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Might the apparently upgraded P3ESR-XD merit remeasuring of its off-axis response?
https://harbeth.co.uk/p3esr-xd-loudspeaker/
Digital Sources: Ayre C-5xeMP universal player; Simaudio Moon Evolution 750D CD player; dCS Puccini SACD player & USB-input D/A converter with Apple Mac mini for media storage; Apple iPod Classic 160GB.
Preamplifier: Simaudio Moon Evolution P-8.
Power Amplifiers: Classé CTM-600 monoblocks, Simaudio Moon Evolution W-7, Balanced Audio Technology VK-55SE.
Integrated Amplifier: Peachtree iDecco.
Loudspeakers: BBC LS3/5A.
Cables: Digital: Kimber Illuminations Orchid AES/EBU, Stereovox CV2 electrical S/PDIF, Belkin USB. Interconnect (balanced): AudioQuest Wild, Ayre Signature. Speaker: AudioQuest Wild, Cardas Neutral Reference. AC: PS Audio Lab, Audio Power Industries, manufacturers' own.
Accessories: Celestion 24" speaker stands, Target TT-5 equipment racks; Ayre Myrtle Blocks; ASC Tube Traps, RPG Abffusor panels; Shunyata Research Dark Field cable elevators; PS Audio Power Plant 300 at 90Hz (preamp, CD players other than Ayre), Audio Power Industries 116 Mk.II & PE-1, APC S-15 AC line conditioners (not power amps). AC power comes from two dedicated 20A circuits, each just 6' from the breaker box.John Atkinson
I would also be very curious to see how the XD update has affected measured and subjective performance (especially measured).