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  »  New  Another example of energy..  System Warm up...  Audio Discussions  Forum     1910  9534619  01-29-2011
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02-21-2023 Post does not mapped to Knowledge Tree
Amir
Iran Tehran
Posts 300
Joined on 02-11-2009

Post #: 1901
Post ID: 27066
Reply to: 27065
AC shared between 200 apartments
If I am working on AC quality because the AC quality in the big building is very very bad.My apartment is in a big complex shared between 200 apartments + 7 big elevator and ...This Building has three phase AC power , in most homes the AC is better between 2AM to 5AM but in my home the dc offset increase after 2AM. It is very awful .
I do not disagree with you but I had many amplifiers in my room , more than 10 different amplifiers (kondo 300b, Audiopax ...)Even Pure Power can not help when AC quality is bad. You know Audiopax designer was very smart designer .
About grounding:Yes, Earth wire will decrease RF but I think RF is not the main problem.
I hope you let me know which amplifier is less sensitive to AC ?



There are different aspect of bad AC quality :- sometimes the sound is very forward and compress , rough and aggressive , reminds me bad/noisy computer playback- sometimes the sound change less than 10min , it is quality is variable - sometimes the sound lost liveness/accuracy and get creamy/soft. This softness is un-natural and it reminds me high jitter dac playback- sometimes the sound lost transparency and is opaque- sometimes the sound loose weight and bass- sometimes the sound loose midrange emotion/tone/harmonics- sometimes the sound is pure harshness


02-22-2023 Post does not mapped to Knowledge Tree
Paul S
San Diego, California, USA
Posts 2,583
Joined on 10-12-2006

Post #: 1902
Post ID: 27067
Reply to: 27066
Noisey Ground
Of course apartments are among worst cases in terms of noise on the ground. I understand and sympathize that there are situations where it is either impossible or extremely difficult to install bleeder ground rods and wires. In any case, there is always a delicate balance between main/neutral and safety/bleeder grounds, because impedance to ground is typically variable, and at any given time there might might be anything from RFI to EMF on any given wire in any given installation. Basically, the problem itself is dynamic rather than static, whch means any fixed "solution" might even add to problems at a given time. While specific electrical situations require specific electrical solutions, a hi-fi system is a moving target. Again the apparent efficacy of the PP got me thnking long ago that it ameliroates a wider-than-usual range of sonic problems rather than "correcting" electrical problems.



Best regards,
Paul S
02-22-2023 Post does not mapped to Knowledge Tree
Amir
Iran Tehran
Posts 300
Joined on 02-11-2009

Post #: 1903
Post ID: 27068
Reply to: 27067
AC is like big giant
Paul
I have listened to some friends systems in their home from morning to night and the AC quality was also variable accross the time but overally my AC quality was worse in comparison by my friends home.
In Iran the new year holiday is 21 March - 2 April and believe it or not I only have good sound in New year holidays (12 days) .
I have tested many solutions but this Market is full of useless expensive solutions like AC cables, Ground controls , AC filter , Regenerators , RF eliminator and ... I have paid for many of them but non of those products worked for me.Between all of them only the pure power is good and I love it.

I feel fighting with Electricity is like fighting with big giant, it is impossible to win.
02-25-2023 Post does not mapped to Knowledge Tree
Amir
Iran Tehran
Posts 300
Joined on 02-11-2009

Post #: 1904
Post ID: 27069
Reply to: 27068
DPOLS vs Good AC Power
After more than 20 years of playing audio game I think only two things are real game changers.  
DPOLS and Good AC quality
I do not claim I listened to Wilson Speaker in DPOLS but I am sure it was near DPOLS 14 years ago.  I remember for the first time I found this forum GSC for DPOLS experience in 2009. After that night I never had DPOLS experience in my life. It was a shocking experience.

