The d&b D12 amplifier is a two channel power amplifier incorporating digital signal processors (DSP) to provide speaker specific set ups that include comprehensive protection functions for all current d&b loudspeakers. The D12 has both digital and analog signal inputs and outputs, remote control and monitoring abilities and interfaces, a sine wave and pink noise signal generator and controls and status indicator. A user definable 4-band parametric equaliser and signal delay capability of up to 340ms are incorporated; these can be applied independently to each channel. The D12 also includes d&b Sense Drive for accurate control of the driver membranes in d&b subwoofers, resulting in an extremely precise low frequency performance. d&b load monitoring can provide both LF and HF driver status information within systems containing multiple drivers, even if these drivers are passively crossed over.