Shure-SR107 equal 电路图.pdf

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1、222 HARTREY AVE. EVANSTON. IL. 60204 U.S.A. MODEL SR107 AREA CODE 312/866.2200 CABLE: SHUREMICRO AUDIO EQUALIZER TWX: 910-231-0048 TELEX: 72.4381 I OPERATION AND SERVICE MANUAL The Shure SR107 Audio Equalizer is a compact, versa- tile unit designed to provide adjustment of tonal balance on an octave

2、-by-octave basis across the audio frequency range. The SR107 is used in sound system applications for the purposes of feedback control in live performances, playback equalization (correcting for equipment response and/or room acoustics in prerecorded performances), and improvement in the sound quali

3、ty of live performances. Equipment response correction includes the elimination of such problems as transducer incompatibility, overload at low frequencies (rumble), tape hiss and disc surface noise. The SR107 is a balanced input and output line level device, designed primarily for installation betw

4、een the audio console or mixer and the power amplifier of the sound system. DESCRIPTION The SR107 has ten octave band, minimum phase, com- bining type filters centered on ISO? preferred frequencies from 31 Hz to 16 kHz. Each filter is adjustable for ap- proximately 15 dB of boost or attenuation. The

5、 equalized output is adjustable over a 215 dB range, and overall gain of up to 20 dB may be introduced to compensate for low input signals. A peak-responding overload light- emitting diode (LED) is provided on the front panel. The SR107 contains both professional three-pin and phone jack input and o

6、utput connectors, and a phone jack auxiliary output. The SR107 is designed for maximum simplicity of op- eration and maintenance. All components are of the high- est quality and are operated well within their respective ratings to assure maximum reliability under normal use conditions. The SR107 and

7、 SR107-2E are identical except that the SR107 operates from 108-132 Vac, 50/60 Hz and the SR107-2E operates from either 105-125 or 210-250 Vac, 50/60 Hz (switch-selectable). The SR107-2E is supplied with a detachable ac line cord (without power plug). The SR107 (only) is listed by Underwriters Labor

8、atories, Inc., and is listed by Canadian Standards Association as certified. All SR107 units are supplied with four rack-mounting screws for mounting in standard 19-inch (483 mm) audio equipment racks or in optional Shure A30A or A105A Carrying Cases. An optional protective cover, Shure Model A107A,

9、 is also available. SPECIFICATIONS * Equipment Type . .All transistor inductorless active equalizer Voltage Gain: GAlN Control at UNITY . .O dB LINE INPUT to LINE OUT- PUT -27 dB LlNE INPUT to AUX OUTPUT -50 dB LlNE INPUT to MIC OUTPUT GAlN Control at +20 dB . . . . . . . +20 dB LINE INPUT to LINE O

10、UTPUT -7 dB LlNE INPUT to AUX OUT- PUT -30 dB LlNE INPUT to MIC OUTPUT LEVEL Control . .Provides additional gain adjust- ment of k 1 5 dB over values given above, EQUALIZER IN mode only. Frequency Response . .%2 dB from 30 Hz to 20 kHz, EQUALIZER IN or BYPASS Signal to Noise Ratio . (20 Hz-20 kHz) .

11、Typically 99 dB at maximum out- put with Filter Controls and LEVEL Control at zero and GAlN Control at UNITY in EQUALIZER IN mode. Output Noise, Maximum (300 HZ-20 kHz . at LINE OUTPUT) -84 dBV (63 pV) - 69 dBV (0.50 mV), LEVEL Con- trol at +15, Filter Controls at - 15 -91 dBV (28 pV), EQUALIZER Swi

12、tch in BYPASS Output Hum and Noise, Maximum (20 HZ-20 kHz at LINE OUTPUT) . - 83 dBV (71 pV) - 67 dBV (0.56 mV), LEVEL Con- trol at +15, Filter Controls at -15 -88 dBV (40 pV), EQUALIZER Switch in BYPASS lnput Common Mode Rejection . .90 dB minimum at 100 Hz Clipping Level (30 HZ-20 kHz): Input . +1

