Just been reading your coments regarding compression drivers. I've done testing on sd-450n, bm450, d44. They all sound quite similar. The d45 is similar to the jbl 242x series. I compared to B&C, selenium, beyma cp 380m and new beyma cp385n. Out of all of them I liked the BM 450 the best, very smooth open and clean, especially on the P audio PH 220 horn which is very nice.

The sd-450n sounded a little gritty, but not that different from the BM, they both share a similar coil assemble but obviously the sn is a neo. The beyma cp385n is a reel ripper if your after max. spl go for that.

cheers

alex