My old Rowland 7M monoblock furnaces take about 8 hours of playing time to stabilize sonically and yield their best when starting from standby. . . . more if you turn them on from totally off-cold. Current cool-running JRDG 312 takes longer than 7M. . . couple hrs playing after idling in ON position overnight; a day when bringing online from idle; couple of days when starting it from long off-cold. . . . admittedly, I am anally retentive. . . or delusional as some may suggest.
