Tower Speaker Reviews

• Radia 520i L/R Sensitivity: 86 dB from 500 Hz to 2 kHz

• Radia 220i Center Sensitivity: 88 dB from 500 Hz to 2 kHz

• Radia 420i Surround Sensitivity: 86.5 dB from 500 Hz to 2 kHz

This graph shows the quasi-anechoic (employing close-miking of all woofers) frequency response of the Radia 520i L/R (purple trace), Radia 210i subwoofer (blue trace), Radia 220i center channel (green trace), and Radia 420i surround (red trace). All passive loudspeakers were measured at a distance of 1 meter with a 2.83-volt input and scaled for display purposes.

The Radia 520i's listening-window response (a five-point average of axial and +/–15-degree horizontal and vertical responses) measures +2.04/–8.38 dB from 200 Hz to 10 kHz. The –3dB point is at 93 Hz, and the –6dB point is at 81 Hz. Impedance reaches a minimum of 2.96 ohms at 162 Hz and a phase angle of –58.63 degrees at 111 Hz.

The Radia 220i's listening-window response measures +1.31/–4.56 dB from 200 Hz to 10 kHz. An average of axial and +/–15-degree horizontal responses measures +1.21/–5.77 dB from 200 Hz to 10 kHz. The –3dB point is at 77 Hz, and the –6dB point is at 59 Hz. Impedance reaches a minimum of 3.22 ohms at 141 Hz and a phase angle of –58.55 degrees at 84 Hz.

The Radia 420i's listening-window response measures +2.04/–5.37 dB from 200 Hz to 10 kHz. The –3dB point is at 94 Hz, and the –6dB point is at 81 Hz. Impedance reaches a minimum of 4.64 ohms at 162 Hz and a phase angle of –40.04 degrees at 114 Hz.

The 210i's close-miked response, normalized to the level at 80 Hz, indicates that the lower –3dB point is at 39 Hz and the –6dB point is at 29 Hz. The upper –3dB point is at 111 Hz with the crossover control set to maximum.—MJP