But if you take the price into account, the Musical Fidelity stuff is way overpriced. Compared to the D1 DAC the Musical Fidelity kit was a tad better, with a bit more stereo “room” or better positioning of the instruments. I used to have a Musical Fidelity X-Can and V-DAC to listen to my collection of classical music. On the front panel of the unit is an On/Off button, a mini jack interface for headphones, and a turning knob that serves as a volume control for both RCA and headphones output. According to the user guide, USB power is double regulated so that no variations affect the output. This requires the USB cable to be either connected to the Mac or to a power converter as it draws its power from the USB port. Smoothly adjust volume levels at fine increments without any undesirable noise or channel imbalance at lower volumes.I connected the D1 to a Mac Mini via optical cable. Volume for headphones and line-out is controlled directly from the D1 front panel via the digitally-controlled analog potentiometer. The audio line-out preamp connects to powered speaker systems, amplifiers, or other external decoders with an analog or optical output. Because of the efficiency of the D1, it can even be powered by a phone or tablet. The D1 is powered directly from the USB input and passed through two stages of regulation to ensure no USB power variations affect the audio quality. The D1 includes the ES9601C SABRE headphone driver amp with circuit protection and is designed for a wide range of headphones that will satisfy even the most critical listeners. The D1 can process digital audio at any bit depth up to 24-bits and any sample rate up to 96kHz (192kHz using optical) Due to the high signal-to-noise specs of the ES9018 and the added benefit of double redundancy power source conversion and filtering, the D1 presents impressive low noise and low distortion characteristics. The D1 uses the ESS ES9018 DAC, which is well regarded for its low noise and high fidelity. Relative Humidity: 5% to 95% non-condensing Operating Temperature: 32 to 95 degrees F
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