Loudspeakers based on the Lowther full-range driver have a considerable following—our own Art Dudley included—but most will admit that the driver has its limitations, including some midrange resonant peaks and less-than-impressive bass response. These have been addressed in The Second Rethm by a set of modifications to the driver and the availability of an extension to the cabinet that produces better bass response. I heard a couple of the Rethm speakers (I don’t remember which models) a few years ago at CES, and was not too impressed, but I quite liked the sound of The Second Rethm with the cabinet extension. The extension adds $2000 to the $7500/pair price, but I suspect it’s worth it.