Is it taboo to mod a speaker?

Modding speakers is not uncommon but completely changing drivers is. While this "might" be a step forward in some designs, doing such without looking at the design as a whole could result in a BIG step backwards. Sean
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I changed my B&W800's to active bi-amping. The change and rewiring of the speakers was designed by Dan D'Agostino of Krell. I wouldn't have done it without him.

If someone REALLY knows what they are doing, it can be done, but be very careful!

Richard

I own Magnepan speakers and people mod the heck out of them! fuse bypass, tweeter attenuation bypass, crossover upgrades and internal re-wiring. I won't do any of it(affraid of lost resale value) and maggies are unusually mod friendly. I wouldn't think of trying to upgrade a speaker, if for no better reason then the lost value. I am baffled how some folks think they know more about designing speakers then those who do it for a living! Of course a speaker is designed with in a certain price range(compromises are made) but they work with what they have as a whole! taking or adding anything to that is a risk- the old the total is greater then the sum of its part theory. I wouldn't plan on getting much out of any modified component, its always so hard to prove(I recall more then 1 dispute here is due to a mod)- of course all of this doesn't mean that some folks don't get lucky either- do it right and you may never worry about resale value :o)

Often the high cost of modifying speakers...not to mention the uncertain outcome...is best applied to simply upgrading to an entirely new speaker...which exhibit some of the attributes one was looking to modify in their original speakers...

Everyone else has covered pretty well. The only mods I've done and would recommend to speakers is deadening the cabinets with "dynamat" equivalent. That one is usually an improvement with no downsides/tradeoffs. Changing a driver and doing it properely is quite a bit of work and usually not worth it. I've read conflicting claims about the foam rings to help with diffraction. Someone has done some measurements on them and they don't quite work as the manufacturer claims--I believe.