For 21 years I had small Magneplanars (the SMGa model), then after our 3 year old accidentally damaged one of them, my friend kindly loaned the HL-P3s from his uncle's collection of gear. The P3s were here for about 4 months, during which time there was a 2-week period when we had Quad ESL63s on loan.
So I went straight from the 18 year old HL-P3s to brand new P3ESRs. Unfortunately a change of amplifier was also involved, as my Quad 33/303 was sold to help fund the purchase. The stop-gap amplifier is lower powered, a minimalist design but within the recommended power range for the P3ESRs.
To an extent I was taken aback by the difference in presentation between HL-P3 and P3ESR, especially given Alan's care in consistent voicing of the various Harbeth models.
However the owner of the ESL63s allowed me to try the P3ESRs in his own system, and there they did very well (albeit in a big room and a lot louder than I thought they could stand!).
Sometimes I wonder whether the difference comes from the genesis of the original 1990 HL-P3 as a direct LS3/5a alternative - with a similar design brief and possibly similar tweaks to the frequency response - whereas as I understand it the P3ESR is designed to have the same classic "BBC monitor" presentation as the other current Harbeths.
If Alan has the opportunity to do so, it would be very interesting to see a comparison between the frequency response curves of the LS3/5a, HL-P3 and P3ESR and learn what has changed over the years, and why...
The two practical things that have helped low-volume listening with the P3ESRs are an unobstructed wall behind them, and (paradoxically) amplifiers with more generous headroom.


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