Mr Johnmaxx, thanks for joining in. So if aluminum is not a serious contender for speaker enclosures how do you explain the excellent decay plot on the YGA (http://stereophile.com/floorloudspeakers/yg_acoustics_anat_reference_ii_professional_loudspeaker/index4.html) and the hardly adequate ones on the Watt (http://stereophile.com/floorloudspeakers/607wilson/index4.html)
