Ampspeaker Active loudspeaker systems, studio monitors, electronic crossover, power amplifiers. Our signature AmpSpeaker system was developed by Ole Lund Christensen of SLT and Poul Ladegaard of Bruel & Kjaer. A basic system provides 2400 Watts of clean amplifier power, which together with a 96dB/Watt sensitivity results in very good headroom in medium size control rooms. Up to 1000 Watts RMS available for each loudspeaker unit in the largest 4-way versions. Denmark.