I have the 52-Z's. I don't know the X-over designation other than Z. The site says 480 but I have the Z option //content.invisioncic.com/y282845/emoticons/eyebrow.gif.fe2c18d8720fe8c7eaed347b21ea05a5.gif I have the 1" tweets.
5.25" 2-Way
Midrange: 5.25" Cast
Crossover: SatNet-480 24dB "Phase Perfect" Elliptic 4th order 2-way
Tweeter: DRT-25 extended range 1” silk
Power Handling: 180 watt RMS @ 100Hz High Pass
Frequency Response: 65-20kHz
Sensitivity: 91.8 dB
Impedance: 4Ohm
Surface & Flush mount swivel tweeter