I've been looking for some user comments as well as I could use the extra power and improvement over the bass in the PL5 which I have in combo with a PL3. I've read both the review of the 6 and the 7 in Absolute Sound and Stereophile. I tend to think the reviewer in Stereophile has it right, and that is that the PL3 has a little extra warmth in the bass which compliments the PL5 and shows up when the PL3 is matched with other amps (too much bass in the few I tried the PL3 with). The Stereophile reviewer is the only reviewer who has published this bit. I think I would not buy the 6 or 7 unless I heard it with the pre-amp I would be using if it were not the PL3. FWIW.
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