![]() ![]() This discovery inspired a frenetic shuffle through my CD collection that lasted well into the night. The sonic improvement in each case was substantial. Both increased the depth of the soundstage and the textures of instruments and vocals on Bob Marley's Legend CD, but the RDC-7 provided additional clarity and punch to the bass guitar and kick drum. Both configurations added a whole new level of enjoyment to CD playback. Therefore, both the upsampling and D/A conversion of each device were included in the comparison. The RDC-7, when auditioned alone, was sourced from one of its digital inputs. The analog output of the stereo-only Perpetual Technologies was routed to the main left and right channels of the RDC-7's multichannel analog pass-through inputs. The Perpetual Technologies P-1A/P-3A combination upsampler and D/A converter arrived at my studio about the same time as the Integra Research RDC-7, so I was able to compare the two.
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