"... Also notice the 452 requires 4.2 volts on its balanced inputs to reach its rated power output. With a typical Audio Research preamp, this might mean you could end up cranking the volume higher than you expect for normal listening but finding the sound balance pretty thin; lacking in dynamics and bass slam, depending on your source. At least, this is what I have experienced..."
Same for me with a AR LS-7 and a Mac MC402.
Same for me with a AR LS-7 and a Mac MC402.