Hi, your sensitivity ratio in relationship to your dac and amp may actually be too low. Most amps have an input sensitivity about the same as yours and most better preamps have the ability to swing 5 to 25 volts to achieve lifelike dynamic swings in the music.Many people who go from dac to amp are very impressed with the transparency, but when they switch back to a preamp the sound is more lifelike and more to there preference, that is because the pre has the capability to do these voltage swings and the dac does not. A dac to amp usually works best when the amp has a input sensitivity of about .5v, then at least you are getting a 5 to one ratio of voltage swing. Cd players such as accuphase and others have a volume control to adjust the output to match it ideally to your preamp and advise not plugging it directly into your amp, because of the inability of the dac to properly power the amp.
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