Bogen TBL1S Service Manual

TBL1S

Transformer Balanced
Line Input Module

Features

• Transformer-isolated line level input

• Gain/Trim control

• Bass and treble

• Audio Gating

• Gating with threshold and duration adjustments

• Variable signal ducking when muted

• Fade back from mute

• 4 levels of available priority

• Can be muted from higher priority modules

• Can mute lower priority modules

• Pluggable screw terminal strip

Printed in Taiwan.
© 2007 Bogen Communications, Inc.

54-2084-01D 0704
Specifications subject to change without notice.

Gain

Provides control over the level of input signal that can be applied to the
internal signal buses of the main unit. Allows a way to balance the input
levels of various devices so that the main unit controls can be set to
relatively uniform or optimum levels.

Treble (Treb)

The Treble control provides +/- 10 dB at 10 kHz. Clockwise rotation provides
boost; counterclockwise rotation provides cut. Center position provides no
effect.

Gate - Threshold (Thresh)

Controls the amount of input signal level necessary to turn the module’s
signal output on and mute lower priority modules. Clockwise rotation
increases the necessary input signal level required to produce audio output
and mute lower priority modules.

Gate - Duration (Dur)

Controls the amount of time the signal output and priority muting of the
module remains applied to the main unit’s buses after the input signal falls
below the required minimum signal level (set by the threshold control).

Ducking (Duck)

Controls the module’s output level when the module is muted or gated.
The range is adjustable from no reduction in level to full muting of the out­put signal.

Module Installation

1. Turn off all power to the unit.

2. Make all necessary jumper selections.

3. Position module in front of any desired module
bay opening, making sure that the module is
right-side up.

4. Slide module on to card guide rails. Make sure
that both the top and bottom guides are
engaged.

5. Push the module in to the bay until the faceplate
contacts the unit’s chassis.

6. Use the two screws included to secure the mod­ule to the unit.

WARNING:
Turn off power to unit and make all jumper
selections before installing module in unit.

Jumper Selections

Priority Level

*

This module can respond to 4 different levels of
priority. Priority 1 is the highest priority. It mutes

modules with lower priorities and is never muted.
Priority 2 can be muted by Priority 1 modules and

can mute modules set for Priority Level 3 or 4.
Priority 3 can be muted by either Priority 1 or 2

modules and can mute Priority 4 modules. Priority
4 modules are muted by all higher priority mod­ules. Remove all jumpers for “no mute” setting.

* The number of priority levels available is determined

by the amplifier the modules are used in.

Gating

Gating (turning off) of the modules output when
insufficient audio is present at the input can be
disabled. Detection of audio for the purpose of
muting lower priority modules is always active
regardless of this jumper setting.

Bus Assignment

This module can be set to operate so that the
mono signal can be sent to the main unit’s A bus,
B bus, or both buses.

Balanced Input

Transformer balanced, line-level input on pluggable screw terminal strip.

Bass

The Bass control provides +/- 10 dB at 100 Hz. Clockwise rotation provides
boost; counterclockwise rotation provides cut. Center position provides no
effect.

Impedance Selector

This module can be set for two different input
impedances. When connecting to a 600-ohm
source, it is desirable to have a 600-ohm matching
input impedance. For typical source equipment,

use the 10k-ohm setting.