TOA Electronics 1000 Series Network Card User Manual
Contents
1. BPF Note 0 dB is referenced to 0 775 volts RMS Specifications are subject to change without notice Accessories Security oo 1 Fuse ee eee re ee eee eee ee eee eee ree re ee rs 1 Screw for security ole gt 2 Warranty card for USA and Canada 4444444 1 Short piece Meenesshbeeecseoosvsteseceesoreseseesesevicesesevesece 2 Operating instructions ehaevsevoeseeeveeesesssioseveeeseceoocec 1 419 65 E t mc H 482 6 19 0 M 88 4 3 48 466 18 35 4 SI mm inch ZA Corporation _12 Printed Japan 133 12 037 2A2. 039 LNIOd 3 3 Lndino 2 LAdNI H SNYUL NOILdO WYHOVIG 52018 1 21 3 cA W Specifications Frequency Response 1dB 20Hz to 20kHz Total Harmonic Distortion Less than 0 01 at 1 kHz all sliders at O position rated output Equalization Center Frequencies 31 5Hz to 16kHz 31 5Hz 40Hz 50Hz 63Hz 80Hz 100Hz 125Hz 160Hz 200Hz 250Hz 315Hz 400Hz 500Hz 630Hz 800Hz 1kHz 1 25kHz 1 6kHz 2kHz 2 5kHz 3 15kHz 4kHz 5kHz 6 3kHz 8kHz 10kHz 12 5kHz 16kHz Rated Input Level 4dB INPUT LEVEL CONTROL set for 0 position Rated Output Level 4dB with 600 ohm load Maximum Input Level 20dB at 1kHz Maximum Output Level 20dB with 600 ohm load Input Impedance 10k ohms Output Impedance 600 ohms Hum and Noise 94dB EQ in all sliders at 0 position 20 20kHz Indicators A red LED for output and input clipping A green LED for equalizer IN A green LED for power ON A green LED for filter IN Controls Equalizer Sliders 12dB Input Level Control 12dB Highpass Filter 12dB per octave Adjustable Cutoff Frequency 15Hz to 300Hz Lowpass Filter 12dB per octave 6dB per octave Adjustable Cutoff Frequency 2 5kHz to 30kHz AC Line Voltage AC mains 50Hz 60Hz Power Consumption 11 watts Finish Black Dimensions W X H x D 483 x 88 x 317mm 19 0 x 3 5 x 12 5 Weight 4 5kg 9 9lbs
3. IB 100 125 160 200 250 315 400 500 630 800 tk 125 16k 2k 25 315k Sk 63k Bk 10k 125 16k E IBooc v The overall response after equalization will then be as follows Before equalization Frequency response of equalizer Frequency response after equalization Sound Pressure Level 31 5 63 125 250 500 ik 2k 4k 8k Frequency Ee Applications Equalization for music The Graphic Equalizer is designed not only for use in preventing feedback and equalizing uneven room frequency response to be flat but also for equalizing frequency response to your tastes and producing favorable sound for you Fig 1 shows each frequency band and its corresponding auditory feeling Fig 2 and Table 1 show the relation between each musical instrument and its frequency band They can be of great help in the equalizer operation They are referenced from a book entitled Practical Guide for concert EQUALIZATION CHART 20Hz 150 300 2k 15k 5k 10k NNN TLL LLL LLL LT TOT These sounds rhythm sec Probably the most im Upper vocal region Presence range are felt more tion appears portant of all Most all Too much here will Great achievement levels can be than really here Either fat instruments contain cause great fatigue in overall level controlled heard They
4. TO Operating Instructions NN GRAPHIC EQUALIZER E 1231 TOA 1000 series THE LIGHTNING FLASH WITH CAUTION ARROWHEAD WITHIN A TRIANGLE IS mer NOY OPEN INTENDED TO TELL THE USER THAT PARTS INSIDE THE PRODUCT ARE A CAUTION RISK ELECTRIC SHOCK TO REDUCE THE RISK OF ELECTRICAL PERSONS SHOCK DO NOT REMOVE COVER NO USER SERVICEABLE PARTS INSIDE THE EXCLAMATION POINT WITHIN A judo TRIANGLE IS INTENDED TELL THE SERVICE PERSONNEL USER THAT IMPORTANT OPERATING AND SERVICING INSTRUCTIONS ARE IN THE PAPERS WITH THE APPLIANCE Please follow the instructions in this manual to obtain the optimum results from this unit We also recommend that you keep this manual handy for future reference Corporation W Contents Cautions Vue Whi E I RUE ERU EUR St we Fave Ei Oris e RS Rer oq wile P E 2 General Description eei ere ER ER EAS aw ead ene C Sue WE Wie ues 6 ONE EC DUREE 3 d TED z A E EE E E E ea P Optional Matching Transformer Mounting EP dada e RE YEA ee 9 Performance Graphs diete es ere esae 8 Rn qi 8 TE e COD S ne 10 M e