I think good AC quality could lower the noise and improve harmonics/tone in all frequencies. believe or not super good AC quality can change a low feedback low stage high power solidstate tone more close to a low power low feedback SET. please do not blame me for the BS comment , I had an experience only one time in my life for less than 15minutes when the AC Quality was very very good. that night the sound (especially tone/harmonics) of my high power solidstate amplifier was 1000% better than normal AC quality. I had a feeling of god tone (like red glow of molten iron), It fills the room with emotion of music and I will never forget this experience and if DPOLS unlock all dynamic/Image/tone then Good AC quality could unlock tone/harmonics.
I know most solidstate amplifiers are dead sounding machines but few of them are good and AC quality can change their sound by wide margin.God is in the AC quality :-)))
03-03-2023 Post does not mapped to Knowledge Tree
DHT4ME
Las Vegas NV
Posts 18
Joined on 08-27-2008

Post #: 1905
Post ID: 27070
Reply to: 27069
DC issues with early AM power
Amir,
Taking note that the DC condition is present when you say the power is cleanest yet Pure Power does not help leads one to want to investigate a high current DC blocker BEFORE the PP. Its possible that heavy DC could effect the PP in some way. Most DC blockers only work to block a few millivolts up to just under 1V of DC . How high is the DC on your line in the early AM?


Robert

www.Robert-Park.com
03-04-2023 Post does not mapped to Knowledge Tree
Amir
Iran Tehran
Posts 300
Joined on 02-11-2009

Post #: 1906
Post ID: 27071
Reply to: 27070
I can not measure DC
When I use Pure Power then I hear no noise/buzz from Big transformers of Power amplifier.It seemd Pure Power 3000 blocks DC .I have no device for measuring DC voltage of AC line.I did not use any DC blocker before Pure Power and I have no idea about it but I doubt DC blocker could help without adding negative effect on the sound.I have used Isolasion transformer before Pure Power and You know Isolation transformer can block DC but isolation transformer does not help and degrades the sound.All AC power devices I have tried were not good for sound.
This is my conclusion :If you have low power system go for : AC panel -> Good AC Cable -> Pure Power 3000 -> Audio SystemIf you have high power system go for : AC panel -> Good AC Cable -> Audio System
No AC filter No isolation device EMI filter No thing . Even many expensive audiophile AC cables degrade the sound. 


03-05-2023 Post does not mapped to Knowledge Tree
Amir
Iran Tehran
Posts 300
Joined on 02-11-2009

Post #: 1907
Post ID: 27072
Reply to: 27071
One step forward, two steps back
The problem of most solutions in high end audio is "one step forward, two steps back". 
Personally I prefer to hear all information/dynamics of  sound even if the sound is out of control.when I use Isolation Transformer, AC filters (both parallel and series), Acoustic Panels, Bass Traps, Hifi Racks,Vibration control devices ,most expensive AC Cables, Ground Control devices and ... all of them only change the sound in a wrong direction and when we use these devices we lost some information in the sound (like compressing dynamics) and when you lost those information in the sound then your system transparency will decrease and you can not properly judge a new device in your system.

I can order a DC blocker and check it in my system but I doubt if it can help. 

05-03-2023 Post does not mapped to Knowledge Tree
Amir
Iran Tehran
Posts 300
Joined on 02-11-2009

Post #: 1908
Post ID: 27082
Reply to: 27072
Ayre AC filter - Lessloss X640
I have listened to six different AC filters recently in two different audio systems , four of six ac filters were awful but two of them (lessloss and Ayre) were better:- Ayre L5XE - Lessloss x640
I do not judge these two AC filters because I did not put enough time to carefully listen to those filters.you may find those filters useful in your system and I think Ayre L5xe is ok in some systems.What I say is these filters can not solve the AC quality problem when your AC quality is awful.
I removed both filters from my system and now I connect the system directly to home wall AC.

I think the only way is going for high power AC regeneration from purepower .


