YAMAHA Q1027 user manual
Contents
1. 2 FRONT PANEL OPERATION 3 CONNECTION BLOCK DIAGRAM 4 REAR PANEL OPERATION 5 6 MOUNTING THE SECURITY COVER SPECIFICATIONS 7 CAUTION Locate the Q1027 out of the direct rays of the sun avoiding locations subject to vibration and excessive dust heat cold or moisture When displacing the instruments be sure to disconnect the power supply cord and every connecting cord to prevent their breakage and short eDo not attempt to clean any accumulations of dirt with chemical solvents such as alcohol or benzene Wipe only with a clean completely dry cloth Keep this manual in a safe place for future reference and refer to it frequently until you are fully familiar with your Q1027 e This model is designed to be mounted on 19 standard rack e Voltage Selector switch on the rear of the O1027 must be set for your local mains voltage BEFORE plugging in the AC main supply Voltages are 110 130 or 220 240AC 50 60Hz U S and Canadian models are not provided with the voltage selector FRONT PANEL OPERATION RENI POWER switch When this switch is depressed to the ON position the power is supplied to the equalizer and the indicator lights Depress the switch again to set it to the OFF position2. A era ATT INPUT d i g Z ET 40Hz 800Hz 6 se gt L 27 BANO ON o OFF PIN 1 GND SW OFF o FUSE LED REAR PANEL OPERATION O YAMAHA SER NO PATENI PENDING OUTPUT O Cannon socket XLR 3 32 It is provided with a Cannon socket for balanced output The Q1027 employs a 3 pin pin 1 shielded ground pin applications and a phone jack for unbalanced output 2 hot pin 3 cold socket for connection applications The output impedance in either case is 40 Compatible plugs include the Cannon XLR 3 11C and ohms the Switchcraft A 3 F The phone jack output takes priority when both the Cannon socket and phone jack are connected Cannon socket XLR 3 31 simultaneously Compatible plugs include the Cannon XLR 3 12C and the Switchcraft A 3 M OUTPUT PHASE switch This switch selects the phase of the balanced output Set Phone jacks to the N side to match the phases of the input and These employ standard plugs output and to the R side for reverse phase The switch is used for phase alignment when many O Fuse components have been connected or when the phase Always use a fuse with the same ratings of the existing changes in accordance with the setting position of the one for replacement purposes speaker system The phase of the phone jack side cannot be selected O VOLTAGE
3. a pink noise generator and a real time analyzer must be provided as measuring instruments Connect the pink noise generator to the PA console mixer and the pink noise is then heard through the speaker Use the real time analyzer in the service area to measure this noise and adjust the controls on the graphic equalizer so that the indicated transmission response is made flat SPEAKER REAL TIME ANALYZER analyzer to the auxiliary output and then increase the gain Use the controls on the graphic equalizer to adjust the gain of the frequency where the howl is generated and if as a result howl is generated at almost every frequency when the gain is increased it means that the problem of the howl at the original frequency has been resolved SPEAKER With compensation using only measuring instruments the sound is sometimes found to be lacking and after performing equalizing from the twin aspects of the indoor transmission response and howl check the sound quality and level balance in the service area by ear and perform overall adjustment MOUNTING THE SECURITY COVER SPECIFICATIONS Mounting the security cover If the control knobs on the equalizer once set are moved by mistake or carelessly when the model is being used in one location only the controls have to be re adjusted To prevent this kind of trouble a security cover is provided as an accessory to this model Remove the four setscrews of the front panel a
4. switch isolates the equalizer section and passes the input signals to the output When the knob is set to IN the indicator light to indicate that the equalizer section is now working When it is set to OUT the indicator goes off and the input signals bypass the INPUT ATT contro and the equalizer section and they are sent straight to the output In cases like this the Q1027 functions as a buffer amplifier and the EQ switch is used to compare the sound quality with and without equalizing INPUT T oyr OUTPUT QHPF high pass filter switch This filter has a slope response of 18 dB oct and its switch allows selection between a cutoff frequency of 40Hz and 80Hz At the 40 position signals with a frequency of less than 40Hz are attenuated and it is possible to suppress the low frequency standing waves low frequency resonance produced in studios and small rooms to eliminate the muddiness in the low range and to obtain a clear cut sound At the 80 position signals with a frequency of less than 80Hz are attenuated and it is possible to reduce the fuzziness of vocal microphones and the hum and noise of electrical musical instruments etc The indicator light when the switch is set to the 40 and 80 position FREQUENCY RESPONSE Indicator CONNECTION BLOCK DIAGRAM CONNECTION MIXER PRE AMPLIFIER SOURCE SPEAKER BLOCK DIAGRAM 9
5. x 318 x 95 5 mm 18 7 8 x 12 1 2 x 3 3 4 Weight 8 kg 17 6 Ibs Measured with 6 dB oct filter 12 47kHz equivalent to a 20kHz filter with infinite dB oct attenuation OdB is referenced to 0 775 V r m s Specifications subject to change without notice NIPPON GAKKI CO LED HAMAMAT SH JAPAN L jomp 10 821005 FF VEIOUR _e A Ee SOE o Printed E uy Japan
