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A useful alternative to overlong ports, passive radiators like the Peerless by Tymphany 830878 offer designers a well-proven method of extending and enhancing bass response
Peerless by Tymphany SDS-P830878 3-1/2" Passive Radiator
This 4 inch member of the SDS family is a passive radiator, designed to match up with SDS subwoofers, and features a coated paper cone with rubber surround, and a narrow-profile steel basket shaped to fit into narrow cabinets.