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• The Parametric
Parametric
Parametric Equalizer
Parametric
Equalizer
Equalizer is a single stage PEQ filter with gain
Equalizer
(1...8) controls designed to control nonlinearities seen below 120 Hz – see graph above. These nonlinearities
can come from boosts caused by constructive interference or strong room modes. It is possible to bypass the
parametric equalizer using the bypass
• The Subwoofer Phase
Subwoofer Phase controls consist of a 0° 0° 0° 0° / - - - - 180°
Subwoofer Phase
Subwoofer Phase
very short delay (45° at 80 Hz = 1.56 ms) to the subwoofer output, and gives a positional resolution of 0.54
m (1' 9"). These controls are used to acoustically realign the subwoofer with the main loudspeakers when
they are positioned at different distances from the listening position.
• The subwoofer's output level is controlled using the Subwoofer Gain
graduated Input Gain
Input Gain (+2 to -12 dB) potentiometer and a coarse Output Level
Input Gain
Input Gain
switch. This allows the subwoofer to be matched to a wide range of equipment outputs whilst maintaining
the desired acoustical output. It can also compensate for level differences due to acoustical loading and the
distance of the subwoofer from the listening position compared to the main loudspeakers. The default
settings are "0 dB" and "100 dB SPL at 1m". This gives an output level of 100 dB SPL at 1m when the input
signal is 0 dBu (0.775 V). The most sensitive setting (most acoustical output for a given input voltage) is "2
dB" and "114 dB SPL at 1m", and the least sensitive setting is "-12 dB" and "100 dB SPL at 1m".
Input Gain
Input Gain
Input Gain
Input Gain
Potentiometer [dB]
Potentiometer [dB]
Potentiometer [dB]
Potentiometer [dB]
-12 dB
-10 dB
-8 dB
-6 dB
-4 dB
-2 dB
0 dB
2 dB
Below are some examples of how to calculate the output level:
Input signal [dBu]
Input gain setting [dB]
Output level setting [dB SPL]
Sound Output of Loudspeaker
[dB SPL at 1m]
In Europe, 0 dBu is -18 dBFS (EBU standard R68). In the US, +4 dBu is -20 dBFS (SMPTE standard RP155).
These dBu values should equate to 85 dB SPL at the listening position. It is typical in the broadcast industry
to use a reference level of 79 dB SPL at the listening position. Near field loudspeakers can be as close as 1 m
from the listening position, whereas loudspeakers in a Dolby certified movie mixing room should be at least 5
m from the listening position. In the examples below, it is assumed that the listener is inside the room radius
and thus the sound field decays according to 20 log
Input signal [dBu]
Input level setting [dB]
Output level setting [dB SPL]
Listening distance [m] (dB change)
Loudspeaker Output Level [dB SPL]
Maximum input signal before clipping
The maximum input level that the input stage can accept is +17 dBu (5.5 V).
Calibrating the Acoustical Controls
Calibrating the Acoustical Controls
Calibrating the Acoustical Controls
Calibrating the Acoustical Controls
Calibrating Main Loudspeakers
Calibrating Main Loudspeakers
Calibrating Main Loudspeakers
Calibrating Main Loudspeakers
Firstly, calibrate each main loudspeaker's response (preferably using an acoustical measurement system) to the
one of the following target responses:
O 810 / O 870 Operating Manual
All manuals and user guides at all-guides.com
bypass switch.
bypass
bypass
180°
180° switch and 0° 0° 0° 0° / - - - - 45°
180°
Subwoofer Gain controls. This consist of a finely
Subwoofer Gain
Subwoofer Gain
Acoustic output level [dB SPL] of the loudspeaker at 1m
Acoustic output level [dB SPL] of the loudspeaker at 1m
Acoustic output level [dB SPL] of the loudspeaker at 1m
Acoustic output level [dB SPL] of the loudspeaker at 1m
when input signal is 0 dBu
when input signal is 0 dBu
when input signal is 0 dBu
when input signal is 0 dBu
Output Level switch = "100 dB"
Output Level switch = "100 dB"
Output Level switch = "100 dB"
Output Level switch = "100 dB"
88
90
92
94
96
98
100 (default)
102
0 (0.775 V)
0
100
100
10
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gain (+4...-12 dB), frequency
gain
gain
frequency
frequency
frequency (20...120 Hz) and Q Q Q Q
45°
45°
45° / - - - - 90°
90°
90°
90° / - - - - 135°
Output Level (100 or 114 dB SPL at 1 m)
Output Level
Output Level
Output Level switch = "114 dB"
Output Level switch = "114 dB"
Output Level switch = "114 dB"
Output Level switch = "114 dB"
102
104
106
108
110
112
114
116
+4 (1.23 V)
+6 (1.55 V)
0
0
100
100
104
106
(r), however this may not always be the case.
0 (0.775 V)
+4 (1.23 V)
-1
100
100
5 m (-14 dB)
5 m (-14 dB)
85
85
17 dBu
17 dBu
Klein + Hummel
135° switch. This applies a
135°
135°
+16 (4.89 V)
0
100
116
-5
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