HI Scott,I also asked the same question but from the home product side,I think it does sound different, I know using larger horns is like night and day,I'm hoping some one can post some of the gap info for the 50's & 60's drivers,some changes were made that did change the sound/part swaping of the 60's to 70's drivers,I did have a voice coil come loose on a 375-glue failed(didnt sound right at low levels) but I caught it before it was damaged and putting glue on a tooth pick did the trick and that was over 10 years ago and still sound fine,at that time I also tryed to put a 2440 dia in this 375 but it wouldnt fit the gap,but it did line up with the alinement pegs -JBLWOLF