The 818 has it. SCD is a function of hieght channel tech. My old yammy has it with its presense speakers as well. My only gripe is with cheapo heights you are potentially mudding your front stage. When I has "lesser" speakers but closer in qulaity the heights the results were nice. Now my front stage totally trumps my heights , prefer to leave the dialogue in the cc where it belongs. I have also noticed it sounds unatural when sitting off axis. My 2 cents.