An audio loudspeaker system for reproducing frequencies between 16Hz and 700Hz, comprising a loudspeaker housing (12, 14) defining an inner resonance chamber and at least two loudspeaker drivers arranged in said housing and having front faces arranged facing each other in an opposed manner, said housing comprising vertical first and second opposed and parallel wall elements; arranged with a distance approximately defining a width of said resonance chamber, where each wall element comprises first and second side surfaces and a circumferential edge surface, where part of said circumferential edge surfaces defines an upper edge surface, a lower edge surface, a front edge surface facing a front of said loudspeaker system, and a rear edge surface facing a rear of said loudspeaker system, said first side surface of said first and said second opposed wall elements constituting an inner surface of said housing and partly defining an enclosure of said resonance chamber, and said second side surfaces of said first and said second wall elements constituting a first and second exterior side surface of said audio loudspeaker system, said housing further comprising a frame structure peing arranged between said first and second wall elements and at a peripheral circumference thereof, said frame structure partly defining an enclosure of said resonance chamber, said loudspeaker drivers being arranged on said second side surfaces of said first and said second wall elements, respectively, and said front faces of said loudspeaker drivers facing said resonance chamber and facing each other, said opposed loudspeaker drivers each further comprising a substantially hemispherical cup arranged on said second side surfaces of said first and said second wall elements, and enclosing said loudspeaker drivers in a close manner. said housing comprising vertical first and second opposed and parallel wall elements; arranged with a distance approximately defining a width of said resonance chamber, where each wall element comprises first and second side surfaces and a circumferential edge surface, where part of said circumferential edge surfaces defines an upper edge surface, a lower edge surface, a front edge surface facing a front of said loudspeaker system, and a rear edge surface facing a rear of said loudspeaker system, said first side surface of said first and said second opposed wall elements constituting an inner surface of said housing and partly defining an enclosure of said resonance chamber, and said second side surfaces of said first and said second wall elements constituting a first and second exterior side surface of said audio loudspeaker system, said housing further comprising a frame structure peing arranged between said first and second wall elements and at a peripheral circumference thereof, said frame structure partly defining an enclosure of said resonance chamber, said loudspeaker drivers being arranged on said second side surfaces of said first and said second wall elements, respectively, and said front faces of said loudspeaker drivers facing said resonance chamber and facing each other, said opposed loudspeaker drivers each further comprising a substantially hemispherical cup arranged on said second side surfaces of said first and said second wall elements, and enclosing said loudspeaker drivers in a close manner.