M462

8-109 AMPLIFIER_SERIES Output Level : 6 ; ` i'3rt -t1) € 20i-8 +30 dBm 8 - ^ maximum_ 3nw P3c P7 #<= :Ti' Power Requirements +/- 21.5 volts ac, MA quiescent current MA +30 dBm output _ Icaicu 6S302 i'o"R (J' -& Amb Y:;'Eorj Mec ent Temperature: degrees Celsius 3nBTE0 70*10i9 C. W Dimensions 3 .25" 3.38" 0.57"1 N"6 (83 -1 - .

pn:wolic" Mm Mm Mm ) The 8-109 comprises two amp lifier sections one consisting through QL_ and the other 22 with 05 through 08 21 with The Iinear integrated circuit operates a5 preamplifier and buffer stage drive the transistor output amplifier section In the ma jority the 8-109 models the inputs the [wo amplifier sections are interconnected cross coupled differential pair provide balanced input.

Alternately , the case the 8-109A and single-ended unbalanced input used . The balanced input yields several input characteristics similar those an input transiormer Output Tevel remains constant when the input fed from either balanced an unbalanced source Good common mode rejection another feature this type input configuration E3toy] ua;uc 783 For amplifiers operating the balanced mode the value R1S establishes the feed back ratio the [Wo amplifier sections and thus controls the amplifier gain.

When utilized the unbalanced arrangement, the lower amplifier section (Z2 with 05 through 08) used as the input section, with the input signal applied pin E2 Amplifier gain determined by the values R6, RII and R12_ One half the balanced output signal appears Pin E6 _ The upper half the amplifier (21 with through 04) operates as unity gain inverting amplifier with E1 externally strapped E6 .

rt 2noi6ji1i39 1e The output all models the 8-109 series actively balanced and brought out pins Eb and E6 Dsoneis& 2Mco 0g3 I Cij)€ F ')C ' 660 _ 8-109-1-2

8-109 AMPLIFIER_SERIES Output Level : 7"' nb +30 dBm maximum_ :am G n =7 2 @2/-8 8 - 20w ZU6 `F~' Power Requirements: +/- 21.5 volts ac, MA quiescent current MA +30 dBm output _ lcaicu 6s_ns 076 (J'-A Amb ent Temperature: Y:; 'EJEJ Tec degrees Celsius 373TE0 73"4119 C . M Dimensions 25" 3.38" 0.57"1 7"5 (83 Jtct 7n:voxica hit Mm mm Mm ) The 8-109 comprises two amp lifier sections one consisting through QL_ and the other 22 with 05 through 08 21 with The Iinear integrated circuit operates a5 preamplifier and buffer stage drive the transistor output amplifier section In the majority the 8-109 models the inputs the [Wo amplifier sections are interconnected cross coupled differential pair provide balanced input.

Alternately the case the 8-109A and single-ended unbalanced input used . The balanced input yields several input characteristics similar those an input transformer Output Tevel remains constant when the input fed from either balanced an unbalanced source Good common mode rejection another feature this type input configuration EJtoy: {uq'uO i83 For amplifiers operating the balanced mode, the value R1S establishes the feed back ratio the [Wo amplifier sections and thus controls the amplifier gain.

When utilized the unbalanced arrangement_ the lower amplifier section (22 with 05 through 08) used as the input section, with the input signal applied pin E2 Amplifier gain determined by the values R6, RII and R12_ One half the balanced output signal appears Pin E6 _ The upper half the amplifier (21 with through 04) operates as unity gain inverting amplifier with E1 externally strapped E6 enoijsjitijeda The output all models the 8-109 series actively balanced and brought out pins Eb and E6 _ DsonE 6& 2mco o03 1 nidf1F "^'Ci | 660_ 8-109-1-2

8-109 AMPLWELER_SERLES The 8-109 series amplifiers are utilized as an interna componen [ within various WBS series audio console modules Each 8-109 amplifier mounts as Plug-in assembly onto the module motherboard The 8-109 amplifier prov des an actively balanced output with +30 dBm capab ility employed as an output booster amplifier with either balanced an unbalanced input . The following specifications appiy the 8-109 series amplifiers 17 ; '{" 15 Ynit Input ;Tiiam 5 Gain ^ 5 77{ ) 0)1 2 ~^ 79r 0 ~oionni 2 8-109 Balanced dB 8-109A Unbalanced dB oni 779.- | fils-ij ~R3- .

