QTX Subwoofer Filters - filter, 12dB, 120Hz, 4 Ohms, 600W. Passive 4 ohms subwoofer filters for use in Hi-Fi and PA loudspeaker systems. Packed Quantity: 1 per pack. Dimensions: 5.10cm x 5.10cm x 9.30cm. Weight: 0.39kg. Crossover frequency: 120Hz. Damping factor: 12dB/oct. Connections by solder terminals. Power peak: 600W. Power RMS: 320W.