Is it taboo to mod a speaker?


I often read and hear about modifications done to source equipment, amplifiers, DACS, and ocassionally I read about someone doing stuff to the crossover portion of a loudspeaker. I myself plan to have someone modify my Pioneer DVD in a few months. However, I rarely read about anyone modding a loudspeaker by exchanging drivers. I have never heard of anyone exchange or upgrading to driver ABC from drive XYZ. Is it done? Does anyone do this professionally?
matchstikman
I'd add, glue on felt ring around the tweeter, plug port if too much bass, in addition to Zaikesman's excellent post.
...And of course, I think we've forgotten to mention the #1 speaker mod of all time - listening with the grilles removed.
Upgrading the caps in the tweeter's filter will greatly help some speakers. Some folks think this is the most important passive component in the entire system. Change with a like value.

You can go to forums like the Madisound and it is likely that someone has experience with your speaker or one like it.

I remain,
I replaced all the resistors in in my Dunlavy SC-III's with Mills and removed the all the quick-connects on the crossover and soldered the internal wires directly to the PCB. Last week I replaced all but one of the Solen capacitors with Auricaps, the remaining cap is 62 mF and there's no Auricap equivilent (even if there was I don't think I could afford it). I also added a set of Cardas binding posts and soldered the internal biwire leads to it for single wiring.

Each mod was an improvement, but none so much as the Auricaps. These caps are fanstastic! The music is smoother, more detailed, more dynamic, more everything, etc, etc, etc...

Next I'll remove the quick-connects at the driver end and replace the inadequate wooden plinth with one made of granite. I'd like the upgrade the internal wiring but with five drivers per side and six foot tall cabinets this could get expensive. Somebody please stop me!