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Product Description

Ashdown BTA 400 Hybrid bass amp head. This combines the preamp section of the ABM500 with 8 x KT88 valve output stage for ABM performance with high volume tube power. The complete ABM features are included – EQ In/Out footswitching, variable Tube/Solid-State input stages,in built compressor and Sub Harmonic Generator, ,balanced DI Output with Pre/Post EQ switching, FX loop, Tuner output and more. Delivers 400 watts.

Specification
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