I got my XPS (DR) however.........

Get a dedicated supply installed and then turn it up! 

The fuse box is in the west wing and my auditorium is the the east wing!

Do you mean, run a mains supply from the consumer unit to the outlet?

Steve GTX posted:

Do you mean, run a mains supply from the consumer unit to the outlet?

 

Hi Steve GTX...thats probably the best option....otherwise it's hire a generator 

How do I know if that is the issue? If the mains supply to the house is not "clean" running another cable won't make any difference.

It there a test I can do? 

wenger2015 posted:

Steve GTX posted:

Do you mean, run a mains supply from the consumer unit to the outlet?

 

Hi Steve GTX...thats probably the best option....otherwise it's hire a generator 

By the way congratulations on an excellent system,  I'm sure it must sound stunning 

Steve GTX posted:

How do I know if that is the issue? If the mains supply to the house is not "clean" running another cable won't make any difference.

It there a test I can do? 

Take the XPS to the "West Wing" and plug it in to the closest circuit to the fuse box that hopefully has nothing else on it (if so, try to unplug everything you can, but definitely find another circuit if there is a computer, large appliance or fluorescent lights on the circuit).  Does it hum there?

I'm having my supply split at the incoming mains tails and a dedicated consumer unit and cables run in. Will this cure the hum of a big toroidal transformer.....maybe not, but it's worth a try. Anything to stop the general household electronics from messing with the hifi supply can only be a good thing. 

Thanks, I'll give it a go but I'm really surprised that it's that sensitive - I shudder to think what's connected to the ring mains on the ground floor. Just in the living room I've the HiFi, Sky box, DVD, Apple TV, Sonos Connect, NAS Drive, TV. and I'm sure there is the odd table lamp (odd meaning more that one, not strange or an even number of them). 

What about using the IsoTek?

I would try to avoid using the IsoTek.  It sounds like you may already have several SMPS on that circuit, which is likely adding to the noise.  At the level of system you've built a dedicated circuit is really the way to go, if at all possible.

If you use the Isotek at all, I would plug everything else into it (Sky box, DVD, Apple TV, Sonos Connect, NAS Drive, TV) and definitely not the hifi.  It could help to work as a buffer.

Thank You Wenger2015

The sound is really good but your setup is not too shabby either.

SMPS?

Thank you  Mark, 

That is how I've got it now. The XPS is connected directly to the Wall socket with a Powerline, along with the 272 & 250.

I'll get the electrician around to see what my options are - I've just had a new consumer unit installed and getting a new cable to it will not be easy . 

Sorry, SMPS = switched mode power supply.  https://en.wikipedia.org/wiki/...ed-mode_power_supply

They tend to be very noisy and cause much of the grunge on your home power lines.  Often, the more of these around the house the larger an increase in performance a dedicated circuit will yield.

Steve GTX posted:

SMPS?

 

Switch Mode Power Supply.

Got them everywhere in my house!!! Can't wait to hear what the dedicated mains does for me! 

Thanks, 

With my setup - who should go on top?  

What I mean is, If they are being stacked, is there any recommended hierarchy? 

When I was running the 272/XPSDR/250DR they stacked best in that order top to bottom.  I noticed the 272 liked air above it, but really didn't notice much difference in swapping the positions of the XPS & 250.  I did notice a fairly marked improvement of having an extra empty layer of Fraim at the bottom.

The dedicated circuit did improve things for me, but my XPS (and my HCDR for my SL) still had a slight hum afterwards.  The improvement in musicality, though, was quite noticeable.

Steve GTX posted:

Thank you  Mark, 

That is how I've got it now. The XPS is connected directly to the Wall socket with a Powerline, along with the 272 & 250.

I'll get the electrician around to see what my options are - I've just had a new consumer unit installed and getting a new cable to it will not be easy . 

 

 

You don't have the 272 connected to the mains, do you?

That's how I've got mine setup . 

Hi HH, 

No it's connected to the XPS

Just to give you an idea of how essential I think the dedicated line is, I would consider installing the line prior to the XPS and a larger step than the XPS.  That isn't to belittle the XPS in any way, as I think it makes a vast improvement on the 272, but after doing it I find the dedicated circuit fundamental to the performance of my system.  I highly recommend it.

HH,

Having re read my earlier reply, I quite understand why you asked.

You do know that this is all your fault, after all, it is your plan I've been following .

A dedicated spur often improves SQ, but it will not necessarily obviate the transformer-hum of Naim power-supplies, no matter how much effort is put into removing potential suspects from one's own ring-main.

That's my experience anyway. 

John.