The Radius 270 houses a precision-crafted Radius driver system of twin 100 mm (4") C-CAM mid/bass drivers and a 25 mm (1") C-CAM tweeter. Pair with the 225 or 200 for scintillating home theatre audio, or with the 380/390 sub in a discreet two-channel system. Frequency Response 50 Hz — 35 kHz Sensitivity (1W@1M) 87 dB Nominal Impedance 6 ohms Power Handling (RMS) 100 W System Power Handling (RMS) 150 W Recommended Amplifier Requirements 40 — 150 W Maximum SPL 107 dBa Bass Alignment Bass reflex - Front and rear ported Drive Unit Complement 2 x 4" (100 mm) C-CAM cone bass/mid driver 1 x 1" (25 mm) C-CAM Gold Dome tweeter