User manual

ALM26 Series User Manual P/N 821644 Rev-A

Please refer to Figure-2b on the following page to familiarize yourself with the rear panel features of the ALM26 Series units

covered by this manual. The following sections describe these features and are referenced, by letter, to Figure-2b.

Rear Panel Features

Section 2: Operation

(Continued)

Digital (AES) Audio Inputs

(ALM26-nnD Only)

Each input connector receives an AES digital signal from which two channels are derived.

Phoenix Connectors (Standard)

These Phoenix (or XLR) connectors are configured for a balanced (110 Ω impedance) connection. Channel numbers are

displayed on a label to the side of each connector and correspond to the channel numbers above the associated LED

indicators on the front panel. Connector pinout information is silk-screened just below each connector.

BNC Connectors (Optional)

These BNC connectors are configured for an unbalanced (75 Ω impedance) connection. Channel numbers displayed

on a label above or below each connector and correspond to the channel numbers above the associated LED indicators

on the front panel.

Digital AES Termination, Reference Level, and Display Mode DIP Switch

(ALM26-nnD Only)

This DIP switch sets the Termination for the input connectors, and the bargraph Display Mode and Reference Level for the

associated bargraph displays. Each DIP switch module affects only the four channels (two input connectors) within the

section in which it is located. See the descriptions and diagram below for setting information.

Termination:

Switch sections 1 (left connector) and 6 (right connector) respectively set the termination for the connector inputs in each 4-

channel input section. The respective DIP switch section should be moved to the UP position to UNTERMINATE the

connector if the input signal is fed to downstream equipment. The respective DIP switch section should be moved to the

DOWN position to TERMINATE the connector if the input signal is not fed to downstream equipment. The factory default

setting is TERMINATED for each input connector. See diagam below for settings.

Reference Level:

DIP switch sections 2 and 3 determine the Reference Level, which adjusts the level of the input signal and the resultant level

displayed on the LED bargraphs. Factory setting is -20 dBfs. See diagam below for settings.

Bargraph Display Modes:

DIP switch sections 4 and 5 determine how peak levels are displayed for the four associated meters on the front panel. There

are four possible settings; VU Bargraph Only, VU Bargraph with PPM Floating Segment, PPM Bargraph Only, and

PPM Bargraph with PPM Floating Segment. The factory default setting is VU Bargraph with PPM Floating Segment.

See diagam below for settings. See the ALM26 Internal Settings - Address, Peak Hold, PPM Characteristics diagram

on page 23 for how to set the Peak Hold and PPM Ballistics characteristics.