Hi AlaskanAVGuy,

I can clarify this for you. The new tweeter can be retrofitted into any of the older models without a crossover change. This said there is still the decision, depending on how old your QS8s are, that there may have been other changes along the way besides just the tweeter in which case it may make sense to utilize the trade-in option to get all the upgrades as opposed to just the tweeters. We can check your purchase date in our system and let you know all the changes.

Ian Colquhoun
President & Chief Engineer