Thanks, Naturephoto. Carry on. Your determination to improve on a speaker you already must have liked is much like mine with respect to my Sound Lab M1 ESLs. With the help of some bright fellows I met via the old Sound Lab Owners Group, I have re-configured the entire crossover network and made some improvements to the "mixer box" that re-combines the outputs of the two audio transformers (for bass and treble, respectively) that are fed by the cross-over. There is a whole litany of things to do to improve on the Sound Lab power supply. Sound Lab has since adopted many of these same improvements into their factory-built product.