Columns: Driver Unit Model No. | Release Year | Output Voltage (RMS) | Inputs | Outputs | Notes
SRM-001 | 1995 | 240V | 1x Miniplug | 1x Pro Bias, Special 6 Pin | Solid state, battery operated for portable use | SRM-300 / SRM-310 | 2003 | 350V | 1x RCA | 2x Pro Bias, RCA Loop Out | Solid state, styled as an earspeaker stand | SRM-252A / SRM-252II | 2006 | 280V | 1x RCA | 1x Pro Bias, RCA Loop Out | Solid state | SRM-323A / SRM-323II | 2006 | 400V | 2x RCA | 2x Pro Bias, RCA Loop Out | Solid state | SRM-323S | 2010 | 400V | 2x RCA | 2x Pro Bias, RCA Loop Out | Solid state | SRM-727A | 2006 | 450V | 1x Balanced XLR, 2x RCA | 2x Pro Bias, RCA Loop Out | Solid state | SRM-727II | 2007 | 450V | 1x Balanced XLR, 1x RCA | 2x Pro Bias, RCA Loop Out | Solid state | SRM-006tA / SRM-006tII | 2006 | 300V | 1x Balanced XLR, 2x RCA | 2x Pro Bias, RCA Loop Out | Vacuum tube (2x 6FQ7/6CG7) / Solid state hybrid | SRM-006tS | 2010 | 300V | 1x Balanced XLR, 2x RCA | 2x Pro Bias, RCA Loop Out | Vacuum tube | SRM-007tA / SRM-007tII | 2006 | 340V | 1x Balanced XLR, 3x RCA | 2x Pro Bias, RCA Loop Out | Vacuum tube (4x 6FQ7/6CG7) / Solid state hybrid | SRM-600 Limited | 2009 | 340V | 1x Balanced XLR, 3x RCA | 2x Pro Bias, RCA Loop Out | Vacuum tube (2x ECC99) / Solid state hybrid