The Markbass R500 is a bass amplifier head that will have you rocking out old-school, rocking hard, creating your own alternative rock, or shredding up the stage stealing the spotlight from your guitarists! The 500W analog R500 amp (at 4 ohms; 300W at 8 ohms) features a tube preamp that will break up just the way you want it to, and a newly designed limiter that produces glorious distortion instead of cramping your style. The simple 4-band EQ gives you all you need to access a wide range of sounds for any genre. As far as controls, the Gain knob is for the amount of tube overdrive, whereas the Master knob is for your volume.
Analog amp with a tube preamp which provides 500W at 4 ohms; 300W at 8 ohms
1/4" input jack works with passive or active basses
Gain knob controls tube overdrive
Master knob controls volume
Line out controls rear XLR line out volume level
4-band EQ: Low, Low Mid, High Mid, HIgh
Neutrik Speakon Combo out jacks for use with 1/4" or Speakon speaker cables
Balanced XLR line out
Pre EQ/Post EQ switch to determine whether the output signal is effected by the EQ settings or not
Ground lift switch to eliminate hum
Tuner out sends unbalanced signal sent to a tuner, amp or recording equipment not needing a balanced signal
Send and Return Effect ensures main signal continues even if something dies in your effects chain
Dual-sided fiberglass PC boards with lined perforations for high-quality solder connections
Surface-mount components are silicon-sealed to isolate vibrations
Computer-grade pre-assembled ribbon connector cable harnesses and ribbons for noise-free operation
Integrated threaded posts for easy assembly/disassembly and added durability
Rigid 2mm thick aluminium chassis for a long-lasting finish
Power
Input impedance: 500Kohm, max. voltage: 9 Vpp
Effect Return impedance: 33Kohm, max. voltage: 12 Vpp
Output Power: 300W RMS at 8 ohms, 500W RMS at 4 ohms
Power Requirement: 100V; 120V; 230V; 240V; 50/60Hz
Controls
GAIN: 80dB to +25dB range
GROUND LIFT: Switch on rear panel
MASTER VOLUME
Optional footswitch: mute
Equalization
LOW
Center frequency: 80Hz; level ±12dB
LOW MID
Center frequency 400Hz, level ±12dB
HIGH MID
Center frequency 800Hz, level ±12dB
HIGH
3kHz shelf; level ±12dB
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" x 2
Other
Dimensions: 8.16"(W) x 3.39"(H) x 11.89"(D)
Weight: 8.16 lbs.
Korpa 
