M472

M4 72 EQUALIZER MODU LE

Gain : Un ity . Frequency Respon se : to .25 dB fr om 20 Hz to 20 kHz ( a l l e qua H z i ng cont rols in FLAT position) . Nois e: - BO dBDl ab s olute. (20 Hz to 20 kHz) . Har llloni c Distortfon : Less th in 0. 251 THO fro lll 30 Hz to 20 kHz at . 18 dB. ou tpu t or less . Less t han 0 . 11 at 1 kHz at +18 d8. o utput. Sou rce b pe da nc e: Less th in 10 oh., unbala nc e d. Input IMpeda nc e: Approx tMa t e l ". 2k oh. , un balan c e d. In pu t Lev el: - 8 d8. no.l na l. +18 dB• •axl.UM. (v ol t a ge l ev e l e q u ivalen t t o 6 00 ohM). Ou tput Imped a nc e: Le ss than 50 oh. , unbalan ce d . Load I llpedanc e: 10k Ohlll, . t nhlu• . Output Lev el: - 8 dBm nominal. . 18 dBm ma ltfll ulll. (voltage level e q u iv a l e nt to 600 ohlll) . Phasing: In p ut and output a r e i n ph a se with equal1zfng co ntrols in FLAT position . Powe r Requlre llents : :!:2S volt s e c , 2 5 iliA. AM b h n t re epere t ure : o t o 60 deg re es Celsius. Dt . en s l on s : 1 . 6" wi de X 7" h i gh X 6.5" de e p. 141 •• I 178 _ X 165 _) . a .c ps BS W :// tp ht

W A R D - B E CK S YSTEMS L TC .

CIRCUIT OESCRI PTt ON M47Z EQUALIZER MOD ULE

The M472 Equalize r is des1gn ed to be us e d in co nf unc t t c n ....i th th e WSS M470 ser ies o f I n pu t Modules. Following the pr ea llpl1 fl er and the sen sftfv1 t)' cont rol , the M470 s e r tes pr ovid es an I NSERT po lnt to . c c olI.lI.o d. t e the K472 Equ.l1 z e r . S1gnll Pro c es s ing The lud lo s i gul enters the Equalizer Module at pin s 4/3 at a nOllinal teve t of -8 dBIl. ZI and Zl se rve a s Ilh l ng and 1solatfon I llpl1fle rs. The)' a r e used to et x the prf lllr)' i nput s i gna l ....I t h co r r ec tion sfg nals de rived froll t he eqUlH z1 ng f ll ur ne t ....or ks . The co r rection signal is ad de d to o r s ub- t r e c ted f rom t he prf mary s ig na l r e su ltin g i n rais 1ng or l o....e rfng t he leve l of selec t e d por tions of th e audfo sp ectru m. MI D FREQUE NCY eq ue l t ae t t e n I s contin uou sl y a dj ustab le f r oll 0.4 t o 6.4 kHz a nd is co n troll ed by R7/8. Z3 with one - half of Z4 f o r ll a s ta te va ria ble t y pe band -p a s s ffl rer . The freq ue nc)' de ter lli n in g co mponents a re R7, R8, RI2 , ItI B, C5/6 and CIOIl I. The CUT/BOOST cont rol ItS feeds an in-phase o r out -o f-phase propo rt10All sign a l to t he f ilte r Input a t Z3, p fn 3. The output of the fil te r In tl,lrn is fn jected into Zl , pin 3 . Depending on the setti ng of ItS, the fi lte r outp ut s 1gAl l wil l eit her a dd to ( BOOST) o r subtrlct fr Oll (cur } t he p r 1. a r)' si gu l pIss1ng throug h ZI. Switc h SWl t s a HI/ LOW Q s ....f tch allo....1ng to c hange t he Q of the b a nd- pas s filte r f rOIl a pp r o x1llat e ly 1.6 to Z. The HIGH FREQUENCY sec t i o n o f th e unf t pro vfd es SHElV ING t y pe of e q ua l iz a t i o n . The CUT/ BOOS T co n t r o l RZZ a llows to choose a n I n -p hlSe or ou t -o f-p hase p ro por tf ona l s i gna l or fgf na t1 ng It ZZ. Thls sign al is passed t hr ou gh t he h l qh- pu s filt e r co ns1 st l ng of Cg and RZI bac k to t he s Ulllll1 ng node of ZZ, e ff e c t h e l y addin g to o r su bt r acting f ra il the pri llary slgn .l. The LOW FREQUENCY section also provides SHELVING t)'p e of equ alizat f on . The CUT/B OOST control R25 allows to choose the a

phuing Ind . a gn i tl,lde of the cor re c t i o n signal . R1 5 is .c ps

followed by a lo ....- pa ss f il t er- c o. pr is l ng 1128, RZ9 , CI5 and Cl 6. Z4 serves as an holatfon buff e r a.p llf1er, ....l th its output BS

