Timewave DSP audio filters all in excellent physical and operating condition, with DC power cords. DSP-9+ $80 shipped. (s/n 62342) DSP-59+ $140 shipped. (s/n 50712) DSP-599zx $250 shipped. (s/n 32275, older version not latest firmware v.5.0) Paypal preferred; cash, check, postal money order. Please contact via email email@example.com Manuals for all 3 can be downloaded from Timewave and are highly recommended to have--the 59+ and especially the 599zx have features and internal jumper settings that require the manual.