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Test & measurement
SB Acoustics SB12MNRX25-4 4" Midrange Woofer
SB Acoustics Midrange Woofer is an excellent SB Acoustics Ferrite magnet midrange/midwoofer, featuring a high efficiency foam surround. Fitted with a proprietary composition paper cone, 1" voice coil. Very open cast frame for minimal reflections. Fs 61Hz, good level extended response up to 5KHz.