I have a pair of Mahlers and have listened to 501s on Mahlers (not on my system). The 501s do a wonderful job of controlling the Mahlers on all frequency ranges and avoiding excesses. Dynamics is excellent overall. It is also fair to say that the 501 have a slightly cool sound and are not as involving as the JRDG 312. However the 501s are compatible with the new JRDG PC1 external Power Factor Correction unit which -- it is said -- brings them significantly closer to the performance of the 312. I have listened briefly to the Klimaxes but not enough to attempt a comparison. . . besides, they were not on the same system as the 501s.
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