feeding blct to the SUllllllng no de of ZZ. R18 a ll o....s ce n t tnucu s W

a dj ust llen t of t he - 3 dB r oll- o ff po int be tween fr eq uencies of ://

SO to 200 Hz. tp ht

2- 1

WAR D- B E CK S Y STEM S LTD

M472 EQUALIZER_MODULE Ga jn : Unity +0.25 dB from 20 Hz to 20 kHz (a1] equalizing contro]s FLAT position) -80 dBm absolute (20 Hz to 20 kHz) Frequency Response: Noise: Harmonic Distortion: Less than 0.253 THD from 3 0 Hz to 20 kHz +18 dBm output or Tess Less than 0 .13 at kHz at +18 dBm output Source Impedance: Less than 10 ohm, unba lanced _ Input Impedance Input Leve] : Approximately 2k ohm , unba lanced .

dBm nomina 1 +18 dBm maximum. (voltage Teve] equivalent to 600 ohm) _ Output Impedance: Less than 50 ohm , unbalanced . Load Impedance: 10k ohm, minimum Output Leve] : dBm nomina /_ +18 dBm maximum (voltage Teve] equivalent to 600 ohm) Input and output are in phase with equalizing controls in FLAT position. +25 volts dc , 25 MA to 60 degrees Celsius .

{ai" wide 7"high Smf" deep . MM X 178 mm X 165 Phasing: Power Requirements : Ambient Temperature Dimensions

STEREQ MOD FJCATION KIT#K20425/2 10) Position cable assembly 5A91-037 be wired the four connectors being modified and secure using nylon cable ties existing cab Ensure that the new cable will not interiere with reinstallation connector tray 'T1) Solder wires from cable assembly pins four connectors only that are being modified and the 12) Reinstall equalizer connector tray by performing the reverse steps and 13) Install new ML7ZA Stereo Equalizer Modules and secure them using mounting screwS removed from M472 Equa Tzer Modules or blanks 14) Reapply power the conso 2-2

control R7 R8 : Cont nuous variable from 0. to kHz . The ca ibration re fers t0 the center frequency of the be | I- shaped PEAK NG response curve MF KHz Mid FREQUENCY sect ion BOoST/ cut control RS: Cont inuous ly variable from 15 dB to 15 dB . Sets ga i n or loss of mid frequency content of the program materia| with reference to the nomina leve | MId FREQUENCY sect ion, Q SELECTOR switch SWZ lows to se lect ther high or Low Q-factor for the MID FREQUENCY PEAK ING filter 2 H L 0Q 140 I00 180 LOw FREQUENCY section, FREQUENCY

contro| R28 Cont inuous variable from 50 t0 200 Hz . The ca ibrat ion def nes the 3 dB corner point from the maximum ava Jab le SHELVinG Boost or cut of 15 dB. 200 Hz Low FREQUENCY sect ion- BoosT/cut control R25: Cont nuous iy variable from 15 dB to +15 dB . Sets ga i n or loss of low frequency content of the program material W | th reference to the nom i na leve I . EQUALIZER INSERT switch Sw | When depressed, this switch nserts the M472 EQUALIZER into the igna path and act vates assoc ated LED. When re leased, the unequa | i zed input igna bypassed directly to the output IOlzz ISSUE DATE REDRAWN REVISION APP WBS WARD-BECK SYBTEMB DRNPMAHoVY ENG_ CKD Rell APP 6 SCALE M472 EQUALIZER MODULE

control R7 R8 Conti nuous ly variable Fron [0 kHz. The ca ibration refers to the center frequency 0 f che be | I- shaped PEAK|NG response curve. MF KHI mid FREQUENCY section Q SELECTOR switch SW2: Alows [o se lect [her HiGH or LOH Q-factor For the Mid FREQUENCY PEAKiNG fi Iter MId FREQUENCY sect Ton, BoosT/CUT control RS: Continuous variab le From 15 dB cO 15 dB .

Sets gai n Jos 5 0f mid frequency content of the program materia | with reference Lo che nomina leve | 20 210 H 0 L 140 100 Low FREQUENCY sect ion, FREQUENCY ADJUS TMENT control R28 Continuous variable from 50 t0 200 Hz . The ibrscr ca ion def nes che dB corner point from the MaxiMum avai lable SHELVING Boost or Cut of 15 dB .

Hz LOw FREQUENCY sect |on Boost/cut control R2S : Cont nuous var iable From 15 dB co 15 dB _ Sets ga or Jos of Tox frequency content 0 f the program materia] wich reference LO che nem (na leve ! . EQUALIZER |NSERT shitch Swi When depressed, this swi Ech nserts che M472 EQUALIZER into the igna patn and act vates assoc iated LED.

When released the unequa lized nput signa i5 bypassed rectly co the output. 10/77 Issue oate REDRAWN RE VISION APP WBS WARD-BECk sybteMB DRNRMAHOYEY M472 ENG CKo Rlll EQUALIZER MODULE APP