Measuring line noise and power conditioners

Conventional filters will do little in actual power lines or may even amplify EMI - it is in their own specification (that is, for those manufacturers who bother to publish such specification).  For a brief explanation please see this link:  https://www.onfilter.com/real-life-filtering    In short, regular filters are designed to perform at 50 Ohms termination (in and out) for EMC Compliance - CE and FCC.  I personally haven't met a power line with 50 Ohms impedance.  In real-life applications a better impedance ratio is 1/100 or 0.1/100 (not a critical difference in reality) where 1 or 0.1 is output impedance of AC power and 100 is rough number for a load, i.e. your amplifier.  It is imprecise but much more realistic than 50/50 Ohms. Since a filter is a combination of inductors and capacitors, when designed with one goal in mind to work in a 50/50 Ohms environment, this is where it "tuned" to.  In actual use it either does nothing or amplifies noise.  Our company (tooting my own horn here) designed filters for actual installations that we provide to the factories around the world, NASA, governments, hospitals, etc. - they are impedance-independent and essentially kill emissions anywhere they are plugged in -  https://www.onfilter.com/ac-power-line-emi-filters

OK.  BLATANT ADMISSION.  I am the manufacturer of the UberBUSS power conditioner.  This being said here is the experience of one of my clients:  Thread is on Audio Nervosa-

Check the new UberBuss with my Entech Wideband AC Noise Analyzer.

Calibraded the meter for a noise level reading of 100 on an AC outlet without the UberBuss plugged.

Plugged the UberBuss into the outlet and the noise level dropped to 50, plugged meter into the NCF outlet on the UberBuss and it dropped to .3.

Guess it works. 

Power conditioners are all snake oil and are NOT needed. The only useful purpose they may serve is for dangerous voltage protection like lightnings and such.

All amplifiers work with DC. Mains AC is converted to DC inside all amplifiers thru transformers, rectifiers, hi freq filters and smoothing capacitors. Lower wattage power amps may also have voltage regulators, which is even better. Because of this, the quality of the mains AC has virtually NO effect on the sound (the DC) if the amplifier is properly grounded and there are no ground loops. If the rectifier and smoothers are of good quality (which in most cases these days are), and proper spike filtering is also done (again, which in most cases these days are), and as long as the waverform you feed into the transformer from the mains resembles ANY kind of rough sine wave (which will be the case even in the noisiest mains supplies), everything will be fine. You may run LESS EFFICIENTLY since the transformer will not establish a proper magnetic field but the rectifiers & smoothers will take care of everything.

ALL the necessary design to make the DC as smooth as possible are ALL included in the amp itself. Noise reduction, PSSR, smoothing, ripple reduction and transient current capability are ALL included in the power supply of the amp itself. Especially with good quality amps, this is almost always a given (Like Pass Labs).

Where you need a good quality clean AC is if you are using AC motors, like synchronous and induction. These may be driving your turntable and their rotational stability and "jerkiness" is directly affected by the quality of the AC. Even then, most turntables these days internally synthesize their own AC thru precision electronics if they are using an AC motor (one of the earliest example of this is the Linn Sondek LP12 Valhalla).

Therefore, power conditioners are a complete waste of money for amplifiers.

cakyol

Your statements fly in the face of long settled science.

Dude, google is your friend. Look it up: EMI ; RFI ; broadcast radiation.  Halfwave rectifiers.  Cell phones.......


Why does every research lab doing milspec research utilize power filtration: LASL; Sandia Labs; Lawrence/Livermore; KAFB; MIT; Stanford; NASA; DARPA; Fermi Institute; VVA; every semiconductor manufacturer on the face of the earth and on and on and on and...

You are just wrong. You are simply clueless.  Do some homework.  Try something.