georgehifi. you refer to the Kantor load as not "too severe" but it *is* quite severe running off the PL's 16 ohm tap (you failed to mention that the measurement was done off this tap). A quick look at the load's dip at 4500hz should convince everyone that this load isn't a good one for the PL at least not off that tap.
if the speaker is efficient however, you can expect completely different results driven off the PL 4 ohm tap.
if the speaker is efficient however, you can expect completely different results driven off the PL 4 ohm tap.