Originally Posted by
whej4312
MTM designs have been around for years. It's just that Joe DiAppolito decided to patent his version. As far as Real Group delay designs, many of your european high-end manufacturers as well as American high-enders use very close tolerances in both driver topology and in the execution, placement and design of the network. Here in Colorado, Avalon Acoustics claim's that they can control off axis group delay and distortion nodes by A; physical placement of the Drive Units on the baffle plane. Augmenting the physical size of the baffle, controlling unwanted resonant points within the confines of the cabinet, and B; Controlling crossover and acoustic anomolies in the crossover with regards to the drivers inherant acoustical/electrical properties within the cabinet design. I have many friend's as well as myself that have experimented with wire types, wire lengths, coils, caps, and resistors to obtain a certain sound. Trust me, these things matter enormously. When you get a chance to hear these speakers again, one thing to look for is a lack of vertical dispersion. MTM's (Symmetrical Array) generally have stellar horizontal charictaristics but lack a true vertical soundstage.They sound closed-in and lack placement of the image vertically. In your L-212's case, driver placement on the baffle plane is a big problem. The baffle is much to wide to make the L-212's behave like a point source. Damping the face acoustically helps a ton. I have a few tricks on that idea. Finally, while we all know that JBL can and does build some of the most remarkable drivers out there, their overall cabinet designs and crossover execution leave a lot to be desired. In my opinion the closest JBL has ever gotten to a real world high-end worthy loudspeaker is, K-2, LSR28, and more importantly the Century Gold. But if you look at the networks or cabinet design in any of them, they still leave me wondering why. Why James B. Lansing Sound Inc. Can't build a speaker that would flatten the industry much like or beloved L-100 and 4310. As simple as they were, they did, to this day what no one has. Sell well, and sell often. Plus that patented, trademarked, and elusive WestCoast Sound we all love. Speed baby, It's that simple...