13、8 dBm minimum (+15.8 dBV, 6.2V) GAlN Control at UNITY -2 dBm minimum (-4.2 dBV, 0.62V) GAlN Control at + 20dB t International Organization for Standardization Copyright 1979, Shure Brothers Inc. 27Al089 (SF) See Page 2 Printed in U.S.A. RadioFans.CN 收音机爱 好者资料库 I 2 34 5 6 FIGURE 1. SR107 FRONT PANEL

14、Output . +18 dBm minimum (+15.8 dBV, Typical filter frequency re- 6.2V) at LINE OUTPUT sponse characteristics are -10.2 dBV minimum (0.31V) at shown in Figures 5A and 58. AUX OUTPUT Filters are minimum phase, -34.2 dBV minimum (19.5 mV) combining type and electrical- at MIC OUTPUT ly isolated. Overl

15、oad Indicator . Illuminates 3 dB 21.5 dB before Operating Voltage . output clipping occurs and Power SR107: 120 Vac t lo%, 50/60 Input Impedance . .70 kilohms actual, balanced Hz; 6 watts maximum bridging (for use with line lev- SR107-2E: 105-125 or 210-250 el source, 10 kilohms or less.) Vac, 50/60

16、 Hz; 6 watts maxi- Output Impedance: mum MIC OUTPUT . .I ohm actual, balanced (for use Accessory Power . . . a -31 Vdc open circuit, 27 Vdc at with 25- to 600-ohm inputs) 10 mA, maximum LINE OUTPUT . .I15 ohms actual, balanced (for Temperature use with 600-ohm lines) Operating . -7C to 57C (20F to 1

17、35F) . AUX OUTPUT . .630 ohms actual, unbalanced Storage -29C to 71C (-2O0Fto 160F) (for use with auxiliary circuits Dimensions . .44.4 mm height x 483 mm width of 600 ohms or more imped- x 218 mm depth (1-314 in. x ance) 19 in. x 8-9/16 in.) (Figure 3) . Distortion: Weight .3.5 kg (7 Ib, 12 oz) lnt

18、ermodulation . .0.25% max. at 12.2 dBm (3.2V) Finish . Matte black (LINE OUTPUT) with a 60 Hz Installation . .Equipped for standard 19 in. and 7.0 kHz input at a 4:l ratio (483 mm) audio rack mount- Harmonic . .I% max. total harmonic distor- ing; may be operated in op- tion at 12.2 dBm (3.2V) (LINE

19、tional A30A or A105A Carrying OUTPUT), 30 Hz-20 kHz with Case (with other equipment) . Filter Controls at +15, GAIN Certifications .Listed by Underwriters Labora- Control +20 dB and LEVEL tories, Inc.; listed by Canadian Control at +15 Standards Association as cer- Phase Pin 3 and tip contacts of LI

20、NE tified (SR107 only) . INPUT Connectors are in * Measurement conditions unless otherwise specified: Operating voltage IOV, 60 Hz (SR107). 230V 60 Hz with VOLTAGE SELECTOR Switch in 220V posi- phase with pin of MIC/LNE tion ( 1 0 7 - 2 i ) . L I E INPUT 7 volt at 1 kHz through 600 ohms. LlNE OUTPUT

21、 and tip contacts of OUTPUT and AUX OUTPUT terminated in 600 ohms, MIC OUTPUT termi- nated in 150 ohms; GAlN Control at UNITY: Filter Controls and LEVEL LlNE and AUX OUTPUT Con- control at zero; EQUALIZER Switch set to IN. nectors Equalization Filters: Center Frequencies . .Octave spaced from 31 Hz

22、to 16 kHz. Accurate to within t 1 0 % of labeled value Characteristics . .15.5 f 2 dB boost or attenuation at center frequency 6.5 t 2 dB at maximum boost or attenuation at one-half octave above or below center fre- quency OPERATING INSTRUCTIONS I I I WARNING I I TO reduce the risk of fire or electr

