6-1/2" of folded horn chamber length in the speaker cabinetThunderous bass frequency extension similar to a 36" driverRugged cast aluminum C-Series door has improved heat dissipation capabilitiesRounded horn mouth creates smoother frequency responseAcoustic impedance balancing reduces cone rocking and distortionSteel front-corner bracing to improve cabinet strengthRedesigned durable multi-ply constructionAn extra-deep, reinforced pole cup that keeps pole-mounted speakers stableIntegrated wheels