All models are equipped with Markbass-designed digital power supply circuitry.

Minimum ohm load for all Markbass heads is 4 ohms.

Markbass amps/combos are manufactured to be sold and used in the country of purchase, and they are factory preset to that country’s voltage.
Due to homologation issues, the voltage may not be changed.

Rack ear kit included.

INPUTS

INPUT
impedance: 500 Kohm, max. voltage: 9 Vpp
EFFECT RETURN
impedance: 33 Kohm, max. voltage: 12 Vpp

CONTROLS

GAIN
-80 dB to +25 dB range
LINE OUT
level control on front panel
PRE/POST EQ (for line out)
switch on rear panel
GROUND LIFT
switch on rear panel
MASTER VOLUME

EQUALIZATION

LOW
center frequency: 40 Hz; level ±16 dB
LOW-MID
semi-parametric: frequency 100-800 Hz, level ±16 dB
HIGH-MID
semi-parametric: frequency 700 Hz-6 kHz, level ±16 dB
HIGH
10 kHz shelf; level ±16 dB
VPF (Variable Pre-shape Filter)
center frequency 380 Hz (cut)
VLE (Vintage Loudspeaker Emulator)
250 Hz-20 kHz cut

OUTPUTS

EFFECT SEND
unbalanced, max. voltage 12 Vpp (pre-EQ)
TUNER OUT
unbalanced, max. voltage 2 Vpp
LINE OUT
balanced XLR, max. voltage 25 Vpp
SPEAKER OUT
speakon, 1/4"

OTHER

HEIGHT
3.39 in. / 8.6 cm (2U)
DEPTH
11.9 in. / 30.2 cm
WIDTH
14.5" / 36.8 cm (with rack ears: 19" / 48.3 cm)
WEIGHT
7.5 lbs / 3.4 kg
OUTPUT POWER
450W RMS @ 8 ohm, 750W RMS @ 4 ohm
POWER REQUIREMENT
100/120V; 230V; 240V
50/60Hz
(Voltage is factory preset according to region of sale)

No one complains about our 500 watt heads being quiet, but if headroom is what you crave, you will find it in the SD 800, our high-power head. As with the F1, a digital power amp gives you speed and clarity at high volumes. This head is the top choice for big-stage applications and for rocking out with very loud bands. Recommended for big cabinets (8x10, 6x10 or 2x15), or two-cabinet rigs.