Rerurn to Romy the Cat's Site
In the Forum: Audio Discussions
In the Thread: It’s mad, mad, mad... electricity.
Post Subject: ABB 100APosted by Amir on: 2/5/2023
Both ABB 20KVA UPS and Pure Power 3000 are IGBT transformerless UPS and the AC output of them is not perfect Sinusoidal .like Pure Power the ABB is also sensitive to AC quality.
ABB 20KVA UPS does not isolate Neutral line but the Pure power 3000 isolate Neutral Line.
the Wall AC input Resistance (in my home) is less than 0.15 ohm.
What I learned from "ABB UPS vs Wall AC" is :
1- my Main AC is very polluted
2- my Main AC is Slow/Lagging in Complex/fast Music
3- My Main AC is less Transparent/Clean
4- My Main AC has DC offset (Line DC voltage make the Power Transformer to buzz)
ABB UPS is not good for dynamics and harmonics and It has two main problems :
1- It compress the sound at mid/high frequency , It is similar to signal clipping (like pre-amplifier clip DAC signal, for example DAC output is 7 volts and max input voltage of pre-amplifier is 4volts). if you put compress records then you feel UPS is not so bad but when you put dynamic records the UPS will degrade the sound more. (for example handel furore joyce didonato)
2- Harmonics are damaged and the sound is not velvet and beautiful and it reminds me the bad/noisy Computer playback
the Pure Power 3000 does not have those problems and I love it.
I have convinced the high quality low impedance AC Power will change all transparent audio systems by huge margin.AC quality is the biggest factor for my system.
most high power SS amplifiers need over 30A clean power , it means we need over 20KVA UPS for sound. no company produce it for Audiophiles.
Rerurn to Romy the Cat's Site