Noise and AC power.. Here is bit I wrote about a few days ago, after testing my AC wit ha noise sniffer:
Ok did all the baseline measurements. At wall,
nothing plugged in a 20amp single on a separate breaker: Noise "724"
.That line is one phase sharing common neutral with other phase 20 amp
for refrigerator. I wondered how much of a problem that ’common neutral’
made. Well almost zero!
The stereo line at wall with frig
’on’ noise "724" (frig off ’710’ frig break off noise "711" so the frig
is a non starter of a problem. VERY good to know.)
Plugging
in the two lines made up of 12 gauge MilSpec silver plated quad twist
Teflon 600V wire. grounds run between the two quads. 34 feet and 44 feet
to stereo area. From the noise readings, it is clear the quad twist all
by itself is removing a good amount of the hash from the line.
At the 34’ line end Furutech duplex (no Noise Harvesters) noise
"432" With two PS Audio Noise Harvesters in line a few feet ahead of
duplex measured at, noise "006"
The other line for the amp
at 44’ (With two Noise Harvesters in a duplex four feet from the
measured duplex) the noise level "001"(amp not plugged in. for those
tests nothing was plugged into any outlests except the Noise
Harvesters.
So outstanding noise reduction from the wall
("724") down to ("006") and ("001") on my dedicated line from the wall
to the stereo.
+++++++++++++++++++++++++++++++++++++++++++++++++ Plugging
in the PS Audio P-600 power regenerator to the 34’ line changed the
measurement at the Furutech outlet to "036" with P-600 ’on’ (nothing in
use via P-600) With TWO CD changers also ON via the P-600 the noise at
the Furutech 34’ outlet changed to "040" So I consider that wonderful
performance. None (well ,very little to me is as good as none) of the
considerable previously measured noise from the CD players is getting
BACK to the outlet via the PA Audio P-600 regenerator.
+++++++++++++++++++++++++++++++++++++++++++++++++ Adding
the Furman power conditioner OFF nothing plugged into the Furman noise
measured at the same 34’ line Duplex "063" PLUS AM radio noise on the
test instrument. (the PS Audio was also already plugged in and ON for
this test. so the Furman alone added only ((023)) on it’s own to the
noise level. When I turned ON the Furman REF 20 the noise dropped to
"035" No AM radio noise anymore. (again, this is with the PS Audio
plugged in too, so the Furman ON lowered the noise floor below what the
PS Audio added. plus the Furman ON removed the AM radio noise on the
line.)
With Furman all electronics plugged on but those
not turned on, only Furman turned on. At the 34" duplex noise measured
"042"
With all normal stereo equipment turned on the 34’
duplex measurement was noise "036" The items on included several
preamps, and the Mrantz SA-10. (not turned on two Denon DVD players, The
plasma TV. the Kuzma TT motor power supply I did not measure for
those)
++++++++++++++++++++++++++++++++++++++++++++++
Small
Adcom conditioner used for little stuff plugged in (with both big
conditioners on at the 34’ duplex noise "060" plus AM radio noise.I
removed the Adcom and substituted a Monster 5600 I own in it’s place,
The Monster on with nothing plugged in gave at 34’ duplex "045" ... With
all stuff plugged in in use (including the cable co boxes) measured at
34’ duplex "054" So I am leaving the Monster in
use.+++++++++++++++++++++++++++++++++++++++++++++++
Finally
my Audio Research SP-15 I had left plugged in at the 34’ box mainly due
to the short cord. With it plugged in at the 34’ box at the 34’ box
both conditioners in and on measured noise with Sp-15 in not ON "082"
plus AM radio noise. ARC SP-15 ON measured "081" no AM radio noise. I
removed the ARC SP-15 from that location and put back with extension
cord to Furman. I did not measure anything when I did this.
++++++++++++++++++++++++++++++++++++++++++++++++++
as
of now, my Rega turntable power supply wall wart sits with no place to
plugin. Orphaned when I decided to plug the two PS Audio Noise
Harvesters into that spot it had used...
Also I do not notice the
downside of using the additional Noise Harvesters in the 34’ line.
Previously I had them AT the two duplex on the end of the line. This
time I moved them to the single duplex at the 31’ point.on the 34'
line.. similar to the amplifier line. Why this matters??? seems to.
I have no magic comments on this stuff at this time. I just wanted to report the number
