MS-FR4021 MS-FR6021 MS-FR7021 Tweeter Type Titanium Dome Titanium Dome Titanium Dome Max Power (watts) 120 200 260 Efficiency (1W/1M) 87db 90db 91db Frequency Response 90 – 22kHz 70 – 22kHz 60 – 22kHz Min. Mounting Depth Allowing 54mm (2-1/8”) 71.
MS-FR4021 MS-FR6021 MS-FR7021 Sealed Enclosure Volume (cu.ft) 0.07 0.43 0.71 Sealed Enclosure Volume (litres) 2 12 20 Ported Enclosure Volume (cu.ft) .34 0.9 1.25 Ported Enclosure Volume (litres) 9.