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Erviins

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  1. I evaluated effect of different end-power supplies using Triangle Comete monitors and Musical Fidelity A1-X class A amplifier, Audioquest FLX/SL1P-14/4 speaker cables, SAEC sus-380 Triple C USB cable (20cm), Evidence Audio Lyrics RCA cables. Power cable - LessLoss DFPC. Another idea: if you play music sourcing from external storage (e.g. I keep library on 4 TB Seagate SSD connected via USB 3.0)- try copy music you going to play to your hard drive (SSD) and then listen. There is noticeable improvement.
  2. I am using Pre Box S2 Digital for two months. Today I had a chance to evaluate sound quality switching it to 5V power supply from iFi Audio iPower. Before Pre Box was fed from JCAT UCB card which is powered by Sbooster botw p&p eco linear psu. Challenge was to see - if external power supply could do better than ultra clean USB power. As a reference I used 24/192 Robert Ludwig's MasterDisk (Dire Straits) and several DSD files (Diana Krall, Sting, Mike Oldfield). Summary - there is noticeable improvement in sound quality when quality external power supply is connected to Pre Box S2 Digital DAC. I should admit- it is not big improvement since my dedicated USB card has already clean, noise-less power supply. Sound difference can be described as: 1) more presence - vocal and several instruments moved to me a bit closer in the soundstage (quite a pleasing feeling); 2) muted background - it become more silent increasing clarity of instruments and vocal sounds; 3) precise speed - each note, drums hit had better attack, sharpness (but not sounding harsh), and bass notes were more accurate. Even current power change made my system sound just 2% better, I like such upgrade.
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