Digital audio ACHAPELL AUDIO 992EG Panduan Pengguna - Halaman 8

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• OUTPUT GAIN: OUTPUT GAIN: Provides variable control over line level signal strength. Think of this

control as your source for clean gain. Typically, this control is used to establish the desired line

level after the input gain has been set but it can work interactively with the INPUT for a wide array

of tonal possibilites. The pot is placed between the last input tube and the first 12AU7 output tube

and provides all remaining amounts of gain from the input stage.

• POWER TOGGLE: Controls the on/off power and is slave

to the rear main rocker switch.

CHANNEL SPECIFIC TOGGLES

• METER: The VU meter is buffered from the audio path

using high impedance precision isolation amplifiers.

Use of a meter isolation amplifier is important for

maintaining consistent gain and eliminating IMD

regardless of the meter status (on/off). However, it is

strongly recommended that the user switch off the

meter when it becomes 'pegged', overdriven. This

prolongs the life and accuracy of the meter.

• 48V (Phantom): 48 volts are available for condenser microphones. Each 992 is calibrated to

exactly 48 volts at the input jacks at final assembly. It is important that you NOT engage the

front panel 48v toggle with microphones that do not require it: ribbon, dynamic, and tube mics.

Applying 48v from any source (not just this preamp) to some of these microphones can damage

or destroy them.

• -20dB: If needed the user can pad the microphone inputs using the -20db attenuator. This

adjustment takes place before the first input tube. This function is defeated while the Hi-Z inputs are

engaged.

• POLARITY REVERSE: Some of the more common reasons to use this would be to reduce feedback

in a live environment, enhance the stereo image of certain content or to assist in eliminating

headphone signal bleed through during a recording session.

• MUTE: Each channel is equipped with its own mute function. The LED indicates the mute function

is engaged; output signal is completely cut. However, the meter will still monitor the output level

whether mute is engaged or not (unless it too is switched off.)

LACHAPELL AUDIO MODEL 992

CREATIVE TIP:

For near transformer-less sound,

consider engaging this pad function

and compensate for the loss of gain

by increasing the input gain control.

This approach effectively minimizes

the gain coming from the Jensen

input transformer while drastically

increasing the character of the

vacuum tube (this is only possible

with the microphone path).