8W/2 Ohm monophonic amplifier to be installed in flush-mount box P4901. It permits several combinations of passive baffles or speakers with different powers per sound point. From 1 to 8 speakers or baffles can be connected. The speakers or baffles are connected in parallel to the amplifier, in the terminal strip supplied for this purpose. The sound level of the amplifier can be regulated with the sensitivity adjustment potentiomete.