d&b audiotechnik 21S SUB 21 Inch Passive Subwoofer Weather Resistant 100042465 Output Impedance: 400 Custom TAB Funkenwerk AMI Output Impedance: 400 The four 12G specially shaped reflex port enables the 21S SUB to achieve high Sound Pressure Levels from a cabinet with a small footprint Depth: 20 11 16″
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