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21inch active speaker box,
HD21BP is enclosure constructed of 25mm high-density piywood
covered with coated in high-strong/wearable black pocked lacquer.
Single 21" subwoofer:aluminum basket,
5"high-temp black oxidizing aluminum foil voice coil,cloth edge and non-pressed paper+glass fiber cone
21" symmetrical motor woofer for extended low-frequency outputLarge port area for reduced distortion35mm pole socket for solid,secure satellite speaker mounting ,
Voitage:110-230V,AC:60-50Hz,
Rmspower:2200watts,
Impedance:8ohms,
Sensitivity:106dB/m/w,
Speaial function:USB/SD/fm audio and LCD screen