ZT LBA1 Owner's Manual download pdf (Page 7)

Feedback Cut:

The LUNCHBOX Acoustic’s FEEDBACK CUT feature is designed for a quick, simple elimination

of feedback. The FEEDBACK CUT is a master control that affects both Microphone and

Instrument channels. When FEEDBACK CUT is set to Off, the LUNCHBOX Acoustic delivers it’s

normal EQ curves. Positions 1, 2, and 3 target specic frequencies that are common feedback

offenders. Each different knob position carves a notch in a different frequency. This feature is not

guaranteed to solve every feedback problem in every environment, but we have found it to be very

effective in most situations. (Hint: If you are playing your acoustic guitar close to and facing the

amplier at a high volume, you will experience feedback. Move away from, or turn the instrument

away from the amp.)

AUX Input:

The LUNCHBOX Acoustic can accept a stereo line input from an audio source such as a PC, CD,

or MP3 player via a standard

8” Stereo jack on the rear panel, labeled AUX INPUT. This input

is only affected by the master VOLUME control; no other signal processing is applied (unless

you’re going thru the EFX loop). To adjust the relative balance between your guitar or microphone

and your MP3 player, you can use the GAIN controls and the output volume on your player. We

recommend that you disconnect any cables from the AUX INPUT when it is not in use.

EFX Loop:

Allows effects to be inserted after the input stage, resulting in a cleaner, more dened output

signal under many conditions. The Send/DI output can also be used as a direct output to a

powered system such as another amplier or a P.A. However, plugging into the EFX Return will

interrupt the LUNCHBOX Acoustic’s internal signal path (except for the master VOLUME), so that

the sound can be sent to, and received from, your effects rig. Be aware that any effect connected

via the EFX Loop will be applied to both Microphone and Instrument channels on the LUNCHBOX

Acoustic.

Headphone/Line Level Output:

This ¼” Stereo connector can be used to run most stereo headphones. (However, the signal

itself is always mono.) The line output is also useful for running into house sound, or a recording

rig. It has its own level adjustment, so that you can adjust the level of your phones once the

LUNCHBOX Acoustic controls are set where you want them.

Unlike most headphone outputs, this one doesn’t mute the internal speaker. If you want to do that,

just set the SPEAKER switch to External. This approach gives you total control of what is on or off

at any given time. For example, you can use the LUNCHBOX Acoustic to monitor the sound on

stage, even when routing into the board via the line out.

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ZT LBA1 Owner's Manual Page 7