Loading...YAMAHA
Stereo 31 -Band Graphic Equalizer
Egaliseur Graphique Stereo A31 Gandes
Graphischer 31 -Band-Stereo-Equalizer
QS031A
Operating Manual
Mode d’emploi
Bedienungsanleitung
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GRAPHICEQUALIZERfWNGE— |
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MODELQ2031A |
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You have made the right choice. The YAMAHA Q2031A Graphic Equalizer offers truly superior price/performance and is fully backed by YAMAHA’s wealth of accumulated sound expertise. Congratulations and thank you.
The versatile Q2031A enables you to add up to 12dB of boost or cut at any of 31 bands centered around International Standards Organization (ISO) 1 j3 octave frequencies from 20 Hz to 20 kHz. This versatility opens a wide range of applications in sound reinforce ment and recording. You can, for example, optimize gain to provide adequate feedback margins at all frequencies. You can also creatively shape frequency characteristics to match the particular room, studio, or hall and thus provide the realism and fidelity that critical audiences demand.
This manual has been written to help you obtain optimum performance and trouble-free operation from new Q2031A. Please read it throughly.
FEATURES
•This two-channel system offers completely independent channel control—from the input all the way to the output.
•The narrow, 1/3-octave bandwidth and 31-band control over the entire 20Hz to 20 kHz range provides very precise equalization.
•The Q2031A has been very carefully designed from both functional and operational perspectives. Each of the equalization sections, for example, has an independent EQ switch that bypasses the equalizer section, a High-Pass Filter with a slider-adjustable roll-off frequency, and a RANGE switch to select boost/cut ±6dB or ±12dB.
•The highly versatile Q2031A can be used in a wide variety of applications and can be mounted in a standard 19” rack.
• U.S. & Canadian models
Transformerless balanced (XLR Type connectors) or
unbalanced (1/4” phone jacks) |
inputs |
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are standard, with |
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for both input and |
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output transformer |
balancing. |
Two |
octal |
socket |
(CHANNEL A and B ) are provided on the rear panel. They will accept optional bridging input transformer BRT15K if desired. The output trans former should be installed by a qualified service technicians.
CONTENTS |
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FEATURES .................................................................................. |
1 |
SPECIFICATIONS........................................................................... |
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PRECAUTIONS................................................................................ |
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FRONT PANEL................ ............................................................... |
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REAR PANEL.................................................................................. |
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TYPICAL CONFIGURATIONS ........................................................ |
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ACOUSTIC CONTROL..................................................................... |
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BLOCK DIAGRAM ........................................................................ |
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DIMENSIONS.................................................................................. |
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SPECIFICATIONS
FREQUENCY RESPONSE |
0±0.5dB,20Hz~ 20kHz |
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TOTAL HARMONIC DISTORTION |
Less than 0.1% <a> +4dB, 20Hz |
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~20kHz |
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HUM & NOISE |
-96dB (LEVEL Control at |
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maximum and all Equalizer- |
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Controls at flat) |
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MAXIMUM VOLTAGE GAIN |
+24dB: |
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Input level sw at —20dB |
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Output level sw at -l-4dB |
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EQUALIZER CONTROLS |
31 band (1/3 octave) |
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/^Center Frequencies |
20, 25, 31.5, 40, 50, 63, 80,'^ |
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100, |
125, |
160, |
200, |
250, |
315, |
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400, 500, 630, 800, Ik, 1.25k, |
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1.6k, |
2k, |
2.5k, |
3.15k, |
4k, |
5k, |
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6.3k, |
8k, |
10k, |
12.5k, |
16k, |
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20kHz |
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Variable Range |
±12dB/±6dB |
