I have an older pair of Snell KIIV speakers that have a Vifa D26TG-05 tweeter. One of them is blown. I have found on ebay and the seller just happens to live in my town that has a pair of Vifa D27TG-05 for sale and both the 26's and 27's are 6 ohm. My question is from you more experienced speaker builders would these tweeters work in my Snells and would they be an improvement or a down grade? Thanks for any advice.