Loudspeaker box with passive loudspeaker - has passive speaker placed adjacent to active loudspeaker and power amplifier with mechanical feedback

摘要

The loudspeaker box has several loudspeakers and a power amplifier with feedback. a correction circuit adjusts for bass frequencies. An acoustic impedance transformer is mounted on the front of the box next to the active loudspeaker. This acoustic impedance has the form of a passive loudspeaker and is coupled by the air in the box to the active loudspeaker. Any coupling resonance other than the one required is eliminated by the feedback. The internal walls of the box are made to reflect low frequencies.