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PEAK LED INDICATORS |
Light up when the output level |
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reaches 3dB below clipping. |
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INPUT SPECIFICATIONS
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HIGH PASS FILTER |
12dB/octave |
(Rolloff Frequency) |
(20Hz ~ 200Hz) |
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POWER REQUIREMENTS |
120V,AC60Hz |
U.S. & Canadian models |
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General model |
110/120/220/240V, AC50/60Hz |
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POWER CONSUMPTION |
25W |
U.S. & Canadian models |
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General model |
25W |
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DIMENSIONS (W X H X D) |
480 mm x 88 mm x 298 mm |
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(18-7/8" X 3-1/2" X 11-3/4") |
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WEIGHT |
4.8 kg (10.6 lbs.) |
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INPUT |
Input Source |
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(At Maximum Nniniiicil Coiim-i-fois' ■ |
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connertcs |
Impedance Impedance |
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Clipping |
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+4dB |
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+4dB (1.23V) |
-l-4dB (1.23V) |
-l-20dB (7.75V) |
XLR-3-31 Type |
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IMPI IT |
15k ohms |
600 ohm |
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B) _20dB |
LINES |
-20dB (77.5mV) |
-20dB (77.5mV) |
-4dB (489mV) |
Phone Jack |
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OUTPUT SPECIFICATIONS
OUTPUT |
OUTPUT |
Output |
Load |
Output Level |
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Connectors |
LEVEL |
Impedance |
Impedance |
Nominal Level |
Maximum Before |
Connectors* ‘ |
Switch |
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Clipping |
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600 ohm Lines |
-f4dB (1.23V) |
H-20dB (7.75V) |
XLR-3-32 Type |
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-4dB |
150 ohms |
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10k ohm Lines |
H-ISdB (6.16V) |
Phone Jack |
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OUTPUT (A, B) |
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600 ohm Lines |
-20dB (77.5mV) |
-4dB (489mV) |
XLR-3-32 Type |
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-20dB |
150 ohms |
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10k ohm Lines |
-6dB (388mV) |
Phone Jack |
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*The input level required to obtain the nominal output level.
** XL R-type connectors are balanced. Phone jacks are unbalanced.
OdB is referenced to 0.775V RMS. Specifications subject to change without notice.
PRECAUTIONS
•LOCATION
Do not install the Q2031A in location where it might be subjected to the following;
o Direct sunlight or excessive heat o Extreme coid
o High humidity or dust o Strong vibrations
•HANDLING
Do not apply undue force to the switches or controls.
•POWER CORD
Pull the power cord from the wall outlet by the plug only. Never pull on the cord as this may lead to breaking or shorting.
•CONNECTIONS
Turn off all equipment power switches before making any connections. Before moving the Q2031 A, disconnect cords to other equipment to avoid damaging connectors and cables.
•CABINET CLEANING AND CARE
Wipe the Q2031A cabinet clean with a soft, dry cloth. Do not clean it with benzene or other solvents and avoid spraying insecticides near it.
•LIGHTNING
If your area is prone to lightning strikes, unplug the Q2031A power cord during storms to prevent lightning induced transients on the power lines from damaging the equipment.
FRONT PANEL
O POWER switch
When this switch is pressed to turn power on, the POWER indicator LED will light. Pressing the switch again turns the power off.
Q RANGE switches
The RANGE switches select the filter boost or cut range for the respective channels. When the switches are off, the normal range of +/—12 dB is selected; when on, the +/—6 dB range is selected. This latter range is useful for very accurate equalization. When the Range switch is on, the LED indicator to its left lights to show that the +/—6dB range is in effect.
0HPF (High Pass Filter) switches
Each channel has an independent HPF switch to switch the HPF in or out of the audio path before the graphic equal izer section. With the HPF switch off, the input signal goes directly to the equalizer, bypassing the HPF.
When the HPF switch is on, the HPF is switched into the audio path and provides 12 dB per octave rolloff below the frequency set by the HPF frequency control © . LED in dicators associated with each switch light when the switch is on to show that the HPF is being used.
O EQ switch
When the EQ switch, provided for each channel, is off, the equalizer is bypassed. When the switch is on, its associated LED indicator lights, and the equalizer is switched into the audio path. The equalized signal can be compared with the un-equalized signal simply by alternately turning the EQ switch on and off.
