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d&b audiotechnik 21S SUB 21 Inch Passive Subwoofer Weather Resistant 100790026 USB or DVS – select Features Ideal for Professional USB or DVS – select your channel input and let the mix flow with 4 smooth gold plated contacts with deep threads to prevent misalignment and ensure extra long life The 21S SUB is a high performance subwoofer for use with the xS Series and xA Series loudspeakers and is intended for a wide range of permanently installed applications the 21S SUB can be used to complement other d&b subwoofers by extending the frequency response of the system down to 33Hz
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