This amplifier module achieves peak power at an operating voltage of 16 Vdc with a 4ø loudspeaker. With lower voltages & higher resistance loudspeakers power will decrease accordingly. If the signal source has a low output power e.g. a micropho This amplifier module achieves peak power at an operating voltage of 16 Vdc with a 4 Omega loudspeaker. With lower voltages & higher resistance loudspeakers power will decrease accordingly. If the signal source has a low output power e.g. a microphone it will be necessary to connect a pre-amplifier i.e. Order Code N69AW between the source amp the potentiometer. Specifications Outputmaximum 40W music power Operating voltage 6-16 Vdc Loudspeaker connection 4-8 Omega Frequency responseapprox. 20-25000 Hz Dimensionsapprox. 61 x 35 x 23mm