5. thin sound harmonics here 300 Hz and loose speech in be had here Too here Bright give a sense can be heard by boosting can cause horn telligence Reducing little causes a far clean defini of power mis EQ here Too like sounds 1 k to 2 k 3 can bring vocals away sound tion Too much much becomes sounds tinny Too much on top produces boomy Bass gui here sounds like the tel muddy sound tar Snare Toms ephone Fig 1 INSTRUMENT CHART INSTRUMENT EQUALIZATION CHART Table 1 Acoustic guitar 16 31 5 63 125 250 500 1k 2k 4k 8k 16k Bass strings resonate between 70 to 120Hz body around 300Hz Avoid boosting these to stop feedback 3kHz and 5kHz gives great clarity Electric guitar Resonances differ depending on type Good full sounds around 300 to 500Hz Clarity at 3kHz Bass guitar Extreme lows are at 60 to 90Hz Pick or pluck sounds are around 800 to 1200Hz Upper harmonics clarified about 3kHz Human voice Good fullness at 150Hz Watch for boominess around 250Hz Mid range 10kHz Piano Acoustic Bass strings responate around 100Hz Watch for subharmonics at 30 to 50Hz Piano Electric Good mid clarity at 3kHz to 5kHz thins out rapidly in high end Be careful around 1 5kHz to 2 5kHz to avoid the bar room sound Organ Usually dies under 200Hz Has great mid sounds around 1200 to 2000Hz Top end cuts off at 6kHz Violin Richfullness at 400Hz Natural mids around 1500 to 2500Hz Avoid scratch sounds at 8kHz
6. ohms in input impedance Place the supplied short piece between E and C to convert to unbalanced type llinput Output Connections Input terminal from mixer etc Usum 1 b Power Amplifier ZOL Speaker System e Installation Precautions Ground Loops In any audio system there are numerous ways by which ground loops can be created For example they may occur when the E 1231 is mounted in a rack cabinet or through AC ground when the E 1231 connected with preamps mixers etc These ground loops may cause hum and noise if care is not taken during connection An increase in noise from ground loops may be minimized by breaking the ground loop Generally the chassis ground of the signal line should be broken as shown below When hum is generated from a ground loop detach a short piece from the ground screw terminal Applications Feedback Prevention When the overall gain of a sound system is increased feedback will occur at frequencies where the system response has peaks Suppose the system has an uneven frequency response like that shown in the following diagram The frequency at which feedback will occur when gai
7. sets the lowpass filter s per octave attenuation for either 6dB or 12dB Peak Indicator LED The peak indicator LED lights when either the input or the output level reaches 3 dB below clipping Input Level Control This control adjusts the input gain by 12dB to allow the use of a wide range of input sources insure the best S N ratio possible adjust this control so that the peak LED flashes only occasionally Lowpass Filter Control This is a shelving type filter that provides 12dB or 6dB per octave rolloff above 2 5kHz and up to 30kHz Its main purpose is to stop high frequency noise oscillation and certain types of RF interference from damaging tweeters It is also useful in reducing excessive background noise such as that produced by old phonograph records Equalizer Sliders These sliders are adjusted to tune or equalized the overall frequency response of a sound system Equalizer Indicator LED The indicator LED turns on whenever the equalizer IN OUT switch is in IN OUT Switch Equalizer switch puts the input signals either in circuit or out of circuit of the equalizer The out position provides flat audio response no matter what the positions of the equalizer sliders and the filter LPF HPF control Security Cover Mounting Hole This hole is used to mount the supplied security cover with two screws to avoid accidental changes in set position of control knobs and switches 9Power Switch Push
