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Summary of Contents for TW LP4 S
- Page 1 ELECTRONIC COMPONENTS LP4 S USER MANUAL TW LP4S (Location Production) stereo microphone mixer is a compact portable four-channel unit designed for electronic news gathering (ENG) quality sound mixing in a motion picture or television film.
- Page 2 LEFT SIDE PANEL Balanced channel inputs – four electronically balanced circuits (transformer balanced is optional) in phase with one another. XLR connectors should be wired as pin1 ground, pin2 +phase signal and pin3 – phase signal. Microphone powering selector switches – The input sensitivity in position D is DYN 200 = 0.2 mV and no power.
- Page 3 FRONT PANEL Modulometers – Continuous lighting, peak reading, BBC 1-7, dB or VU scaling, built-in red LEDs indicate when the gain reduction is occurring with the limiters switched on. Battery check pushbutton 6.3 and 3.5 mm phone jacks Monitor selector switch – ST stereo. L+R sum signals, phase check, MS stereo equivalent Left. L–R difference signals MS stereo equivalent Right.
- Page 4 RTN2 the returns of XLR7 will be fitted by the monitoring circuits. Power supply – The DC power stabiliser of TW mixer has built-in Poly-Fuse to protect the unit. If a problem occurs that trips this fuse, it will reset after the power supply is diconnected for about 15 seconds.The mixer may be powered by 12 pieces internal AA size rechargeable batteries or an external DC...
- Page 5 ADJUSTMENT POINTS Gain and modulometer adjustment – Connect an AC voltmeter to the Left balanced line output. Set channel 1 pan switch to L position, turn channel 1 fader fully clockwise, Master potentiometer in 0 dB position and switch LFA off. Connect an audio generator 1 kHz 0 dBm attenuator –80 dB to Mic 1 Input and adjust TRIM in the Left Limiter amplifier to obtain 0 dBu (+4 dBu on VU metered mixers) at the Left balanced output.
- Page 7 SPECIFICATIONS Inputs Microphone: four transformerless XLR female Sensitivity: –75 dBu Maximum input level: –20 dBu Microphone power: 48 V, 12 V, T (DIN AB) Line attenuation: adds 60 dB attenuation before the mic preamp. Signal to Noise ratio: > 65 dB, Equivalent Input Noise: –125 dBu Frequency response: 20 Hz - 20 kHz ±2 dB Harmonic distortion: less than 0.2 % Low-cut filter: 80/100 Hz / 14 dB octave...
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