Vienna Acoustics Beethoven Baby Grand Speaker System, REL R-305 Subwoofer, and Optoma HD72 DLP Projector HT Labs Measures: Vienna Acoustics & REL
L/R Sensitivity: 88.0 dB from 500 Hz to 2 kHz
Center Sensitivity: 89.5 dB from 500 Hz to 2 kHz
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 Beethoven Baby Grand L/R (purple trace), REL R-305 subwoofer (blue trace), Maestro Grand center channel (green trace), and Bach Grand surround (red 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 Beethoven Baby Grand's listening-window response (a five-point average of axial and +/–15-degree horizontal and vertical responses) measures +3.19/
–6.97 decibels from 200 hertz to 10 kilohertz. The –3-dB point is at 36 Hz, and the –6-dB point is at 30 Hz. Impedance reaches a minimum of 2.98 ohms at 94 Hz and a phase angle of –33.95 degrees at 4.6 kHz.
The Maestro Grand's listening-window response measures +1.73/–7.04 dB from 200 Hz to 10 kHz. An average of axial and +/–15-degree horizontal responses measures +2.26/–6.88 dB from 200 Hz to 10 kHz. The –3-dB point is at 53 Hz, and the –6-dB point is at 42 Hz. Impedance reaches a minimum of 4.29 ohms at 197 Hz and a phase angle of –42.93 degrees at 3.7 kHz.
The Bach Grand's listening-window response measures +1.53/–7.67 dB from 200 Hz to 10 kHz. The –3-dB point is at 39 Hz, and the –6-dB point is at 34 Hz. Impedance reaches a minimum of 4.94 ohms at 148 Hz and a phase angle of –49.85 degrees at 3.6 kHz.
The REL R-305's close-miked response, normalized to the level at 40 Hz, indicates that the lower –3-dB point is at 25 Hz and the –6-dB point is at 20 Hz. The upper –3-dB point is at 66 Hz with the LFE input. Note that, due to the incorrect high-frequency rolloff using the LFE input, I was unable to reference the frequency response to our usual 80 Hz as the response is already –7 dB at that point.—MJP