FRONT PANEL
4 / 4 switch – The TW LP444s 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 su6 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.
