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Quad ESL 2912X Electrostatic Speakers cambridge audio outdoor speaker What is the difference betweenQuad ESL 2912X Electrostatic Floorstanding Speakers at Vinyl Sound Buffalo NY The ESL 2912X is a full range electrostatic floorstanding loudspeaker from Quad (Huntingdon, England, UK), available at Vinyl Sound in Buffalo, NY. Representing the sixth generation of the legendary ESL lineage that Peter Walker launched in 1957, the ESL 2912X is the flagship of the new ESL X Series, built around six electrostatic panel elements, a concentric ring Point