Owner's Manual

05
4. AH250 TECHNICAL DETAILS
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 eect only
PHASE switch on front panel (0° - 180°)
ANTIFEEDBACK 20 Hz (o) 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
OTHER
HEIGHT 2 rack units (3.16 in. / 80.3 mm)
WIDTH 10.87 in. / 27.6 cm (19 in. / 48.3 cm with
rack ears)
DEPTH 10.04 in. / 25.5 cm
WEIGHT 6.39 lbs / 2.9 kg
OUTPUT POWER 250W RMS @ 4 ohm, 150W RMS @ 8 ohm
POWER REQUIREMENT 100; 120V; 230V; 240V 50/60Hz (Voltage
is factory preset according to region of
sale).
Markbass amps/combos are manufactured to
be sold and used in the country of purchase,
and are factory preset to that country’s
voltage.
Due to homologation issues, the voltage
may not be changed.
FUSE
EUROPE 3.15 A 250V T 5x20
AUSTRALIA/UK 3.15 A 250V T 5x20
USA/CANADA 6.3 A 250V T 5x20
JAPAN 6.3 A 250VT 5x20