Using an Isolation Transformer to Reduce Line Noise
In the thread "Dedicated Outlet and Amperage - Part Deux" I asked whether installing an isolation transformer in a dedicated circuit would help eliminate noise from other household circuits.
DarqueKnight answered, "Yes."
Now, as I begin planning to install a dedicated circuit to supply power to a pair of monoblocks, I would like opinions about whether that is a reasonable idea: Would the benefits likely justify the costs?
And, if using an isolation transformer for this purpose seems reasonable, how does one determine the right specs for the transformer? At 115V, 15 amps, input each monoblock's rated power output is 750 watts into 8 ohms and 1300 watts at 4 ohms, and the maximum current output is rated at 160 amps.
My thinking so far is that I will install a dedicated 20 amps, 10 AWG Romex line from a subpanel to a receptacle for the monoblock power cords that is a close as possible to the monoblocks (to minimize the length of the power cords). I plan to use high quality outlets. I would install the outlets in an aluminum box holding the isolation transformer (like a Dreadnought box), if I use a transformer in the circuit.
Any thoughts would be greatly appreciated.
I think I figured this out.
I think I figured out how "to size" the isolation transformer for capacity to handle peak current output of the two monoblocks:
2 x (160 Amps x 120 Volts) = 2 x (19,200VA) = 38,400VA
This is one very large and heavy isolation transformer! And probably very expensive!
Is this overkill?
Does it need to be sized for peak current output?
The monoblocks are rated at 15 Amps. At 15 Amps x 120 Volts = 1,800VA, it would seem that an isolation transformer of somewhat higher than 3,600VA would be adequate.
But how much higher to give adequate head room for short "bursts" of >3,600VA load?
After research, decided to go with Silver Circle Audio 5.0
While doing my research on the various options available for cleaning up power from my mains, The Cable Company offered three used Silver Circle Audio 5.0 power conditioners at steep discounts. These are basically 5kVA toroidal isolation transformers prewired with eight audio-grade outlets.
I checked with the managing engineer at Perreaux Industries, who told me that the 5kVA transformer ought to have more than enough capacity to keep the P750 monoblocks supplied. The Cable Company technical advisor agreed and opined that it should also have enough capacity to supply my preamp and CD player, if I want to connect them as well. An Equi=Tech advisor had told me that a 3kVA transformer ought to be adequate.
Next week my electrician will install a dedicated 30 amp circuit to supply the Silver Circle Audio 5.0.
An expensive proposition. I hope it works, and I'll post results when I have some to report.
ZLTFUL; I think you are right about this
I think you are right about this.
Originally Posted by ZLTFUL
One of our neighbors built a new home with a heavy duty geothermal HVAC system and more electronics than I could ever have imagined -- probably rivals Bill Gates's set up. Sound in all rooms controllable from all rooms, security everywhere, ability to adjust temperature and observe interior from anywhere in the world, etc., etc. An absolutely amazing home theater, complete with replica of a concession stand!
He had TWO dedicated transformers installed because he needed 2200 amps of service for all the equipment in his home.
An amazing project to watch. Took about 5 years to build. Here's picture of the room in the basement where the main panels are located.