https://www.engadget.com/2008-06-23-sony-intros-str-dg520-str-dg720-and-str-dg820-av-receivers.html
Sony intros STR-DG520, STR-DG720 and STR-DG820 AV receivers
Jun 23, 2008 - Sony's got a new trio of AV receivers to get your work week started, and we'll hit 'em up in order of least fancy to most. The entry-level STR-DG520 (5 x...
str dg520sonyintrosavreceivers