4ms Company Listen Four Kullanıcı Kılavuzu - Sayfa 4

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Left and Right Output Jacks

The main outputs of the module are the left and right output jacks. The signal level on these

jacks is controlled by the

a zero-impedance line driver circuit capable of driving long cables. They also can be patched

to other modules or an external DAW interface. The jacks are mono 1/8" (3.5mm).

While it is safe to use an adapter to convert to 1/4" (6.35mm), consider using the

Quarters

Output Signal Lights

The two lights near the output jacks indicate the signal level present on these jacks. The top

light turns blue more brightly as the left channel output gets louder. If the left channel clips, a

bright red light will add to the blue, creating purple. The lower light turns green more brightly

as the right channel output gets louder. If the right channel clips, a red light will add to the

green, creating yellow. The clipping level can be set with the trim pot on the back of the

module (see Trim Pot section). When the switch is

set to Line, no clipping can occur and these lights will

never turn yellow or purple.

Mod/Line Switch

The

occurs on the main output jacks. When set to Mod,

modular level signals are output (+/-12V). When set

to Line, line level signals are output. To protect your

speakers, power off the Listen Four or disconnect the

speakers before flipping this switch.

Headphones Output

Headphones Jack

The headphones jack is a stereo 1/8" jack (3.5mm) designed for outputting to headphones.

Any headphones can be used, though 8 to 32 ohms is recommended. The jack can also be

used as an additional output to connect to an external device that requires a TRS stereo

signal. However, use the main outputs if possible because the frequency response and noise

specifications of the headphones output are not as good as the main output jacks, and this

output does not have the anti-pop circuitry.

Headphones Level Knob

This knob sets the headphones volume. It's independent of the

Mod/Line

Trim Pot (Clipping Light Level)

A small trim pot on the back of the module adjusts the level at which the clip lights turn on

(see Output Signal Lights section above). The factory default setting is for the lights to turn

bright yellow or purple when the output signal exceeds about 20V peak-to-peak. When the

trim pot is turned all the way counter-clockwise, the clip lights will almost never turn on, even

though substantial clipping may be occurring. By turning the trim pot further clockwise, the

clip level can be adjusted as low as 13.3V (-4.4dB).

To adjust the clipping level, use a #1 Phillips-head screwdriver and gently turn the inner shaft

of the trim pot. If you feel any resistance, stop turning

immediately: the trim pot can be easily damaged.

Turning clockwise will decrease the level (clip light

turns on sooner). Turning counter-clockwise will

increase the level.

The trimpot only adjusts the visual feedback from the

clipping lights. It does not change the actual clipping.

Main Level

module, which has balanced 1/4" outputs.

Mod/Line

switch selects what type of output

switch.

knob as well as the

Page

Mod/Line

switch. These jacks have

Note: T he signal lights only indicate

relative dynamics. Pulsing

lights often indicate beats or

throbbing sounds. It's normal

that the blue lights are

brighter than the green lights

at softer volumes.

Main Level

knob and the

Tip: After adjusting the trim pot,

make sure the switch is set

to Mod when you test the

new level: no clipping ever

occurs with the switch set

to Line!

Listen Four