O LEVEL controls
Individual LEVEL controls for both channels adjust the input sensitivity for optimum input level. When the LEVEL control is at the top of the scale, the input source signal level remains unchanged (+4 dB or —20 dB). As the LEVEL control is moved downward, the input level is reduced.
This control can be used restore the output level when the overall level has been changed during the equalization process. This, however, will also change the input level. Equalization methods which do not change the LEVEL control setting will yield a better signal-to noise ratio and wider dynamic range.
O HPF (High Pass Filter) controls
The HPF controls continuously adjust the rolloff frequency over the entire 20 Hz to 200 Hz range for their associated HPFs and channels. Below the selected frequency, there will be a 12 dB per octave rolloff.
The HPF can be adjusted to eliminate low-range standing waves that sometimes occur in indoor environments, control vocal “pops” and wind noise in microphones, and reduce AC hum.
O Equalizer Boost/Cut controls
The 20 Hz to 20 kHz spectrum is divided into thirty-one 1/3 octave bands, each of which has an equalizer boost/cut slider center (0) detected position. Moving the slider up boosts that band, moving it down cuts that band.
Convenient scales on either side of the sliders are calibrated in dB. The H-/—12 dB range is used when the RANGE switch is off. When the RANGE switch is on, the +/—6 dB range is used, and the true values are one-half of the calibrated values. Peak LED indicators on the right of the RANGE switches Q light when the output level reaches 3dB below clipping. If the PEAK indicators remain lit, you should reduce the over all settings of the equalizer sliders.
100 200 500 Ik
FREQUENCY (Hr)
To get the best performance from your 31-band Q2031A stereo graphic equalizer, it is important that you understand the frequency components that make up the sounds of each
musical instrument. The following graph is provided to |
aid |
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this understanding. You should also bear in |
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harmonics of fundemental frequencies, plotted |
as dotted |
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lines in the graph, can have a significant impact on timbre.
REAR PANEL
O INPUT Connectors
Both balanced (3-pin female XLR type connectors) and un balanced (1/4” phone jacks) input connectors are available. A 600 ohm line should be used for both. Use the INPUT LEVEL switch to set the rated input level to either +4 dB or -20 dB.
©INPUT LEVEL Switch
Use this switch to set the rated nominal input level to corre spond to the rated output level of the equipment to be connected.
0 OUTPUT Connectors
Both balanced (3-pin male XLR type connectors) and un balanced (1/4” phone jacks) output connectors are available. A 600 ohm lines should be used for the balanced XLR’s and a 10k ohm line for the unbalanced 1 /4” phone jacks. Use the OUTPUT LEVEL switch to set the rated nominal output level to either +4 or —20 dB.
©OUTPUT LEVEL Switch
Use this switch to set the rated nominal output level to correspond to the rated input level of the equipment to be connected.
U.S. & Canadian models only
©TRANSFORMER In/Out Switch
This switch inserts the optional (See item ©) Input Transformers into the input stage, bypassing internal electronic balancing.
©Input Transformer Octal Sockets
Two Octal Sockets are provided to accept optional 15k to 15k ohm bridging Input Transformers. (BRT15K)
©Internal Output Transformer (Optionals)
The Output Transformer should be installed by a quali fied service technicians.
TYPICAL CONFIGURATIONS
Insertion between the channel (master) insert out/in
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MIXING CONSOLE |
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02031A |
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INSERT OUT |
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CH A INPUT |
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OUTPUT |
INSERT IN |
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CH A OUTPUT |
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L R |
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SPEAKERS |
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POWER AMPS |
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Insertion in the main line of the output system |
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SPEAKERS |
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POWER AMPS |
MIXING CONSOLE |
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Q2031A |
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OUTPUT L |
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CH A |
CH A |
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INPUT |
OUTPUT |
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OUTPUT R |
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CH B |
CH B |
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INPUT |
OUTPUT |
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