Dipole speaker
A dipole speaker is a type of a loudspeaker. The sound typically only comes out of the front and back. Dipole spekers do not usually produce very low frequencies because the structure loses audiodynamics the lower the frequency is. With audio crossover is possible to correct frequency response, but there are still limits. This problem can be solved by using a subwoofer.
Dipole Speaker Media
RCA Dimensia speaker mounted on a baffle with no back