I really tried to like the GL KT77's in my Bogner but couldnt get past the brighter top end, rest of it was very rich and almost too much bottom but I didnt care for what it did to the top end and how low I had to run the presence control to not have it be too bright. I went back to my BHT's this weekend and much better for me, fatter, less top end. This was the thrid time I tried the KT77's, 2 different sets. This was not in a Diezel so your mileage may vary. My .02 cents for what its worth.