Eureka - I feel like Archimedes

[mbhangui]

I was never happy with my Yamaha 667 AVR. The soundstage was recessed. Whatever I have done till now (changing the speakers to RTiA9, improving the source, going for external DAC) and to the extent assembling an amplifier based on design by Mauro Penasa and linuxguy has been a pursuit to improve the SQ.

I found the culprit for the abysmal performance of 667 - The UPS - The so called sinewave UPS from APC BI 850.

After connecting the 667 directory to the MSEB power supply, I have a massive difference in soundstage, quality, sharpness and even bass. At the moment, this is a moment of truth for me. Every song that I have heard till now sounds so different :yahoo:

I am not sure, but it looks like the output may not be true sine wave or it may not be supplying power the instant, the AVR needs it.

Lucky that I was not in a bathtub and unlike Archimedes I don't have the answer but I am happy with the improvement in SQ but curious to know what could be happening? Is there any way to see the waveform of the AC source without using an oscilloscope?

 

[ruenigma]

That's a very interesting observation Manavendra. Good to hear that it's working well for you.

 

[jls001]

:lol: Just make sure that you have your pants on when you run out to the street and shout eureka.

By your description, it looks like your UPS is not supplying enough current when it is needed. Many audiophile-grade power conditioning devices are accused of the same crime.

 

[spirovious]

:lol: Just make sure that you have your pants on when you run out to the street and shout eureka.

:lol::lol::lol:
Its possible,I too feel sometimes 667 perform very well & sometimes not as clean as previous.The possibly the power.I have connected 667,SW & HTPC to same spike guard.

 

[Audiodoc]

AVR need the right voltage and current to operate optimally. Initially my denon used to sound so dull in the evenings which gave me the hint the the power socket was not giving enough juice at peak hours. On checking with a multimeter indeed the ac voltage was 190 volts. On installing a 5 kva stabiliser with an output of 230 volts the avr began singing with the nice punch in the bass lines as well as enhanced midrange.

 

[koushik]

Yes, it is very common with me as well. Sometimes it sounds just great, and other day dull and noisy. The power supply plays a great part in this; a proper 220V 50Hz is very important which, most of the time in summer, is difficult to get when all the houses are running multiple fans, ACs, Coolers and what not!

 

[olly42]

+1 to all the gurus a 5 kva stabiliser with an output of 230 volts worked for me as well. Stable power supply is very critical in any set up Yeah and dont forget to shout Eureka

 

[koushik]

EUREKA !!!!!
Shouted as requested by you

 

[avidyarthy]

Just a high rating stabilizer is more than sufficient. I have been running my gadgets using 4 kva V-Guard (suitable for AC) ones without any issues. Just rock steady performance, no matter what the supply voltage ever is ... well, it has never gone down below 140 V, and even if it does, the protection circuit built-in the stabilizer would cut out the power flow to zero ....

AND, when there is no electricity supply ... let the gadgets get some sleep too, why push them by feeding low spec back-up electricity?

 

[mbhangui]

:lol::lol::lol:
Its possible,I too feel sometimes 667 perform very well & sometimes not as clean as previous.The possibly the power.I have connected 667,SW & HTPC to same spike guard.

I also had everything connected to one spike guard which was connected to the UPS. Now I have connected the AVR directly to the mains. My DAC is also connected to the UPS. Though I don't think it will make a difference, tonight I will connect the DAC also directly to the mains.