8-109B Balanced dB 70f;27sn] 071 0c ? "9tilo 8-109C Balanced dB 8-109D Unbalanced 29 dB Ati> am_ OoT 20!-6 70 .#{t 4> ^ 8-109E Balanced 29 6Q Usijenrs 0*76 2rc1jj-e Aeoj-8 8-109F Balanced 33 dB F, ^*1 9]67179; |7 tvan B& A5 votg 8-109G Balanced 0on23 dB TUGn| bsj;E 'enie Frequency Response: +/ - 0.2 dB from 20 Hz kHz_ 375 € ( 571 | Cf J?nnj 920n; Noise: dBm EIN from Hz 20 kHz _ bb3r &lscou J;9f; Harmonic Distortion: Less than 0 .1% THD from Hz 20 kHz +30 dBm output (typically less than 0.0276 mid-band) 2 ' 7 s1|Gv 37"1 ' ' (-td~e 79iT) Jn 5 Gmb Source Impedance: 600 onms less balanced unbalanced _ Input Impedances: Models with balanced input: ohms minimum {J392 UCn1 00tfje 8-109A : 30k ohms Ds m79J9b 0EP pe 'J" - 5r8'2 'Van; 8-109D 4700 ohms Jqiuo bajns'50 B71 1 , 7 09 F90|6 Gm& Input Levels: Depending gain Or particular model and 4mf 2n.]~8 system operating levels (Refer gain specifications above.

j = Hdcm 1|5 ALGluC Afi"` Output Impedance: Less than 100 ohms enic J') {rie OC Load Impedance: 600 ohms, balanced . 8-109-1-1

N462 EQUALI ZER NODULE

6aln : Un ity . Fr equene yRespo nse : ~ O . 2S d8 f ro ll 20 Hz t o 20 kHz (.11 equa l1z 1n gcon tr o l s in FLAT pos lt 1on ). Moln : ( 20 Hz t o 20 kHz ) - 80 dBa.

Har llon le Ofs t o r tl o n : Le ss thIn 0 .251 THO f r oll 20 HZ t o 20 kHz at .2 8 dBIl outp ut o r t es s . Less thIn 0 . 1% .t 1 kHz at +2 8 dBIII output. Sou r c l l rape da nc e : 600 o hms llIulmu m, ba lan ce d / unbal an c e d . I nput Impeda nce : 30 k ohms t IOS , balanc ed . Input Level: ~10 to +8 dBm nOlll1 nat . +30 dB., lIIa x l mullI. Output I lipeda ne e: Less than 100 ohlls . Load I .pedanee: 600 oh lls IIln l mum, ba lan c e d . Ou t pu t Lne l : -1 0 to +8 dBIl nOllllna l . +3 0 dBIi lIu :l I1UII. Phasl nll: LOlli nu aber ter.lnals of In put an d out put are 1n phlse. POllle r Ill qu 1re.ent s: t 25 'to lts de, 100 .... lIaxl. ua. "'abien t r eeper-e ture : 0 t o 60 d ellree s Ce ls ius. 01alns l o ns : 1.6 " 1II 1d l X 7 " h 111h • 6 .5 " dee p. ( 4 1 a• • 178 aa X 165 _> a .c ps BS W :// tp ht

1-1

M462 EQUALIZER MODULE Ga in: Unity _ +0.25 dB from 20 Hz to 20 kHz (a71 equalizing contro] s in FLAT position) Frequency Response: Noise: (20 Hz to 20 kHz ) -80 dBm . Harmonic Distortion: Less than 0 . 25% THD from 20 Hz to 20 kHz at +28 dBm output or Tess Less than 0 . 1% at kHz at +28 dBm output.

Source Impedance: 600 ohms maximum , ba lanced/unbalanced Input Impedance: 30 k ohms +10% ba lanced Input Level : -10 to +8 dBm nomina ] maximum . +30 dBm Output Impedance: Load Impedance: Less than 100 ohms _ 600 ohms minimum , ba lanced _ Output Leve] : -10 to +8 dBm nomina ] maximum +30 dBm Phasing: Low number terminals 0 f input and output are in phase _ Power Requirements : +25 volts dc , 100 mA saximum.

