There doesn't seem to be alot of information out there among guitar players on speaker parameters and specifications and even less on any tricks, experimentations, or conceptual ideas on altering tonal aspects and overall output of speakers. This thread is inspired by a post from chris m. in another thread in which he mentioned the Eminence Maverick FDM speaker which has an adjustable magnet for changing the flux density within the voice coil gap for reducing the output of the speaker. That idea could be a good kickoff point for talking about guitar speaker technicals and how the sound of existing speakers might be altered. So say that you have a speaker or more which you like the overall sound of. But maybe there is something about it that you don't like. Maybe it has too much bass, too much treble, is a little too loud overall, or could be better matched to another speaker. The general line of thinking in the guitar world seems to be to just try more speakers. That can be fine if you have lots of time and money to throw at speakers, but if you have a speaker which you mostly like but could use a minor tweak of some sort, it doesn't make as much sense to just throw money at more speakers, being an approach that is slow, expensive, and well, dumbed-down. Of course, some aspects of a speaker can't be practically changed. But some aspects definitely can be. For example, adding doping to a speaker alters the sensitivity and durability. And maybe it is the case that adding magnets or plates to a speaker could alter the overall output of a speaker by increasing/decreasing energy density in the voice coil. Ever heard of using a boost magnet on a speaker? I haven't until tonight. Maybe an 'attenuate' magnet would also be practical. And probably some people here have had ideas, hunches, or practical implementations on altering speakers. Admittedly, I don't know a ton about speaker technicals myself, but it is something I'm interested in learning about. How I understand it, more sensitive speakers better reproduce high frequencies and construction aspects which bring about higher efficiency are lighter cones, smaller voice coils, tighter voice coil gaps, and stronger magnets. And different types of magnets have energy curves (forgive my ignorance of proper technical terms) and saturation points, where say a ceramic magnet will tend to sound more linear and an alnico magnet will tend to cause a speaker to compress at a given energy saturation point. Anyway, there are lots of aspects about speakers that could be discussed and I'm just looking to instigate it. Having read lots of posts from this forum over the years, I know that there are some very knowledgeable people on guitar gear that come here. So it seems as good a place as any to get a discussion going. One thing I would like to mention here is that I find it frustrating as a customer how some guitar speaker manufacturers leave most aspects about their speakers hidden away. For example, Weber, don't even give efficiency figures for their speakers. That sort of thing keeps us guitar players in the dark on important aspects of their speakers.