US 12,231,842 B2
Passively assisted loudspeaker enclosure
Alan Robert Cross, Howell, MI (US); Jay Krusac, Farmington Hills, MI (US); and Erich Zachariah Mellits, Washington, MI (US)
Assigned to ALPS ALPINE CO., LTD., Tokyo (JP)
Filed by ALPS ALPINE CO., LTD., Tokyo (JP)
Filed on Nov. 29, 2022, as Appl. No. 18/059,919.
Claims priority of provisional application 63/300,340, filed on Jan. 18, 2022.
Prior Publication US 2023/0232150 A1, Jul. 20, 2023
Int. Cl. H04R 1/28 (2006.01); H04R 1/02 (2006.01); H04R 1/22 (2006.01)
CPC H04R 1/2834 (2013.01) [H04R 1/025 (2013.01); H04R 1/227 (2013.01)] 40 Claims
OG exemplary drawing
 
1. A loudspeaker configured to generate sound waves, the loudspeaker comprising:
a primary chamber comprising at least one speaker driver that generates sound waves, radiates a first portion of the sound waves away from the primary chamber, and radiates a second portion of the sound waves into the primary chamber, wherein the first portion of the sound waves comprises fundamental output sound waves;
at least one passive radiator having an effective area configured to radiate intermediate sound waves associated with the second portion of the sound waves; and
at least one secondary chamber acoustically coupled to the primary chamber via the at least one passive radiator, the at least one secondary chamber comprising at least one output port having an output area, at least one output port configured to allow radiation of intermediate sound waves received from the at least one passive radiator out of the at least one secondary chamber and away from the loudspeaker;
wherein the at least one secondary chamber is configured to increase an acoustic output power of the loudspeaker by at least 5 dB in a low frequency range compared to another loudspeaker not having the at least one secondary chamber but otherwise identical to the loudspeaker; and
wherein the low frequency range comprises frequencies lower than a center frequency of the fundamental output sound waves.