User manual

AMP2A-VTR and AMP2A-VTR2 User Manual P/N 821580 REV-B

Please refer to Figure-2a on the following page to familiarize yourself with the front panel features of the AMP2A-VTR and

AMP2A-VTR2 units. The following sections describe these features and are referenced, by number, to Figure-2a.

Front Panel Features

Section 2: Operation

Speakers

All AMP2 Series models feature two mid-range speakers (left and right) and one woofer speaker. Two amplifier/driver

combinations handle midrange and high frequency information in the left and right (stereo) speaker channels, while the third

channel reproduces and sums the left and right channel information below the 500 Hz crossover point in the woofer (bass)

speaker(s). Note that the woofer channel is NOT a dedicated LFE (subwoofer) or Center channel. See page 14 for more

information concerning the AMP2 Series audio amplifier/speaker configuration.

Power LED

This LED glows GREEN to indicate the unit is connected to mains power and an operation voltage is present.

Audio Level Meter LED Bargraph Displays (1-4)

These four tri-color LED bargraph level meters display audio levels for the four audio signals entering the AMP2A-VTR

unit or, in the case of the AMP2A-VTR2 unit, the four channels selected by the Group Select Switch (Item 10, page 10).

All bargraph LED segments are of the tri-color type (green, amber, red) and are user adjustable for Referrence Level,

Display Mode, Peak Hold, PPM Ballistics, Alternate Bargraph Scales, and Phase Correlation via DIP switches on

the rear panel and inside the unit. For factory set and user adjustable level meter DIP switch settings, see pages 17 and 18.

For more information about the Phase Correlation feature, see page 20. For meter specifications, see page 5.

Volume Control Pot

This controls the loudness of the audio reproduced by the internal speakers or connected headphone. Clock-wise rotation

of this control increases the loudness of the monitored audio in both speaker channels.

Headphone Jack

This jack accepts a standard 1/4” phone type stereo plug. When you plug in headphones, the speakers will mute.

Speaker Assign Channel Buttons (Left and Right)

Use the left bank of four buttons to assign one to four of the four available channels for monitoring from the left speaker

channel. Use the right bank of four buttons to assign one to four of the four available channels for monitoring from the

right speaker channel. Channel buttons toggle On/Off and will light up BLUE to indicate they are selected.

Operation for channel selection for each bank of four buttons is as follows:

Single Channel Select: Press and release a single channel button to select that channel (and deselect any previous

selection). Pressing and releasing the selected channel button again will deselect it.

Multi-Channel Select (Summing): Press and hold down a desired channel button, then press other channel buttons

to add (sum) additional channels (or press any again to deselect). Release all buttons to accept the selection set. When

multiple channels are selected, pressing and holding an already selected channel button will allow further modification to

the selection set. Releasing all buttons accepts the new selection set. Pressing and immediately releasing an already

selected channel button will select only it and deselect all other channel selections.

If the user presses a previously selected (lighted) channel button, but then decides not to make any changes to the selection

set, the user should keep the button depressed for at least 1.5 seconds before releasing it. This will preserve the current

selection set as though the button was never pushed.

Bargraph Brightness Trim Pot

This control is recessed into the front panel and can be accessed using a small screwdriver. Turning it clockwise will

increase the relative brightness of the bargraph display LED segments. Adjusting this one control will simultaneously affect

the brightness of all bargraph displays on the front panel.

(Continued)