The R 500's preamp uses one ECC83 tube, manufactured by JJ Electronics.
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.
impedance 500 Kohm, max. voltage 9 Vpp
impedance 33 Kohm, max. voltage 12 Vpp
-80 dB to +25 dB range
switch on rear panel
center frequency: 80 Hz; level: ±12 dB
center frequency: 400 Hz, level: ±12 dB
center frequency: 800 Hz, level: ±12 dB
3 kHz shelf, level: ±12 dB
balanced XLR, max. voltage 25 Vpp
unbalanced, max. voltage 12 Vpp (pre-EQ)
unbalanced, max. voltage 2 Vpp
speakon / 1/4" (x2)
8.16 lbs / 3,7 kg
11.89 in. / 30.2 cm
3.39 in. / 8.6 cm (2 rack units)
14.5" / 36.8 cm (with rack ears: 19" / 48.3 cm)
500W RMS @ 4 ohms, 300W RMS @ 8 ohms
100V; 120V; 230V; 240V
(Voltage is factory preset according to region of sale)