Posted by Marc Martin on
URL: https://www.es-forum.com/Filter-comparison-II-tp1553209.html

Hi all,

Okay, here a new round of power line filter testing, with some new
additions and the elimination of filters that made no difference.

KEY
Furman = Furman PST-10D power strip
Power Sentry = Power Sentry 6-outlet power strip
Blue Circle = Blue Circle Power Line Pillow MkIII (parallel filter)
Noise Harvester = PS Audio Noise Harvester (parallel filter)
Isobar New = Tripp Lite Isobar new version
Isobar Old = Tripp Lite Isobar old version, -75db outlet
Brickwall = Brick Wall Surge Suppressor
Stetzer = reading on the Stetzer meter
Entech = reading on the Entech meter

NO VACCUUM, MEASURE NOISE AT WALL OUTLET WHEN THESE DEVICES
ARE PLUGGED INTO THE OTHER OUTLET

No filter Stetzer=190 Entech=59
Furman Stetzer=130 Entech=23
Power Sentry Stetzer=240 Entech=5
Blue Circle Stetzer= 95 Entech=2
Noise Harvester Stetzer=153 Entech=0.3
Isobar new Stetzer=200 Entech=20
Isobar old Stetzer=180 Entech=66
Brickwall Stetzer=135 Entech=55

NO VACUUM, FILTER PLUGGED INTO WALL OUTLET, MEASURE NOISE AT
FILTER OUTLET (FILTER OUTPUTS)

Furman Stetzer= 30 Entech=0.1
Power Sentry Stetzer= 80 Entech=4
Isobar new Stetzer= 40 Entech=3
Isobar old Stetzer= 54 Entech=0.1
Brickwall Stetzer=100 Entech=0.2

VACCUM ON AND PLUGGED INTO FILTER (OR PARALLEL DEVICE USED
IN ANOTHER WALL OUTLET), MEASURE NOISE AT OTHER WALL OUTLET

No filter Stetzer=1100 Entech=176
Furman Stetzer=370 Entech=20
Power Sentry Stetzer=1000 Entech=44
Blue Circle Stetzer=500 Entech=17
Noise Harvester Stetzer=700 Entech=2.5
Isobar new Stetzer=570 Entech=21
Isobar old Stetzer=1000 Entech=80
Brickwall Stetzer=570 Entech=62

VACUUM ON AND PLUGGED INTO WALL OUTLET, FILTER PLUGGED
INTO OTHER WALL OUTLET, MEASURE NOISE AT FILTER OUTLET
(FILTER OUTPUTS):

No filter Stetzer=1100 Entech=170
Furman Stetzer=400 Entech=0.6
Power Sentry Stetzer=1100 Entech=38
Isobar new Stetzer=600 Entech=5
Isobar old Stetzer=1000 Entech=2
Brickwall Stetzer=600 Entech=1

Marc