Power handling ( RMS ): 130W Power handling ( Max ): 200W Impedance: 3 Ohm Frequency response: 35 Hz- 25 kHz Cut-off frequency 4300 Hz (6/12 dB /oct) High pass filter settings: -2dB / 0dB / +2dB Midwoofer/Tweeter Effiency: 90 dB GZRK 165SQ outer diameter: 165mm GZRK 165SQ mounting cutout: 142.5mm GZRK 165SQ mounting depth: 68mm GZRT 28SE outer diameter: 54mm GZRT 28SE mounting cutout: 48mm GZRT 28SE mounting depth: 18mm.