6. Between three and five seconds after the switch has been set to ON the muting circuit is activated in order to suppress the pop noise produced when the power is initially supplied and there are no output signals O Equalizer section Available in this section are the control knobs which are used to increase or reduce the center frequency level of the frequencies in the audible band which is divided into 27 parts Based on a reference value of O dB the level may be varied up to a maximum of 12 dB To set the level align the red line of the knob with the setting scale Red line E El E El El EJ E RESPONSE 48 RESPONSE dB FREQUENCY Hz O PEAK indicator This lights when the output level exceeds 21 dB and it warns that the output level is excessively high OINPUT Attenuator This is used to adjust the input level When rotated in the counterclockwise direction it is possible to attenu ate the level in 1 dB steps down to 20 dB At the co position the input signals are cut off entirely and there is no sound When the overall level has risen due to equalizing take steps to turn down the input level by a value equivalent to the rise in the level and eliminate the difference in level caused by the presence or absence of equalizing The attenuator does not work when the EQ switch is set to the OUT position O EO equalizer bypass switch This
7. SELECTOR General Models Only Set this to your local AC mains voltage Failure to do so INPUT will result in seriously impaired performance or even It is provided with a Cannon socket for balanced input severe damage applications and a phone jack for unbalanced input applications The input impedance is 8 kiloohms for the balanced input and 10 kiloohms for the unbalanced input The phone jack input takes priority when both the Cannon socket and phone jack are connected simultaneously OPIN 1 GND switch This switch sets the balanced output ground line pin 1 shielded ground to ON and OFF Hum or noise is sometimes caused by the illumination inside the hall and the high power components when signal cables are used extendedly or when they are used in a certain placement to connect a number of compo nents This noise can sometimes be reduced by isolating the ground line In a case like this use this switch EQUALIZING This model divides the audible frequency 40Hz 16kHz by 1 3 octaves into 27 portions to enable extremely intricate compensation Equalizing can be provided from the twin aspects of indoor transmission response and howl and it is possible to improve the sound quality at the audience seats by making the indoor transmission response flat and also tc provide a sufficient howl respite for microphones used on the stage e Equalizing for correct indoor response The frequency response curves and specifications provi
8. YAMAHA PROFESSIONAL SERIES GRAPHIC EQUALIZER Q1027 OWNER S MANUAL o MR nu m Er id M FEATURES CAUTION The Q1027 is a professional grade 27 band graphic equalizer that offers top quality performance features reliability and durability It is perfectly suited to a wide range of professional applications including concert sound reinforcement and studio recording Please be sure to read this operation manual carefully in order to make the most of your Q1027 s extensive perform ance capabilities FEATURES inputs and outputs feature Phase Switches Ground Switches and cannon connectors Rack mountable configuration Rugged to withstand the rigors of profes sional use Human engineered control layout for fast error free operation Elegant styling Exceptionally high S N ratio and low distortion 27 1 3 octave equalizer bands provide extremely fine control capability Unique L integrated circuit construction effectively minimizes inductive noise pick up maintaining excellent signal to noise ratio and low distortion Equalizer bypass switch 40 80 Hz high pass filter selector accurate input attenuator and peak level indica tor all add up to more convenient more precise sound control Removable security cover prevents accidental alteration of settings in studio and sound reinforcement applications Designed for optimum in use flexibility and performance CONTENTS
9. ded with speaker units and systems are derived from measurements taken in an anechoic chamber an acoustically dead room in which no reflection of sound takes place When used in a real listening environment such as a hall or club however the actual percieved response is highly dependent on the acoustic properties of the listening area Hard surfaces such as windows wood panelling and tile floors can reflect the high frequencies causing a tinny or ringing sound while curtains chairs and even people can absorb high frequencies causing a flat or muddy response It is therefore essential that the sound reinforcement system be properly equalized to compensate for the PINK NOISE GENERATOR e Equalizing to combat howl Depending on the acoustics of a hall or room howl is sometimes heard at a specific frequency In a case like this howl can be prevented by reducing the gain only for that frequency where the howl is generated For accurate equalizing a pink noise generator and a real time analyzer are useful Set the microphone on the stage connect the pink noise generator to the auxiliary input of the PA console mixer and the real time REAL TIME ANALYZER PINK NOISE GENERATOR specific acoustic conditions in the area where it is to be used In order to improve the sound quality at the listening position it is necessary to perform equalizing of the indoor transmission response For this kind of equalizing
10. nd then mount the cover using the mounting screws Setscrews Setscrews n E oui Wie an I a e deii ell o 3 Front panel Mounting Screw Security cover 1 Remove the setscrews of the 2 Mount the accessory cover 3 Mount the security cover in front panel mounting screws in place of line with the mounting screws the front panel s setscrews SPECIFICATIONS Frequency Response PHONE JACK 20Hz 20kHz 0 0 5dB XLR 20Hz 20kHz 0 1 5dB Total Harmonic Distortion PHONE JACK less than 0 02 20Hz 20kHz XLR less than 0 5 20Hz 20kHz Hum amp Noise 100dB EQ flat 600 2 load Gain OdB EQ by pass Maximum Output Level 24dB 600 load Center Frequencies 40 50 63 80 100 125 160 200 250 315 400 500 630 800 1k 1 25k 1 6k 2k 2 5k 3 15k 4k 5k 6 3k 8k 10k 12 5k 16k Hz Frequency Accuracy Less than 5 Range of Boost Cut Boost 0 12dB Cut 0 12dB High Pass Filter 18dB oct 40Hz 10 80Hz 10 Input Impedance PHONE JACK 10kX2 unbalanced XLR 8kQ balanced Output Impedance PHONE JACK 40 Q unbalanced XLR 40 Q balanced Power Source U S amp Canadian Models 120V AC 60Hz General Models 110 130 or 220 240AC Selectable 50 60Hz Power Consumption U S Model 18W Canadian Model 24VA General Models 20W Dimensions W x D x H 480 x 305 x 95 5 mm 18 7 8 x 12 x 3 3 4 When security cover mounted 480
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YAMAHA Q1027 user manual