M471A — Stereo Input Module

MLZIA STEREO INPUT_MODULE The M471A Stereo Input Module designed accept stereo line level sources. The unit processes the input signal as required and Fou tes the appropriate points within the mixing console system INPUI The input section consists the CHANNEL ON switch Sw3 and the PHASE REVERSAL Sw tch SW2 , which effects only the right input signal path. The channel ON condition indicated by the Mumination the CH ON switch pushbutton when depressed and similarly the pnase reversed condition indicated by the illumination the LED , DST Iocated adjacent SW2 _ FADER Following Sw3 the signa brought out the module via edge connector pins 10 , and 11, for connection the inputs balanced stereo fader _ The outputs the fader are returned the module Pins and 13, for left and right signals respectively The input side the fader also serves as the ckup point for the dual operational amplifier 21 which combines the left and right input signals and drives the module internal prefade bus This bus also brought out edge connector pins and for further assignmen as required 09B BOOSTER AMPLIFIER The 8-1098 Booster Amplifier operates with gain dB and ecovers the loss incurred when the fader placed its normal dB "in hand" position The extra dB gain used overcome the dB loss the balance potentiometers their mid-position thereby maintaining the dBm output levels BALANCE AND MAIN_OUTPUTS Tne output signal the 8-109B amplifier used feed both Teft and right main outputs via tne BALANCE switch SW7 and ganged BALANCE control R5 through RB also provides the feed for dual operationa amplifier 22 which combines the left and right ou tput signals and drives the module internal post-fade bus This bus brought out edge connector Pins and for additional assign- ment as required_ 2-1

8-109 AMPLIFIERSERIES The 8-109 series of amplifiers are utilized a $ an interna] component within various WBS series 0 f audi 0 conso ] e modules . Each 8-109 amp]ifier mounts as plug-in as sembly onto the modu] e motherboard . The 8- 109 amp]i fier provides an actively balanced output with +30 dBm capability It is empoyed as output or booster amplifier with either baTanced or an unbalanced input The following specifications apply to the 8 - 109 series 0 f amplifiers Unit Input Gain 8-109 8-109A 8-109B 8-109 8-109D 8- 109E 8-109F 8-109G Ba lanced Unbalanced Ba ]anced Ba ]anced Unbalanced Ba lanced Ba Tanced Ba ]anced 15 3 18 39 dB 29 d8 33 dB 23 Frequency Response: +0.2 dB from 20 Hz to 20 kHz_ Noise: 108 dBm EIn from 20 Hz to 20 kHz Harmonic Distortion: Less than 0 .13 THD from 20 Hz to 20 kHz at +30 dBm output (typically less than 0 .

028 at mid-band) Source Impedance: 600 ohms or less , ba lanced or unbalanced Input Impedances : Models with balanced input: Sk ohms minimum. 8-109A : 30k ohms 8-109D: 4700 ohms Input Levels Depending on ga in 0 f Peveisular mode1 and system operating (Refer to gain specifications above 8-109-1-1

8-109 AMPLIEIER_SERIES inverting amplifier with E1 externally strapped to E6 . The output of a ] 1 modeIs 0 f the 8-109 series is actively ba lanced and is brought out at pins E4 and E6 8-109-1-3

M47IA STEREO INPUI_MODULE Input Sensitivity: dBm (ref . 600 ohm source} Frequency Response: +/-0.25 dB from Hz kHz Signal Noise Ratio: 83 dB . below +10 dBm . Harmonic Distortion: Less than 25% THD from 20 kHz +28 dBm output Less than kHz outpul Hz less +28 dBm Source Impedance : 600 ohms balanced. Input Impedance: 500 onms Output Impedance: Less than 100 ohms (at outputs amplifiers only ) 8-109B Load Impedance : 600 ohms balanced Output Level dBm nominal +30 dBm maximum (at outputs 8-109B amplifiers only ) Phasing: Input and output terminals designated Dy numbers are phase Power Requirements: +/-25 volts dc, MA maximum.

Ambient Temperature: Dimensions: degrees Celsius wide high 6.5" deep (41 Mm 178 Mm 165 mm } 1-1

B-I09 AHPLI FI ER SERI ES

!:J..Q.iE. Al l parts as per B-I09 except a s noted below PART