Ambient Temperature: 0 to 60 degrees Celsius. Dimensions: 1 6 " wide X 7" high X 6 . 5 " deep _ (41 Mm X 178 Mm X 165 mm) 1-1

M462 EQUALIZER_MODULE Gain: Unity . dB from 20 Hz to 20 kHz (a/1 8qu25 Tizing contro]s FLAT position) _ Frequency Response: Noise: (20 Hz to 20 kHz ) 80 dBm . Harmonic Distortion Less than 0.258 Thd from 20 Hz 20 kHz +28 dBm output or Tess Less than 0.15 at 1 kHz at +28 dBm output Source Impedance 600 ohms max mum ba lanced/unba Tanced, Input Impedance: 30 ohms +10% ba lanced _ Input Level: -10 +8 dBm nomina] _ maximum +30 dBm Output Impedance Less than 100 ohms Load Impedance= 600 ohms minimum, ba Tanced .

Output Level : 10 to +8 dBm nomina 1 _ max mum +30 dBm Phasing: Low number termina ] s 0 f input and output are Phase Power Requirements: +25 volts dc 100 MA maximum _ Ambient Temperature: to 60 degrees Celsius. Dimensions : {ii" wide 7" high 6m5' deep . mm X 178 MM x" 165

1'4462 EQUALIZER MODULE

~ The 1npu t s i gnal enters the /11462 module via pins 1 and 2 of t he e dge co nne c t o r . z t and I2 serve as the prea mpl t rt e r . il26 is part o f t he pream p c t r c u t t and is used t o set the overa ll equal h e r gain to un lty . The outp ut of t ne pr eampl t f i e r- is r oute d dir e ct l y to one of the normally closed contacts of t he INSERT switch SW3 to a llow by passing of the e qua l he r . Add it io na l l y , the preamp output is fe d to I3. the f 1rst of f our casc aded SUlllmi ng ampl ifiers IJ th rou gh I6 . Si g na l pr ocess i ng I 3 throug h I6 serve as 1Il 1:dng a nd isola t ion allplifiers . They are use d t o mix the prima ry i npu t s1gnal with a correct ion s ig nal de riv ed from t he outp uts of th e 4-126 filt er netwo rks, resu lting in raising or low e r i ng th e leve l o f selected co r e t c ns of the e ud t 0 spectrum . Addit io na lly , they isolate th e filter ne twc r ks from e a c h o th er and p re vent i nteraction between t he m. res ulti ng in accura t e a nd r e pea t a ble equal1zing perfo rlllllnce. The CUT/SOOST controls R13. il14 a nd R16 feed an tn - phe se or out -o f - pha s e proport iona l signa l t o t he buffer amplifier s I 7 . IS and I 10 respect ively . The 1e ve t of the s1 gn a l fed t o t he buffe rs is d ep endent on the CUT/BOOST con t r ol set t ing wit h maximu m l evel occur r ing at eit her end of the potentiome ter , lind a null setting at the pot entiometer n f d - nc s t t ton . Full clock - wise or f ull counterclockwise potentiome t er settings will res u l tin the max1mum equal1 ze tt on e xc ur s i on s of +15 dB and · 15 dB r espectively. The out put s of buffer ampli fi ers Z7. IB a nd I 10 a re routed t o the 4·126 printed circuit board wh1ch conta i ns t h r e e band- pa ss filt e r s c orres pondi ng to each of the three s e ct i o ns of the equalizer . Each band· pass filter passes o nl y a po rt ion of the sign a l delivered to it fro lll the buff e r, with t he center f requency and ba nd width determ ined by the FREQUENC Y. " 0" an d a

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2-1

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M462_EQUALIZER_MODULE Input J"Jucjx= Aolh The input s igna ] enters the M462 module via pins and 0f the edge connector 21 and 22 serve as the preamplifier_ R26 is part 0 f the preamp circuit and used to set the overa] equalizer gain unity. The output 0 f the preampl ifier routed directly t0 one 0 f the norma ]Iy closed contacts 0 f the InSERT switch SW3 to a]l0w bypassing 0 f the equalizer no?

Addi the preamp output 15 fed to 23 the first 0 f tiogclded eV 0 - four s umm ng amp]ifiers 23 through 26 _ JmJuo:?7 J]v 4nT Signal processing M-" 7 9 0 067 K3n900 9'1 7 23 through 26 serve a5 mixingnput and isolation amplifiers They are used mix the primary Tgna with correction s igna 1 deri ved from the outputs 0 f the 126 filter networks resulting raising or Towe ring the Teve 0 f selected portions 0 f the audi0 spectrum Additionaly , they isolate the filter networks from each other and prevent interaction between them.

resulting accurate and repeatable equa]izing performance 6 76 - The cut/boost controls R13 , R14 and R16 feed an in-phase or out-of-phase proportiona / signa | the buffer amp]ifiers 27 28 and 210 respectively The eve] 0 f the gna1 fed to the buffers Ts dependent on the Cut/boost control setting with max mum Teve occurring at either end the Potentiometer and nul1 setting at the potentiometer mid-position.

