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The 132141B 8 Ohm 4" Paper Cone Speaker is a great replacement option for indoor intercoms or vintage radios. A large ferrite magnet has ample strength to drive the 1/2" diameter copper voice coil. A ribbed one-piece paper cone and treated surround make for smooth response and higher than average efficiency. A unique square frame with several mounting options make this a great choice as a replacement speaker or a cost effective option for a custom build.