I am trying to stay brand agnostic here, but I am targeting the typical lower to mid end production tube amps that have the "Designed for" or "Special Design" Speaker in them. Typically these are Eminence speakers, and generally Eminence has made a decent rep for themselves recently. Whats the deal with these speakers? Are they just cheap knock offs? Do they really spend the time designing these speakers to be voiced for the amp? You seem to hear this a lot ... "Swap the tubes, swap the speaker and <insert cheaper amp here> is a killer amp that's just a good as <insert high priced amp here>" I guess my question is why don't the manufactures just put in the better speaker in the 1st place if that's the case. What? we're looking at a $50 price bump to put in a primo speaker? If the speaker is as special as they advertise it as, then it's not really an "upgrade" it's just a personal taste issue to change them out. The other issue I have is how do I know what my stock speaker compares to? The web sites of the speaker manufactures have lots of detailed info on their aftermarket stuff. But how do I know how they compare to the stock one? The stock speaker may be voice similarly to what I am looking to "upgrade" to, and how do I know with out spending $ to try it out? Just seems that the deck is loaded, and its not in the consumer's favor.