Ful] clock- wise or ful counterclockwise potentiometer setti#95 Will result in the maximum equalization excursions 0 f dB and -15 dB respectively . The outputs 0 f buffer amplifiers 27 28 and 210 are routed_ the 4-126 printed circuit board which contains three band - pass filters correspond ing to each 0 f the three sections 0 f the equa izer Each band-pass filter passes only portion 0 f the s igna delivered to Tt from the buffer with the center frequency and band width determined by the FREQUeNcY Q" and PEAK/SHELF contro]s .

0no | 6 D9 ] 67909 6 n € { bnuogmo) 9 7 7 790 7o 7 0 } 10 JVqjvo 90 > 278 90q 6 0t Enj cn2 133 : W? T9]27 [ 90] 10 2 J ? 6-no) 0s0o %i | 617 0n snj t0 37 0 2 -1

control RI . R2 : Cont nuous vJ iable From [0 25 kHz che PEAK ING mode . che frequency ca bration refers LO the center frequency 0f the be haped_ PEAKiNG response curve the SHELVING mode che ca 1 ibration de ( nes Ehe dB corner from che maximum Table SHELVING BOOST Eot"8 ava Or 0 f 15 dB . WBS M462 3.2 12 8 HF high FREQUENCY sect Ton; Q ADJUSTHENT R3 Alows vary- Kng 0 f the Q- factor 0 f che PEAK ING ter For va |ue 5 ron [O 10 . R3 i$ noperat ve In the SHELVING mode 8 10 CKHE High FREQUE NCY section Boost/CuT contro| RI3 Cont nuous var iab le From 15 d8 t0 +15 d8 Sets ga i n or Ias $ of high frequency content of che Program materia wlch Fe ference t0 che nomina leve | . High FREQUENCY section, HODE SELECTOR Swi cch SwI When depressed, the HF section the equa izer tes the SHELVING mode . When released, che Ppera NG mode selected- MID FREQUE NCY seccion, FREQUEnCY

control RA E RS: Continuous variable From LO kHz . The ca ibration refers The center {requency of che be | / - shaped PEAK ING response curve . MF 2 10 Q-€-KHz MId FREQUENCY section, Q AdJusTMeNT R6 A Tows vary- ng 0- che Q-factor of the PEAKING [er for va ues from LO I0. MId FREQUE NCv sec Lion BoosT/cuT controi RI4 ; Continuous variab le romn 15 dB I0 115 dB Sets ga i n Or 4055 0 f mid Frequency content 0f the program ma teria | with reference Lo the nomina leve | LOw FREQUENCY section, FREQUENCY ADJUS TMENT con Lro R10, R | 1 Cont nuous |y variable from 25 to 400 Hz. the PEAK |NG mode , the Frequency ca ibration refers t0 the center frequency the be | I-shaped PEAK NG response curve. In the SHELVING mode the ca ibration def nes Ene dB corner nt rom Lhe Max Muin Iable SHELVING Boost E8f ava or of 15 dB . 50 I00 200 300 400 Low FREQUENcY sect ion. Q

R12 A |ows varye ng of the Q- factor of the PEAKING ter for va |ue5 From 2 to 10. R12 is noperative the SHELVING mode. 2 10 0-€-Hi Low FREQUE NCY sec t ion BoosT/cut contro| R/6 Cont nuous var iable Fon 15 dB LO 15 dB Set 5 ga Or 0S $ 0f ow frequency content of che Program ma(eria with reference CO che nom i na ! leve | Low FREQUENCY section, MODE SELECTOR switcn Sw2 ; When depressed, che LF sect on of che equa izer the ShELviNG mode When re lcased, che Pperates ING mode se lected: EQUALIZER |NSERT Swi Ech Sw3: When depressed; chis Swi tch nserts the M462 EQUALIZER into che igna Path and BC[ i vates assoc ated LeO. When released; che unequa| ized NPUt signa | T$ bypassed rectly to cne outpu:. Ii0/77 VISSUE |DATE REDRAWN Revision APP WBS WARD-BEck bybteMS DAN PHdtons} EHG: CKD_KMl AppP SCALE M462 EQUALIZER MODULE

