There was a thread in Hi-Fi forum about residential power line noise. The writer concluded from his study that low noise preamp benefit most from the audio grade fuses.
The following items were tested to see the effect on AC power by using Tektronix TDS2012 digital oscilloscope:
1. PS Audio - Soloist In-Wall Power Conditioner
2. PS Audio - xStream Premier SC power cord
3. PS Audio - Power Plant Premier
4. MDA ceramic fuse
5. Isoclean fuse
6. Littlefuse 313 fuse
7. HiFi Tuning fuse
The writer found that, both FFT measurement of the output AC power and audio listening to the music playing, fuses sounded better if they were mounted in the direction of energy flow (current).
In this post, I used some of his posted FFT diagrams to render two animated sequences then from which I come up with the followings:
1.) The audio improvement, if it was matched with the greatest changes in FFT, is mainly from the reduction of noise in the frequency range 10Hz - 200Hz. The most significant decrease in noise level is in the range 10Hz - 60Hz.
2.) Audio grade fuse do a good job in the frequency range 10Hz - 60Hz.
3.) Audio grade fuse mounted in the energy direction reduce the noise the most, followed by ceramic fuse and audio grade fuse in reverse direction.
4.) High quality power cord reduce some stray frequencies in FFT
5.) Ceramic fuse while introduce some low frequency harmonics to the power output also reduce some of the harmonics of 40Hz.
The following items were tested to see the effect on AC power by using Tektronix TDS2012 digital oscilloscope:
1. PS Audio - Soloist In-Wall Power Conditioner
2. PS Audio - xStream Premier SC power cord
3. PS Audio - Power Plant Premier
4. MDA ceramic fuse
5. Isoclean fuse
6. Littlefuse 313 fuse
7. HiFi Tuning fuse
The writer found that, both FFT measurement of the output AC power and audio listening to the music playing, fuses sounded better if they were mounted in the direction of energy flow (current).
In this post, I used some of his posted FFT diagrams to render two animated sequences then from which I come up with the followings:
1.) The audio improvement, if it was matched with the greatest changes in FFT, is mainly from the reduction of noise in the frequency range 10Hz - 200Hz. The most significant decrease in noise level is in the range 10Hz - 60Hz.
2.) Audio grade fuse do a good job in the frequency range 10Hz - 60Hz.
3.) Audio grade fuse mounted in the energy direction reduce the noise the most, followed by ceramic fuse and audio grade fuse in reverse direction.
4.) High quality power cord reduce some stray frequencies in FFT
5.) Ceramic fuse while introduce some low frequency harmonics to the power output also reduce some of the harmonics of 40Hz.
6.) I am not sure what physics explain the difference in noise by changing mounting direction.
1. PS Audio - Soloist In-Wall Power Conditioner
2. PS Audio - xStream Premier SC power cord
3. MDA ceramic fuse
4. Isoclean fuse in reverse direction
5. Isoclean fuse in forward direction
2. PS Audio - xStream Premier SC power cord
3. MDA ceramic fuse
4. Isoclean fuse in reverse direction
5. Isoclean fuse in forward direction
Re-generation
1. PS Audio - Power Plant Premier
2. Littlefuse 313 fuse
3. HiFi Tuning fuse in reverse direction
4. HiFi Tuning fuse in forward direction
2. Littlefuse 313 fuse
3. HiFi Tuning fuse in reverse direction
4. HiFi Tuning fuse in forward direction
Item description
PS Audio - Soloist In-Wall Power Conditioner
The Soloist utilizes a balanced power coupler known as a balun for filtering. A balun is a donut of powdered iron with a wire wrapped around each half of the donut. When an AC signal comes into the balun’s two wrappings of wire, the balanced power coupler design cancels out anything in common to the wires. Unlike series filters that only work on noise over a specified frequency range, a well-designed balun cancels a great deal of noise without a lot of wire in the way, thus doing so without any type of dynamic restrictions.
The Soloist’s power coupler reduces common and differential mode noise by up to 40 dB, meaning that whatever noise is on the line will be reduced by over 100 times.
xStream Premier SC power cord
Concocted from a blend of the world’s finest conductors: - PCOCC single crystal copper and solid 99.9% pure silver solid core - it’s surrounded by multiple shields and encased in a luxurious cloth outer jacket. The wire gauge of Premier is 7. 25% of the it is solid silver and the balance is PCOCC single crystal copper.
Power Plant Premier
The Premier Power Plant is the smaller of the three Power Plants in the AC regenerating line. The Premier produces up to 800 continuous watts of regulated power at an efficiency of 85% with little to distortion or noise. The Premier has ten outlets, five IsoZones™, a built in power sequencer, THD analyzer, voltage meter, MultiWave, CleanWave and a remote control to access all the features.
Hi-Fi Tuning Fuse
