I know this is over 3 years later, but SP930 are not the other 930 that has been mentioned sofar. SP series came about in the mid to late 80's, and share nothing with their predecessor, the Design series model 930 from 1977-79, which were designed by brilliant engineer Edmond May. His designs include the LE series drivers manufactured by JBL, JBL 4310 monitor, L166 Horizon, L65 jubal, and Frazier-May Dixielander. The Marantz models he designed were the Model 4/5/6/7/8 MKII series, First gen High Definition Series, HD44/55/66/77/ & 88, Second gen HD series, HD440/550/660/770/ & 880, DS900/920/930/ & 940. He also designed two lines right after the HD/DS lines, Model X00, which are 200/400/600/ & 800, and the M series, M2/M10/M16. Do not confuse Ed's "MXX" series with the earlier "XXM" series Marantz that were suffixed. The last two designs were in production for less than a year during 1980 when Ed suddenly passed away while at his desk. Marantz built a special anechoic chamber for him to utilize in the refinement of his designs with the Marantz nameplate. His designs are superbly tuned for the flattest, most accurate sound reproduction. In no way are they erratic, muddy, mushy or harsh.