Ashdown BTA 400 Bass Head

Combining straightforward rotary tone controls with two pairs of additional EQ sliders for the more sonically sophisticated, Ashdown’s ABM preamp became an instant classic when it hit the bass world over a decade ago.

The BTA 400 (Big Tube Head) partners a third-generation ABM preamp with a 400-Watt, 8 x KT88 valve output stage for ABM sophistication with bone-crushing tube power. All the ABM features are there – EQ In/Out footswitching, variable Tube/Solid-State input stages, on-board compressor and Sub Harmonic Generator, ,balanced DI Output with Pre/Post EQ switching, FX loop, Tuner output and more. The BTA 400 partners perfectly with a range of Ashdown US Series cabinets.

• Power Output: (RMS) 400W
• Power Requirement: 230 / 115V
• Frequency Response: -3dB at 17Hz and 30kHz
• Speaker Outputs: Minimum impedance 4 Ohms
• High Instrument Input: Impedance 3.9m Ohms, input range 150mV -
• Low Instrument Input: Impedance 10k Ohms, input range 300mV -
• Line Input: Impedance 22k Ohms, input level 0dBu nominal
• Sub Output: Impedance 1k Ohms, level 0dBu Nominal
• DI Output: 600 Ohms balanced, level 0dBu nominal
• Tuner Output: Impedance 22k Ohms, level 0dBu nominal
• EQ:
• - Bass +/-15dB @ 45Hz
• - Middle +/-15dB @ 660Hz
• - Treble +/-15dB @ 7kHz shelving
• - Slider 1 +/-15dB @ 180Hz
• - Slider 2 +/-15dB @ 340Hz
• - Slider 3 +/-15dB @ 1.3kHz
• - Slider 4 +/-15dB @ 2.6kHz
• - Shape (Push Flat) +8dB @ 50Hz & 4kHz, -8dB @ 400Hz, filter slope - 6dB/octave
• Effects Send: Impedance 22k Ohms, level 0dBu nominal
• Effects Return: Impedance 22k Ohms, input level 0dBu Nominal
• H x W x D (mm): 362 x 610 x 300
• Weight (kg): 35