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Item # 583793

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Markbass Markacoustic AH250 250W Tube Acoustic Amp Head
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      Markbass Markacoustic AH250 250W Tube Acoustic Amp Head (583793)
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Lightweight acoustic amp with strength and craftsmanship that is undeniably Markbass.

The Markacoustic AH250 is a compact and lightweight amp head for acoustic instruments. Connect it to your preferred cabinets, or use it as a preamp without a speaker—just take a line from the XLR out and set your master volume to zero. The analog amp is 150W @ 8 Ohms or 250W @ 4 Ohms, and offers two preamp channels (one 1/4" jack and one XLR/1/4" combo jack with switchable 48V phantom power). Anti-feedback and phase reverse controls allow you to capture the true essence of your acoustic sound while enjoying serious headroom.

The Markacoustic AH 250 acoustic head is a great choice for anyone who needs a small, light and portable amp head to amplify acoustic instruments. It can be connected to your preferred cabinet/s, or directly to a mixer via the line out (you can use it as a preamp without connecting it to a speaker—just set your master volume to zero).

The amplifier head is powered by an analog amp (150W @ 8 Ohms/250W @ 4 Ohms) and features Markbass' own custom-designed digital power supply circuitry. There are two preamp channels, with a 1/4" jack input for Channel 1, and an XLR/1/4" combo input for Channel 2, with switchable 48V phantom power.

Anti-feedback and phase reverse controls allow you to easily manage feedback and phase problems and capture the true essence of your acoustic sound while giving you serious headroom.

Markbass Markacoustic AH250 250W Tube Acoustic Amp Head Features:

  • Unbalanced 1/4" input jack
    Balanced xlr / 1/4" combo input jack
    Ch1 gain
    Ch1 clip led
    Ch1 low equalization control knob
    Ch1 mid equalization control knob
    Ch1 high equalization control knob
    Ch1 effect mix control knob
    Effect selection knob
    Phase switch
    Antifeedback control knob
    Power on led
    Ch2 gain (pull out to engage phantom power on balanced XLR - 2 -)
    Ch2 clip led
    Ch2 low equalization control knob
    Ch2 high equalization control knob
    Ch2 vpf filter level control knob
    Ch2 effect mix control knob
    Line out level knob
    Master volume level knob
    Mix clip led
    Main on/off switch
    Ah250 rear pane l
    Ac power socket
    Speaker out speakon / 1/4" combo jack
    Speaker out 1/4" jack
    Insert point
    Ground lift control switch
    Line out XLR


Markbass Markacoustic AH250 250W Tube Acoustic Amp Head Specifications:

  • INPUTS
    Input ch1 unbalanced impedance: 500 KOhm, max. voltage: 10 Vpp
    Input ch2 unbalanced impedance: 1 Mohm, max. voltage: 10 Vpp
    Balanced impedance: 1 Mohm, max. voltage: 20 Vpp
    Insert point impedance: 10 Kohm, max. voltage: 20 Vpp

    CONTROLS
    Gain CH1 -45 dB to +28 dB range
    Gain CH2 -43 dB to +26 dB range
    Line out level control on front panel
    Phantom power 48V DC (on CH2 Input, pulling out the CH2 GAIN knob)
    Ground lift switch on rear panel
    Effect mix Internal effect only
    Phase switch on front panel (0° to 180°)
    Antifeedback 20 Hz (off ) to 400 Hz range
    Master volume
    Equalization CH1
    Low 40 Hz; level: ±16 dB
    Mid 600 Hz; level: ±16 dB
    High 6 kHz; level: ±16 dB
    Equalization CH2
    Low 60 Hz; level: ±16 dB
    High 5 kHz; level: ±16 dB
    VPF (Variable Pre-shape Filter) center frequency 380 Hz (cut)

    ONBOARD DIGITAL EFFECTS
    Chorus 1
    Room
    Revb 1
    Revb 2
    Hall
    Chorus 2
    Outputs
    Insert point unbalanced, max. voltage 25 Vpp
    Line out balanced XLR, max. voltage 20 Vpp
    Speaker out speakon / 1/4" combo jack, 1/4" jack
    Dimensions: Height: 3.16" (2 rack units)H x 10.87"W x 10"D
    Weight: 6.39lb.
    Output power: 250W RMS @ 4 Ohm, 150W RMS @ 8 Ohm


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