Regarding Bill's Ohm A, it is indeed a very interesting and unique type of sound. Along with the very special "you are there" characteristics, it is a frustrating design with the most complex theory behind it I have ever seen. At first listen you are aware that something special is indeed happening to the sound...a more 360 boundary-less type of envelope, yet as wonderful as this quality is, on say a female vocal and guitar, it tends to not handle the complex music quite as well, or with as much reality. Bill's IRS is the much more univeral product. While it may lack the Walsh's seduction (I know its very alluring), I can bet the house that its dead accurate. If a new recording is purchased and one wants to really know how it sounds, the IRS is the one. Now I am sure countless mods have been performed since I last heard them a year ago,and judging from the above praise, a breakthrough must have occured. Interestingly, the speaker was spectacular when auditioned outdoors with no room interaction at all. Bill can attest to this. Bill is, of course, a very gifted and visionary engineer with the most unerringly correct (almost scary) intuition regarding audio on the planet. There is no question the Walsh driver in his hands may someday surpass his IRS, but, I am sure he will tell you he sleeps better at night knowing his IRS is there as an absolute reference...........Frank