8. Brass instruments Watch for hot mids around 2kHz Low end boost around 400Hz Top end clarity at 6kHz Bass drum Great low kick at 40Hz The mids at 2kHz gives the familiar punch Snare drum i Good fullness at 100Hz The crack is boosted at 2kHz Real Fig 2 easy The snares extend to above 4kHz Tom Tom The main fullness is around 200Hz The mid punch extends to 4kHz Floor Tom Same as tom but extends down to 80Hz Hi Hat Watch for the gong sound around 300Hz Good shimmer sounds are around 8kHz to 10kHz Cymbal overhead About the same as hi hat only has more low end around 150Hz Talk Box Depending on the guitar sound driving it and the resonance of each player s mouth should have great bite around 1200Hz and dies above 6kHz e Guitar _Double bass H Optional Matching Transformer Mounting CAUTION THESE SERVICING INSTRUCTIONS ARE FOR USE BY QUALIFIED PERSONNEL ONLY TO AVOID ELECTRIC SHOCK DO NOT PERFORM ANY SERVICING OTHER THAN THAT CONTAINED IN THE OPERATING INSTRUCTIONS UNLESS YOU ARE QUALIFIED TO DO SO REFER ALL SERVICING TO QUALIFIED SERVICE PERSONNEL The E 1231 s input and output are electronically balanced These can be converted to transformer balanced input and output using the optional matching transformer LT 101 input and LT 102 output 1 Set the power switch to OFF and unplug the AC cord form a wall outlet 2 Remove the case by l
9. button alternately switches the AC power on and off Indicator LED The green LED lights when the power switch is on Highpass Filter Control This shelving type filter provides 12dB per octave rolloff between 300Hz and 15Hz It is especially useful for reducing stage or turntable rumble AC hum wind noise and other subsonic components that waste amplifier power and tax speakers Filter Indicator LED The filter indicator LED lights when the filter switch is in 3Filter IN OUT Switch Pressing this switch while equalizer indicator lights provides the frequency response set for by the lowpass and highpass filter control Press the switch again to disable the lowpass and highpass filter control L lRedr P nel 9 u DAC Fuse Holder When replacing be sure to use the fuse of specified rating and type to avoid the possibility of fire Fuse rating 220 240V version 250V T80mA 120V version 250V 0 2A AC Power Cord Ground Screw Terminal Hum can result from a ground loop to be formed when the E 1231 is connected to other equipment In such cases cut the loop by removing a short piece which should usually be mounted to the terminal Output Screw Terminal The output terminal is balanced and 600 ohms in output impedance Place the supplied short piece between E and C to convert to unbalanced type input Screw Terminal The input terminal is balanced and 10k
10. mance Graphs Frequency Response Each slider is set at a max or min position Frequency Response ex 800 2 slider 1 15 ti 10 reyes neues RS OOOO EHI ABL oe ea 15 20 50 100 200 500 1000 2000 5000 10000 20000 Hz 20 50 100 200 500 1000 2000 5000 10000 20000 Hz Frequency Response 630Hz 800Hz 1kHz slider High pass Filter TET 15 10 5 T 0 0 fcz 5H fo 30012 E 5 10 10 15 15 1 d H 20 B Lis J L 20 50 100 200 500 1000 2000 5000 10000 20000 Hz 2 5 10 20 50 100 200 500 1000 2000 Hz Low pass Filter 10 Block Diagram 831113 AV I3U ONILAW YAMOd SNIVW OV U3M0d ei ASI ASIA
11. n is increased is about 500Hz In this case feedback may be prevented by attenuating dB 100 levels at 500Hz by 3dB to 5dB with the E 1231 If the overall gain is again gradually increased feedback will occur next at about 125Hz It may be stopped by attenuating the levels 2dB to 3dB at that frequency In this procedure sufficient gain in the sound system is obtained before feedback 95 90 85 80 75 Sound Pressure Level 125 250 Room Equalization In sound reinfocement system for a room the clarity of sound can be adversely affected by the room frequency response including standing waves room resonances reflections of sound relations between direct and indirect sound The E 1231 is an effective tool to equalize the room frequency response to a flat response and improve dB 500 2k 4k 8k 16k Hz Frequency sound clarity For example suppose that there is a room frequency response as shown below The equalizer sliders are set as shown below The overall response after equalization will then be as follows fee ee tas OC TEILE 100 T 1 95 90 85 80 75 Sound Pressure Level 31 5 63 125 250 o4 500 2k 4k 8k 16k Frequency The equalizer sliders are set as shown below E 315 40 50 63 80
