Kg: My Brother is using an ST-140 for his tweeters, an ST-202+ for his mids, a dual mono ST-202 for his woofers and a dual mono 442 for his subs. All of the amps are heavily modified and actively crossed over at 24 dB's / octave. The speakers are a vertically mirror imaged array consisting of a tweeter located in the center, a 5" mid above and below that, a 9" woofer mounted above and below the mids. All of these drivers are Morel's, which he chose for their very low weight to motor structure ratio i.e. transient characteristics. The subs are mounted off to the sides of this vertical array and down-loaded. Each driver is housed in their own sealed and stuffed PVC tube to minimize crosstalk and reduce internal standing waves. This also allowed him to dial in the proper time alignment for each driver since each driver is in its' own housing. We did this with the aid of a digital room correction device i.e. hooked up the test equipment and adjusted the speakers for the least amount of necessary correction and then removed the digital correction devices. Like most of the things we have going on with audio in my family, it is a never-ending project : ) Sean
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