I'm on Long Island, NY. The house lights dim a lot in the summer when the central AC turns on, but this might just need a call to the power company for a better line or a hard start kit ( in all honesty i probably wont do either). I'm not sure if that would qualify as a full blown brown out. We get lightning but I have never lost anything to it, nor am I aware of anyone else who has. We loose power quite often, probably 4+ times a year.

Protection is just one part of the picture. I also would like to increase sound quality if possible through power conditioning, or not decrease it by leaving out the conditioner. I'm just not sure whats best. I suspect that a properly sized conditioner could not hurt, but a undersized one may be a burden. Also some conditioners have pass through plugs that are only surge protected so maybe those are the best fit.