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my woofer amps use 2 IC TDA2030 bridged together to produce greater output . i look this IC info in ECG. ECG says that this IC TDA0230 use +14volt, -14volt and ground and having an output power of 14 watts at 4 ohm speaker load, so if this IC is wired in bridged config. (BTL) the output power is more great than 2 IC wired as left and right channel