Sonance Industry Upgrade Automatic Secondary Source Selector AL2/S - Manual (Page 3)

Using the AL2 Control Output with Multiple Slave Units
The AL2’s Control Output can supply up to 200mA of current. This allows it
to be daisy-chained with up to five (5) AL2/S slave units.
CONNECTING THE AL2/S
(see Illustration 5 )
The AL2/S is a ‘slave’ unit that operates similar to the AL2, except that its input
switching is controlled by an external control voltage source. In most systems
the control voltage will be supplied by the Control Output connector of an
AL2 unit, but any 12V source (with a minimum of 40mA of current) that
switches on and off can be used as a control trigger.
1. Connect the left & right line outputs of the main (default) source to the
AL2/S’ Input A jacks; connect the left & right line outputs of the remote
source to the AL2/S’ Input B jacks (see Step 1 of Connecting The AL2).
2. Connect the AL2/S’ left & right Outputs to the inputs of the system’s
amplifier, preamp/controller or receiver.
• If you’re using the AL2/S to switch a composite video signal connect its
Output jack to the TV or other video equipment.
3. Connect the switching 12V source to the AL2/S’ Control Input connector.
• You can use any 2-conductor wire (16ga ~ 22ga) to connect the AL2/S
Control Input terminals to the Control Output terminals of an AL2.
Caution: Do not short the ‘+’ and ‘–’ terminals together on the AL2 or
AL2/S Control Outputs/Inputs.
SPECIFICATIONS
Power Consumption (AL2): 90mA ±5% @ 12VDC
Power Consumption (AL2/S): 40mA ±5% @ 12VDC
Dimensions (W x H x D): 4” x 2” x 3” (102mmx 51mm x 76mm)
OTHER SONANCE INDUSTRY UPGRADE COMPONENTS
AVL1 Automatic Audio/Video Source Selector
The AVL1 provides automatic stereo line-level audio and composite video
switching between two audio/video sources (such as a VCR, cable TV tuner or
DVD player). Features and operation are otherwise identical to the AS2.
AS2 and AS2/S Automatic Secondary Source Selector (Speaker-Level)
The AS2 and AS2/S function identically to the AL2 and AL2/S except that they
switch speaker-level audio signals instead of line-level audio signals. Typical
applications would be switching a whole-home audio system and a local
television to a single pair of speakers, or as a ‘break-in’ device for paging
applications. Features and operation are identical to the AL2 and AL2/S,
except the AS2 and AS2/S operate at speaker level.
LS2 and LR2 Balanced Audio Sender and Receiver
The LS2 and LR2 the most efficient and highest-quality way to distribute
audio throughout a residential or commercial system. The LS2 converts
typical line-level audio signals to balanced configuration, allowing them to be
sent long distances and in close proximity to sources of noise interference
without inducing noise or high-frequency roll-off.
As a general rule of thumb, a balanced signal should be used for all but short
lengths of audio cable (under 20 feet) and wherever the possibility of signal
interference is likely. This includes where the audio signal passes near dim-
mers, transformers, fluorescent and neon lights, or along the same pathways
as house current.
Active circuitry in the LS2 sends the balanced signal to the LR2, which
converts it back to an unbalanced line level signal that can be connected to the
audio component. The LS2 and LR2 must always be used with each other
unless the audio equipment has balanced inputs or outputs (such as profes-
sional sound or recording equipment). In this situation the LS2 could be used
as an unbalanced-to-balanced converter and the LR2 could be used as a bal-
anced-to-unbalanced converter. The LS2 can also be used with the 275 SE and
ASAP2 SAT amplifiers with an LR1 SAT module (part# 91815) installed.
VT1 Video Trigger
The VT1 provides a 12V DC signal when a video sync pulse is detected
(picture or blue screen). This can be useful in triggering any component
requiring a 12V signal. An LED indicates when the unit is active. A detachable
12V DC power supply is included.
RFGI1 Radio-Frequency Ground Loop Isolator
A passive device, the RFGI 1 is used to break a ground loop that can occur
when using a cable TV or antenna feed along with AC system grounding. The
RFGI1 blocks low frequency and DC by capacitor-coupling the shield and the
center conductor of any RF cable connected through it. This prevents the
occurrence of low-frequency humming and TV screen hum bars. The RFGI1
connects between the main cable TV feed and the cable distribution box, RF
amplifier, cable converter, VCR or TV. F-connections are used on each side for
a secure and reliable termination. Because it does not allow any RF leakage,
the RFGI1 is a superior termination compared to a 75-to-300-to-75 ohm
balanced connection.
OP3 Output Pad
Attenuates a stereo speaker-level signal to a stereo line-level signal. Can be
used to create an additional preamp signal from any amplifier or receiver
speaker terminals. Can also be used to add line-level output capability to a TV
with only external speaker leads. Use in conjunction with a 2-female to 1-male
Y-cord to sum left and right channels for monaural applications.
I N S T R U C T I O N M A N U A L
A L 2 a n d A L 2 / S I N D U S T R Y U P G R A D E
AUTOMATIC SECONDARY SOURCE SELECTOR
3
R LR L
R L
CONTROL INPUT
12VDC 100mA
INPUT A INPUT B
OUTPUT
SLAVE, LINE LEVEL
AL2/S
+ –
Output
Remote
Input
Main
Input Control
Input
Illustration 5: AL2/S Connections and Controls