HEAD type bass amplifier with both tube and transistor preamps and double power amp, working in BIAMP, STEREO or MONO modes. The switchable mode enables wide range of speaker cabinets to connect varying in impedance from 2 to 16 Ohm and handling power from 200 up to 750W. The amplifier uses a very efficient and at the same time easy to operate MLO system equalization control for fast and accurate sound tailoring. Unique OPTICAL LIMITER is built in for fast and noiseless operation. Possibility to “cross” the amplifier with an additional preamp. Connecting an external preamp creates a configuration of 2 selectable independent channels. The use of additional preamp brings a wide range of new sound creation opportunities: 2 identical panels with separate input control, tone, limiter and volume. Preferred tone shape, input sensitivity, tube saturation, volume and compression can be set for each channel independently and switched between the channels while playing. Also an external sound effect can be connected to each of the channels. A specially designed TAURUS TX-Cross dedicated preamp is used to create the stereo system.