Lugnut, at one time i had an entire list of mods to do to the Klipsch "Classic" series of speakers. Most of these notes are tied up in one of my old computers, which i'm having a hard time trying to access. Someone thought enough of these notes to post them on Klipsch's own bulletin board forum, so you might be able to find someone that had downloaded them or can point you to where they are posted.
I will say that i have learned a LOT more about the inner workings of speakers since i wrote those notes, so some of them will be somewhat out of date compared to what i would do now. However, most all of them will still give you FAR superior performance to what stock Klipsch are capable of delivering. I have read postings from some folks on various forums that had followed various tips that i had mentioned. All of the comments have been extremely positive. Most were basically overwhelmed by how much fuller, warmer and smoother the speakers were with a complete lack of "horny glare". One guy even complained that his Heresy's now had "too much" deep bass. While i doubt that this was an accurate assessment of things, that would be easily correctable if someone were to feel that way.
As to the La Scala's, that has been put on the back burner. I've got other more pertinent projects ( at least to me ) that i need to get done. I am glad that i've put them off though, as i've come up with a few other ideas that i'd like to incorporate. If i can ever get around to doing them as i intend to, i will take the time to document and photograph the entire procedure. Sean
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