First heard in the 427 Small Block, Ashdown’s Dual Tube bass preamp was an instant hit, thanks to its solid, articulate bottom end and sparkling highs. With its stunning polished chrome panel, the 550W Ashdown Dual Tube Series 550 head takes this stunning tube preamp design and partners it with the tour proven ABM 500 power stage.

The discerning bass player gets high and low gain inputs, front panel-mounted FX send and return, rotary bass, middle and treble controls with mid shift, bass shift and bright switching, mute switch, rotary gain and master volume controls and a DI output

• Power Output (RMS) 525W(550)
• Power Requirement 230 / 115 / 100V
• Frequency Response -3dB at 20Hz and 20kHz
• Speaker Outputs Speakon/Jack
• High Instrument Input Impedance 1m Ohms, input range 25mV - 1.5V p-p
• Low Instrument Input Impedance 100k Ohms, input range 25mV - 6V p-p
• Line Input Impedance100k Ohms, input level 0dBu nominal
• DI Output 600 Ohms balanced, level 0dBu nominal
• Impedance Minimum 4Ohms
• EQ Fully Passive Middle Treble Bass Bass Shift Middle Shift Bright Switch
• Effects Send 1k Ohms, level 0dBu nominal
• Effects Return 1m Ohms, input level 0dBu Nominal
• Pre-Amp Tubes 1 x ECC82 1 x ECC83
• H x W x D (mm) 150 x 500 x 320
• Weight (kg) 14