M441

SOURCE IMPEDANCE Microphone input 150 ohms balanced GAIN Line input 600 ohms or less balanced a) Preamplifier Booster amplifier input 600 ohms or less balanced Microphone input 6OdB to 1OdB + 0.5dB selectable via INPUT IMPEDANCE sensitivity switch_ Microphone input 750 ohms or greater balanced_ b) Line input unity to 18dB + 0.5dB selectable via sensitivity Line input 20K ohms balanced (may be externally terminated switch.

in 600 or 150 ohms) . b) Booster amplifier 1SdB + 0.25dB Booster amplifier input 4000 ohms balanced_ FREQUENCY RESPONSE OUTPUT LEVEL +0.25dB 30Hz to 2OkHz Preamplifier 1OdBm nominal_ +27dBm maximum. NOISE Booster ampli- fier 1OdBm nominal, +2OdBm maximum_ Microphone input equivalent to -124 input noise for 70 sensitivity LOAD IMPEDANCE Line input greater than 75dB signal to noise (referred to a test level Preamplifier 600 ohms balanced.

1OdB above the nominal operating level) . Booster amplifier 600 ohms balanced_ TOTAL HARMONIC DISTORTION OUTPUT IMPEDANCE: Less than 0.25% 30Hz to 20kHz measured with preamplifier out- Preamplifier less than 25 ohms Booster amplifier less than put level of +24dBm and a booster amplifier output level of +18dBm. 25 ohms INPUT LEVEL PHASING Microphone input -7OdBm to 2OdBm nominal, -35dBm to +1SdBm The numbered terminal of the input pair is in phase with the maximum: numbered terminal of the output pair.

Line Input 1OdBm to +8dBm nominal, +25dBm maximum_ POWER REQUIREMENTS Booster amplifier input -25dBm nominal, +SdBm maximum: 48Vdc regulated 65 ma AMBIENT TEMPERATURE ACCESSORIES: 0o to 600C DIMENSIONS 1.6"W x 6.625"H x 6.5"D WEIGHT 1.5 Ibs WARD-BECK SYSTEMS LTD_ WARD-BECK SYSTEMS INC, 841 Progress Ave_Scarborough,Ont; MH 2x4 290 Larkin St; Buffalo; New York 14210 Telephone: (416) 438-6550 Telex: 06-23469 WBS

SOURCE IMPEDANCE Microphone input 150 ohms balanced nn @ 600 ohms GAIN nalanced Juoater umpmcr input 600 ohms ess halanced Preamplifier Micraphone input GOdB OdB 0.SdB selectable via INPUT IMPEDANCE sensitivity switch: Microphone input 750 ohms grcater balanced: bl Line input unity 18dB O.5dB selectahle via sensitivity Line input 20K ohms halanced nmin extemnally terminated Swltcha 600 or 150 ohms) blBo oste amplifier 15dB 0.25dB Booster amplifier input 4000 ohms balanced.

FREQUENCY RESPONSE OUTPUT LEVEL 40.25d8 30H2 20KHz Preamplifier . 1OdBm nominal, +27dBm maximum NOISE 3o0,(Cr ampliner ludBmnominal +2ud3m maximum Microphone input equivalent 4124 input noise for -m Isensitivity LOAD IMPEDANCE Input 4rcalcr Inan 75dB signal to noise (referred test level Preamplifier 600 ohms balanced. 1OdB above thenomina operating levell Bocste Karnplifie BO0 ohms balanced: TOTAL HARMONIC DistoRTion OUTPUT IMPEDANCE: Less than 25% 30Hz t0 20kHz mcasured with preamplifier out Preamplifier less than 25 ohms Booster amplifier less than put leve +24dBm booster ampuntter qutoullevel AedBm 25 ohms; INPUT LEVEL PHASING Microphone input -70dBm 20dBm nominal 35dBm SdBm The numbered terminal of the input pair phase writh the maximum numbered terminal 07 Ine ouinuDiln Line Input - IOdBm to +8dBm nominal; +25dBm maximum: POWER REQUIREMENTS Booster amplifier input -25dBm nominal, SdBm maximum.

48Vdc regulated 65 ma AMBIENT TEMPERATURE ACCESSORIES: 60OC DIMENSIONS 1.6"W x 6.625"H * 6.5"D WeIGHT 1.5 Ibs. WARD-BECK SYSTEMS LTDE WARD BECk SYSTEMS INC_ B4FO % ~Scorbron Ont Mhi2x4 Lin St Eluttn O Na Yo 14210 Tetchen [4.3i 4388550 ct 6C-2dace NSSos WBS

WBS M441 CHANNEL AMPLIFIER The M441 is a high performance active, balanced channel amplifier for use in Ward-Beck audio control consoles which comprise alternative configurations of plug in modules The channel amplifier incorporates microphone and line level inputs , sens itivity control, reverberation, selector and level control, cue or pre-hear pushbutton and illuminated channel on alternate action pushbutton_ PREAMPLIFIER FUNCTION MICROPHONE INPUT: -7Odbm nominal, in 5 steps of 10db +15dbm max INPUT NOISE; ~124dBm (10 Hz to 100 kHz) INPUT IMPEDANCE: Unloaded input, 5 X source TOTAL HARMONIC DISTORTION: Less than 0 .

1% from 2OHz to 20kHz at nominal levels Less than 0 . 25% from 2OHz to 2OkHz at maximum levels (before clipping) MAXIMUM OUTPUT : +25dBm (providing 35dB signal headroom at all times from nominal output 1 evel) HIGH LEVEL FUNCTION LINE INPUT: ~lOdBm to +8dBm nominal in 3 steps (calibrated) +24dBm max SIGNAL TO NOISE: (7OaB measured from nominal output level ~80dBm absolute +25dBm (providing 35dB .

signal headroom at all times from nominal output level) MAXIMUM OUTPUT: FREQUENCY RESPONSE : +0 . 2aB from 2OHz to 20kHz POWER REQUIREMENTS : 48V regulated, 5OmA DIMENSIONS : 1.6 X 6.6 * 6 (below, panel) inches