11-18-2023 Post does not mapped to Knowledge Tree
Amir
Iran Tehran
Posts 300
Joined on 02-11-2009

Post #: 1909
Post ID: 27293
Reply to: 27082
Bad Electricity
I had some experience with bad electricity so i would like to share it here. My audio system does not have ground loop. 
1- digital sources (I have CD Player) is more sensitive to Bad Electricity than Pre/Powers. 
2- if your audio system Continuously play music for many hours when electricity is awful then the sound quality will degrade even if your ac quality back to good level so the system should be shutdown for awhile if you want to have normal sound. It seems like "magnetization phenomena" the bad electricity change/degrade the sound of audio system , I do not know what happen but I guess the bad electricity may affect on transformer core or capacitor or diodes of power supply, actually I do not know what happen there.
11-25-2023 Post does not mapped to Knowledge Tree
Bill
Kensington, NH
Posts 115
Joined on 03-15-2010

Post #: 1910
Post ID: 27299
Reply to: 27293
Quality after shutdown
i shut down my system every night. After 16-18 hours disconnected from the lectricity that it sounds somewhat quieter and more musical. But I Have also noticed that if I shut down the system for several days, on tunen the sound is greatly improved, quieter, smoother with removal of most digital grunge and more lifelike. So something must take several days to occur to remove the damage caused to the music by whatever the electricity is doing to the equipment. I had one such session last week where he sound was close to the best I’ve heard in my system. 
11-26-2023 Post does not mapped to Knowledge Tree
Amir
Iran Tehran
Posts 300
Joined on 02-11-2009

Post #: 1911
Post ID: 27300
Reply to: 27299
System Warm up
when I play over 10 hours per day my audio system in good electricity days (like 13 days of Iranian new year in spring) the sound get better and better every day (fully warm up) but in normal days the best way is shutting down the system when AC quality is bad. when I play less than 2 hours per day in normal days there is no improvement in sound after some days because the system does not fully warm up . in normal days of spring and summer I had only two mid-quality days (friday and saturday) and now in autumn the friday is not good, I do not know why and I do not know what happened to friday. 
My friend recently bought the Victron Inverter / battery (Living Voice use these Inverters) and listened to it and convinced this is not a perfect solution.
it seems there is no solution for AC problem.
Page 96 of 96 (1,911 items) Select Pages:  « First ... « 92 93 94 95 96
   Target    Threads for related reading   Most recent post in related threads   Forum  Replies   Views   Started 
  »  New  What lives in Symmetric Sound?..  The beginning of our journey is ALWAYS symmetrical...  Audio Discussions  Forum     19  169129  05-28-2004
  »  New  Always check power-line polarity...  The Cost of Knowing...  Audio For Dummies ™  Forum     11  107234  07-10-2005
  »  New  RAAL “Water Drop” tweeter for Macondo...  Your comment takes me by surprise...  Horn-Loaded Speakers Forum     77  901320  02-16-2007
  »  New  My feelings about new exciting audio products..  Vacuumstate...  Audio Discussions  Forum     25  257742  04-30-2007
  »  New  Musique Concrete horns..  These are now sold as Kornhent products...  Horn-Loaded Speakers Forum     6  105387  06-12-2007
  »  New  Compression drivers and the “clean signal”...  The NEW “Compression drivers and the clean signal”....  Horn-Loaded Speakers Forum     14  158638  07-12-2007
  »  New  Digi Redux; Drive 1 transport and iDAT-44+ DAC..  Confirmation and Relief...  Didital Things  Forum     26  221215  09-28-2007
  »  New  Metal domes..  Try the one Lansche is using...  Audio Discussions  Forum     6  76602  11-08-2007
  »  New  The power AC Outlets?..  Where to Pick Up the Gong?...  Audio Discussions  Forum     2  41975  10-31-2008
  »  New  The Avicenna's failure is the great Avicenna success!..  New life for Avicenna...  Audio Discussions  Forum     8  81384  02-03-2009
  »  New  Internet and electricity..  Suboptimal. . ....  Didital Things  Forum     1  28375  01-07-2010
  »  New  Electricity... power strips and ac improvements..  Electricity... power strips and ac improvements...  Audio Discussions  Forum     0  16171  03-30-2010
  »  New  Another example of energy..  System Warm up...  Audio Discussions  Forum     1910  9534619  01-29-2011
  »  New  I good spot-light for a turntable?..  Reply...  Analog Playback Forum     15  150423  10-24-2010
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