TW Electronic Components LP444 User Manual
ELECTRONIC COMPONENTS
LP444
USER MANUAL
TW LP444 is a compact portable 4 in / 2 out and switchable
4 in / 4 out unit designed for four-track recorder or camera.
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. Selected 48, 12, T, mic powering, 10 dB of attenuation is automatically introduced,
considering the sensitivity of condenser mics.
Phase reverse switches – Intended to compensate for a phase error due to wiring or mic
placement.
Phantom on / off switch – The current consumption of the phantom power supply is 13 mA.
Phantom power supply may be switched off (only if using dynamic, wireless of T powering mics) to
increase the lifelength of the internal batteries between two chargings.
Attenuation switches – The gain of the mic preamplifiers may be decreased by –10 dB in position
D. In positions 48, 12 and T the attenuation is –13 dB.
Mic / line level switches – Selects mic or line to add –60 dB attenuation before the mic
preamplifiers.
Optional NP1 Battery Holder – The switched mixer supply is derived either from the internal AA
batteries or from NP1 battery depending on the position of the panel side switch.
FRONT PANEL
4 / 4 switch – The TW LP44 mixer works in stereo mode when this switch is turned down. Turned to
4 / 4 position, channel 1 Pan switched in L, channel 2 in R, the four inputs can be controlled
independently by the channel faders to the four outputs.
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.
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. MS matrix, MS stereo equivalent. R right channel. L
left channel. Channels L and 3, channels R and 4 are linked for the monitor circuit in 4 / 4 mode.
Phones volume control – Output voltage into 50 Ω adjustable from 20 to 500 mV.
Limiters on / off switches – The four individual limiters have fast attack time (less than 1 msec) and
a slow release time to smooth operation. Two red LEDs are built in the meters to indicate – depending
on meter selector switch – when the limiters are selected and gain reduction is occurring. Threshold is
internally set to +6 dBu at the balanced output. To adjust the limiter threshold for a value different from
the supplied +6 dBu, see page ADJUSTEMENT POINTS.
Battery check pushbutton – R meter shows the battery status 6/full 5/power LED starts to blinking
and after the battery gets empty.
Reference generator switch – 1 kHz sine wave signal is fed to all four outputs and the level can be
controlled at L and R outputs by the Master control but channel 3 and 4 outputs are internally set to
0 dB.
Slate microphone – It can be used either for identifying recorded segments or as an emergency
field microphone.
Low-cut filter switches – Low frequency attenuation is 14 dB / octave at 100 Hz.
Pan switches – Assign selected input signal to Left or Right output. In M position, equal amount of
signal is sent to Left and Right outputs. The S position of Pan switch 1 assigns Channels 1–2 as a
stereo pair controlled by Channel 1 Fader.
Channel gain controls
Pre-Fade Listen pushbuttons – Each channel can be checked by monitoring. Output audio signal
is not interrupted when the PFL pushbutton is activated.
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