cencnO Concinuous Table Trom [0 25 kHz_ Lhe PEAKING made che frequency C4 | bra ion Fers/NG the center frequency [ne s haped Ponse curve tne ShELViNG made [he ibra Ehe corner 0O n FCM che (ux mun DY0 able SHEL BoOST or CuT WBS V462 12 8 HF Aigh FREQUENCY secti On. ADJUSTHENT Allons R3 varv= ing the Q- Factor the PEAKING Ter For va |ue $ Fron 10 . inoperat ive che SHELVING mode KHI Jigh FREQUEMCY 5ec( Boost/cut control RI3 Conl able (oFrom inuous OB to +15 Sets gain or Tos$ of n gh frequency content Ene program materia Wlch reference Ea nomi na Leve high FREQUE NCY sectiOn; HODE SELECTOR Sk | Ech SWI: Khen depressed, the seciion the eque |izer operates the SHELVING mode Xhen FE ea5e0 the PEAK ING mode s2 lected- hid FREQuEncY seccion FREQUENCY ADJUSTHENT control Continuous riable ~CM khZ Tne Tbra Gon refers Ehe center frequency of che sheped PEAK |NG response curv MF KID FREQUENCY sect Ion 4DJUSTHENT ng the Q-factor af Lhe PEAKING from Tows vary= [er For va |ues LHI HID FREQUERCY S0C Ton boost/cuT control R |4 Cont Iquous | varTable Fcom dB [0 Sets gain los mic Frequenc conteni Lhe program teria wlth reference the nom Teve Lor FREQUENCY seclion; FREQUENcY ADJUS THENT controi Rid_ R| 1 Lont nuous variahle fron 15 fo #00 Hz . the PEAKING node the Frequency calibra Ion fers Lhe center (requency the bc | -shape PeAKiNG nesponse curve che ShELviNG Moce the ibration nes che corni ron Ehe max MUI Bot ava Jable ShELVING BodsT or 50 1w 200 J00 Lok FREQUENCY Gect Ton;

Jows vary- the PEAKING Rliced ing che Q-Factor for va |Ves FOT 10. RI2 noperative the SHELVING Mode Low FREQUE NCY scc; /o7ro_ Boostdeut conerol Rib: Conlinuous able Sets gJn Toss frequency cantent Reve Ene program ter (a Ath re ference che nam Dai Lok FREQUENCY section, Hode SELECTOR switch SWZ: Khen depressed, 580 che equa izer erales [he SheLViNG noce . Hhen re icjsec, the PEek#NGSmode selected: EQUAL ZeR INSERT tch SW} When dcpressed Ehis sw| Icn nserts Ene 446 EQUA IZER nto [he 5 Igna Path aclivates D$ S0C ted LED Hhen leased, che unequa ized input Tgna is Eypassed directlv cne outout 10/77 ISSUEIDATE RECRAWN Revisiom WBS WARD-BECk bybtemB DRN PMders ENG CKD KML App; SCALE M462 EQUALIZER MODULE

M462 SERIES EQUALIZER MODULES vi ) With cut/Boost control set at +15 dB BOOST, de- crease the input frequency to 75 Hz and confirm an output level drop of dB _ Increase input frequency to 125 Hz and confirm an output level drop of dB _ Confirm of using the following equation. vii) viii) fc 3 F1 where center frequency fc 100 Hz 75 Hz 125 Hz 1 3 Other values of can be determined in similar manner Return LF cut/boost control to the position.

ix) b ) Mid Frequency Note only Mid frequency section operates in the Peaking mode Rotate control fully CcW to the position. Apply 1.6 kHz, dBm input signal With cut/boost control set at +15 dB BOOST rotate FREQ . ADJUST control to obtain maximum output (Max_ output should occur at the position marked 1.6 KHz) _ Confirm cut/boost range of +/-15 dB _ With the cut/boost control set at +15 dB of BOOST decrease the input frequency to 1.2 kHz and confirm an output level drop of dB_ Increase the input frequency to 2.0 kHz and confirm an output level drop of dB _ Confirm of using the procedure outlined in a) step viii) Other values of can be determined in similar manner Return MF cut/boost control to the position.

#) W) vi) vii) viii) Note: The M462B module has dual Mid Frequency range. It can be tested with the procedure outlined in 7 _ b ) using center of 3.2 kHz for MF1 and 400 Hz for MF2 In the MF1 frequencies the -3 dB corner frequencies should occur at 2.4 kHz range, and 4 kHz for Q of 2 .

In the MF2 range, the -3 dB corner frequencies should occur at 300 Hz and 500 Hz for 0 of Page of

" 46 2 EOUALIZER MOD ULE

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