlet for the TTPSU on my RP6. This leaves room to later upgrade the distribution block and possibly the outlet (although I'm considering the Oyaide R1).
Posted on: 07 November 2013 by hungryhalibut
Nowadays I only have two things to plug in, so the double socket is perfect. Previously, when I had lots of boxes, I used a Graham's Hydra, which was, and still is, a very elegant solution.
Posted on: 12 November 2013 by Jude2012
Thanks for the insights, folks.
Have considered this with a chat with an electrician and although the cabling work is cheaper, probably with the 'making good' the cost would be on a par with one PL. However, the disruption is not something I want now.
So, it's demoing a PL for me on the Naim units.
Jude
Posted on: 12 November 2013 by The Meerkat
Hi
I will soon be doing what you guys have done, running a separate circuit, but I thought that mains wiring to sockets was 2.5mm twin and earth, leaving the 10mm for electric showers. (UK wiring) Or have I got the wrong end of the stick here? I'm doing it to try and reduce the terrible hum on my HiCap DR.
