4 Ohm 12in driver for QR12a (178.204UK)A range of chassis speakers to replace the main driver in the QTX Sound QR series active cabinets.Vented magnetsSpade terminalsPower max. - 400WPower rms - 200WMagnet weight - 1.134kg (40oz)Magnet size - 20 x 140mmDiameter - 30cm (12)Voice coil - 52mm (2)Freque