A speaker system, comprising: a speaker unit that outputs sound; a cabinet having an inner space and a wall to which the speaker unit is attached; a front and back of the cabinet are indicated by a Z-axis, a length of the rectangular cabinet is indicated by an X-axis and a width of the cabinet is indicated by a Y-axis, and an acoustic transmission tube that is disposed inside the cabinet, and has an open end and a closed end, the acoustic transmission tube extends in the length direction of the cabinet, wherein the inside of cabinet is separated acoustically into a space that contains the acoustic transmission tube and a rear volume of the speaker unit, wherein the rear volume is a volume of the inner space of the cabinet excluding the acoustic transmission tube, wherein an outer surface of the cabinet includes the wall, wherein the cabinet includes a front panel, a rear panel, side panels disposed at both sides of the X-axis of the cabinet, side panels disposed at both sides of the Y-axis of the cabinet, a first cabinet portion that constitutes a front portion thereof and a second cabinet portion that constitutes a rear portion thereof, the speaker unit is attached to the wall, a part of a side wall of the acoustic transmission tube is a partition plate that has apertures which communicates with the inner space of the cabinet and a space in the acoustic transmission tube, the partition plate dividing the inside of the cabinet into a first space and a plurality of second spaces (A2 to A6), except in a portion in which the first space and the second spaces (A2 to A6) communicate with each other, wherein the apertures are made of a plurality of holes arranged along the direction in which the acoustic transmission tube extends, wherein the acoustic transmission tube has one tubular space in which said first space and said second spaces (A2 to A6) are serially connected, and wherein the tubular space has the open end and the closed end, and wherein the first space is elongated along the X-axis and the each of the second spaces (A2 to A6) are elongated along the Y-axis perpendicular to the X-axis, the side wall of the acoustic transmission tube is disposed so as to orthogonally intersect a lengthwise direction of standing waves occurring inside the cabinet. a speaker unit that outputs sound; a cabinet having an inner space and a wall to which the speaker unit is attached; a front and back of the cabinet are indicated by a Z-axis, a length of the rectangular cabinet is indicated by an X-axis and a width of the cabinet is indicated by a Y-axis, and an acoustic transmission tube that is disposed inside the cabinet, and has an open end and a closed end, the acoustic transmission tube extends in the length direction of the cabinet, wherein the inside of cabinet is separated acoustically into a space that contains the acoustic transmission tube and a rear volume of the speaker unit, wherein the rear volume is a volume of the inner space of the cabinet excluding the acoustic transmission tube, wherein an outer surface of the cabinet includes the wall, wherein the cabinet includes a front panel, a rear panel, side panels disposed at both sides of the X-axis of the cabinet, side panels disposed at both sides of the Y-axis of the cabinet, a first cabinet portion that constitutes a front portion thereof and a second cabinet portion that constitutes a rear portion thereof, the speaker unit is attached to the wall, a part of a side wall of the acoustic transmission tube is a partition plate that has apertures which communicates with the inner space of the cabinet and a space in the acoustic transmission tube, the partition plate dividing the inside of the cabinet into a first space and a plurality of second spaces (A2 to A6), except in a portion in which the first space and the second spaces (A2 to A6) communicate with each other, wherein the apertures are made of a plurality of holes arranged along the direction in which the acoustic transmission tube extends, wherein the acoustic transmission tube has one tubular space in which said first space and said second spaces (A2 to A6) are serially connected, and wherein the tubular space has the open end and the closed end, and wherein the first space is elongated along the X-axis and the each of the second spaces (A2 to A6) are elongated along the Y-axis perpendicular to the X-axis, the side wall of the acoustic transmission tube is disposed so as to orthogonally intersect a lengthwise direction of standing waves occurring inside the cabinet.