Era Design 4 Speaker System, AudioControl Maestro M2 Pre/Pro, and AudioControl Savoy Amplifier HT Labs Measures: Era Design 4 Speaker System
Satellite Sensitivity: 82.5 dB from 500 Hz to 2 kHz
Center Sensitivity: 87 dB from 500 Hz to 2 kHz
This graph shows the quasi-anechoic (employing close-miking of all woofers) frequency response of the Design 4 satellite (purple trace), Sub 10 subwoofer (blue trace), and Design 4 LCR center channel (green trace). All passive loudspeakers were measured with grilles at a distance of 1 meter with a 2.83-volt input and scaled for display purposes.
The Design 4's listening-window response (a five-point average of axial and +/–15-degree horizontal and vertical responses) measures +1.73/–2.44 decibels from 200 hertz to 10 kilohertz. The –3-dB point is at 90 Hz, and the –6-dB point is at 72 Hz. Impedance reaches a minimum of 6.73 ohms at 203 Hz and a phase angle of –57.21 degrees at 120 Hz.
The Design 4 LCR's listening-window response measures +2.04/–1.86 dB from 200 Hz to 10 kHz. An average of axial and +/–15-degree horizontal responses measures +1.96/–2.82 dB from 200 Hz to 10 kHz. The –3-dB point is at 88 Hz, and the –6-dB point is at 69 Hz. Impedance reaches a minimum of 4.48 ohms at 244 Hz and a phase angle of –55.21 degrees at 136 Hz.
The Sub 10's close-miked response, normalized to the level at 80 Hz, indicates that the lower –3-dB point is at 29 Hz and the –6-dB point is at 25 Hz. The upper –3-dB point is at 104 Hz with the low-pass switch set to off and the EQ switch set to on.—MJP