12. oosening six side panel screws three each on each side and two rear panel screws 3 Install sleeves supplied with the transformer by tightening screws from the other side of a chassis and mount the transformer to the sleeves using screws See Fig 1 The input transformer must be located on the left and the output transformer on the right 3 4 When mounting the input transformer detach 8 connector from CN 104 reconnect the detached connector to D connector at the transformer side and then connect connector from the transformer to CN104 When mounting the output transformer detach connector from CN 103 reconnect the detached connector to connector at the transformer side and then connect f connector from the transformer to 103 C EPHEPERR D G9 LT 102 6000 6009 AC UUU ET 2 ENAS Fig 1 5 Fit the case in place Transformer Specifications Model LT 101 LT 102 Impedance 10kQ 10 6000 6000 r Frequency response 30Hz 20kHz 30Hz 20kHz at 0 15dB at 0 15dB Constant loss Within 1 5dB at 1kHz Within 1 5dB at 1kHz Distortion Less than 0 296 50Hz 5dB Less than 0 296 50Hz 5dB OdB 0 775 RMS Specifications are subject to change without notice 0 Perfor
13. put or the output comes within 3dB of clipping In addition to the usual EQ in out switch an automatic EQ bypass function provides complete equalization bypass in the event of loss of AC power and an output muting function suppresses turn on turn off transients A security cover is included with the E 1231 to guard against accidental disturbance or intentional tampering when used in fixed installations The E 1231 can be mounted in a standard 19 rack and occupies 3 1 2 of vertical space Features 1 28 filters on ISO 1 3 octave center fre 8 Variable input level control to accept varie quencies from 31 5Hz to 16kHz ty of input sources 2 12dB boost or cut at each center frequen 9 Automatic EQ bypass circuitry cy continuously variable i JOE 10 A security cover is included 3 High quality low phase shift active filters 11 Filter In Out switch 4 Precision calibrated noiseless slide con 12 Lowpass filter can be set for either trols with center detent 6dB oct or 12dB oct 5 Equalizer In Out switch 13 Optional input output transformers that convert electronically balanced input out 6 Continuously variable highpass and low put to transformer balanced input output pass filters 7 LED peak indicator to detect clipping at input or output levels Front Panel oJ ido ow Ht Inve uo uae Bt 8 DLowpass Filter Slope Selection Switch This switch
14. ua dataset i5 EU rer hy 45 p au m Cautions 1 Do not operate the E 1231 from power mains which exceeds the indicated mains voltage by more than 10 2 Do not expose the E 1231 to corrosive chemicals or liquids such as soft drinks salt water etc 3 Always refer the E 1231 to qualified technical service personnel liGeneral Description The E 1231 is a single channel 1 3 octave active graphic equalizer designed to allow clean accurate audio equalization for stage studio or commercial applications The E 1231 provides 12dB of boost or cut at each of its 28 frequencies which are centered at ISO 1 3 octave increments from 31 5Hz to 16kHz The E 1231 s active bandpass bandreject filters are designed for minimum phase shift and feature smooth slide controls with center detents for easy and accurate adjustment The filters are summed in parallel for reliability so that the failure of one filter does not interrupt operation of the others In addition continuously variable highpass filters are provided on the front panel The highpass filter has a slope of 12dB per octave and is variable from 15Hz to 300Hz while the lowpass filter can set for either a 6dB per octave slope or a 12dB per octave slope and is variable from 2 5kHz to 30kHz An input level control on the E 1231 gives 12dB of adjustment to allow a wide variety of input sources A LED indicator illuminates when either the in
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