23、ic shock, do not I I expose this appliance to rain or extreme moisture. I I I Functional Description (Refer to Figures 1 and 2) 1. 31 Hz to 16 kHz Filter Controls- Provide _+I5 dB level adjustment at center frequency of each of ten octave band filters. SO/M w. 6 WLlTS 1 7 1 6 SR107-2E ONLY 1 5 7 8 9

24、 1 0 11 12 13 1 4 FIGURE 2. SR107 REAR PANEL 2 RadioFans.CN 收音机爱 好者资料库 EQUALIZER IN/BYPASS Slide Switch - Disables filters and LEVEL Control in BYPASS position and returns gain of Equalizer (LINE INPUT to LlNE OUT- PUT) to value determined by rear-panel GAlN Con- trol. LEVEL Control -Operative only

25、in EQUALIZER IN mode. Provides adjustment of Equalizer output level of +I5 dB to compensate for changes in gain re- sulting from Filter adjustments. OVERLOAD LED - Provides peak signal visual in- dication when peaks in output signal approach actual clipping level of output amplifier. POWER ON/OFF Sw

26、itch - Controls ac power to unit. Power-On lndicator Lamp - Indicates ac power is being applied to unit. 30 VDC Accessory Power Jacks - Provide 31 Vdc open circuit (27 Vdc at 10 mA max.) for accessory equipment. AUX OUTPUT Phone Jack- Provides unbalanced low-impedance output for connection to audio

27、con- sole or amplifier-mixer link input. LlNE OUTPUT Phone Jack - Provides balanced or unbalanced line level output to power amplifier. MIC/LINE Slide Switch - Connects line level or low-impedance microphone level signal to 3-pin OUTPUT Connector. OUTPUT 3-Pin Male Connector - Provides bal- anced ou

28、tput at either line level or low-impedance microphone level as selected by MIC/LINE switch. May be unbalanced externally. GAlN Control - Provides gain adjustment range from UNITY to +20 dB to accommodate various input and output requirements. Operates in both EQUALIZER IN and BYPASS modes. LlNE INPU

29、T 3-Pin Female Connector - Provides balanced bridging, high-impedance input connec- tion from audio console or mixer-preamplifier. May be unbalanced externally. LlNE INPUT Phone Jack - Provides balanced or unbalanced bridging, high-impedance input con- nection from audio console or mixer-preamplifie

30、r. Ac Grounded Line Cord -Connects unit to ac power source (SR107 only). VOLTAGE SELECTOR Slide Switch - Permits se- lection of 105-125 or 210-250 Vac 50/60 Hz opera- tion (SR107-2E only). AC (MAINS) POWER 3-Pin Connector - Connects unit to ac (mains) power source via supplied line cord (SR107-2E on

31、ly). General Operating Instructions The SR107 Audio Equalizer is primarily intended for connection in a sound system between the output of an audio console or mixer-preamplifier and the input to the power amplifier(s). A typical installation provides a line level input to the Equalizer and utilizes

32、its line level out- put to drive the power amplifier. In a system using a limiter or compressor between the mixer and power am- plifier, the SR107 should be connected between the limiter or compressor and power amplifier to achieve best signal-to-noise performance. An alternate location for the SR10

33、7 is between the Link Out and Link In jacks of a console or mixer equipped with these jacks. The SR107 can provide satisfactory operation at the lower signal levels characteristic of this location and is equipped with an auxiliary output of ap- propriate level for the Link In connection. In the foll

34、ow- ing general operating procedure, variations in connec- tion for Link operation are indicated where applicable. 1. Using hardware provided, install SR107 Audio Equalizer securely in standard 19 in. (483 mm) rack or optional A30A or A105A Carrying Case prior to making electrical connections. 2. Co

35、nnect audio console or mixer-preamplifier line level output to SR107 LlNE INPUT 3-pin connector or phone jack (13. 14). (For Link use, connect link output of console or mixer to either SR107 LlNE INPUT Connector.) 3. Connect SR107 LlNE OUTPUT phone jack or 3-pin OUTPUT Connector (9, 11) to power amp

36、lifier input. If 3-pin connector is used, place MIC/LINE Switch in LlNE position. (For Link use, connect SR107 AUX OUTPUT (8) to link input of console or mixer.) 4. Place all Filter Controls (1) and LEVEL Control (3) in zero position. Move EQUALIZER IN/BYPASS Switch (2) to BYPASS. Set GAlN Control (

37、12) to UNITY. (For Link use, set GAlN Control to $20 dB.) 5. SR107: Connect ac line cord (15) to grounded 108- 132V, 50/60 Hz ac source. SR107-2E: Move VOLTAGE SELECTOR Switch (16) to 115V or 220V position as appropriate. Attach suitable a general procedure is described here. These procedures for bo

38、th house and stage monitor live performance sound reinforcement sys- tems assume that the system speakers have a consistent phase relationship and that all microphones used are also wired for consistent phase operation. If necessary, the phase of any balanced microphone line equipped with profession

39、al 3-pin connectors can be reversed using a plug-in Shure Model Al5PR Phase Reverser. House System 1. Refer to General Operating Instructions for initial connections and setup. 2. Adjust individual mixer volume control for each per- formers microphone to level slightly below feed- back threshold. If

40、 console or mixer is equipped with output phase reversal switch, set to position giving highest gain without feedback. If necessary, reduce setting of master volume control slightly and return to feedback point for each switch position to evaluate switch effect. Operation of this switch will usually

41、 affect only low-frequency feedback. 3, Increase LEVEL setting until feedback squeal or ringing is heard. If feedback appears to be high- pitched, one of five mid-to high-frequency Filter Controls (1 thru 16 kHz) will be most effective in eliminating feedback. Each Filter Control should be turned do

42、wn (counterclockwise) and back to 0 position slowly to determine which is most effective. Control which stops feedback with the least rota- tion should be turned down only so far as necessary to eliminate feedback. 4. If feedback frequency happens to fall between bands covered by two adjacent contro

43、ls, it may be necessary to turn down both controls slightly to obtain desired feedback suppression. 5. If feedback sound first noted in step 3 was low- pitched, adjustment procedure should be started using low-frequency (31 to 500 Hz) Filter Controls. 6. Having eliminated first feedback condition, i

44、ncrease gain by clockwise rotation of LEVEL Control until feedback is again noted. Repeat steps 3, 4, and 5 to eliminate new feedback condition. This may re- quire adjustment of different Filter Control or a further decrease in control or controls previously turned down. 7. Repeat step 6 until eithe

45、r: (a) volume level of sound system before feedback is sufficient for perform- ance involved, (b) feedback becomes a combination of sounds of various frequencies, or (c) any one Filter Control has been turned all the way down (-15). Adjust LEVEL Control to slightly below point at which final feedbac

46、k sound occurred. 8. Conduct voice test using each live microphone in sequence. As each microphone is used, listen for ringing. If ringing is noted, attempt to eliminate it by further decrease in appropriate Filter Control or slight decrease in LEVEL Control setting. 9. Perform critical listening ch

47、eck in audience area during talk test or live performance to determine if additional equalization adjustments are necessary to improve sound quality (boost of frequency bands in the 1 kHz to 4 kHz region to improve presence and intelligibility, etc.). Refer to Live Performance Equalization for addit

48、ional information. Stage Monitor System In a stage monitor system the SR107 is connected be- tween the audio console monitor line output (line level) or the line level output of a monitor mixer and the line level input of the power amplifier used to drive the stage monitor loudspeakers. With this ex

49、ception the initial set- up of the stage monitor system is the same as that given in General Operating Instructions. The number, type and arrangement of microphones and speakers should be the same as used in the performance. 1. If more than one performers microphone is in- volved, select lead performer or center stage micro- phone for use in feedback equaliz