Sonance LR2 - Manual (Page 3)

OTHER SONANCE INDUSTRY UPGRADE COMPONENTS
AL2 and AL2/S Automatic Secondary Source Selector (Line-Level)
The AL2 automatically switches between two line-level stereo sources: a main source connected to the Input A jacks and a remote source connected to the Input B
jacks. When the AL2 senses a remote source signal present at the Input B jacks, that source signal is automatically switched-through to the output jacks. When the
remote source signal is no longer present on Input B, after a short (installer-adjustable) time delay the AL2 automatically switches the outputs to the main source
connected to the Input A jacks. The time it takes the AL2 to switch back to Input A from Input B can be adjusted to suit the different types of audio sources being
used, or the preferences of the listeners. The sensitivity of the detection/switching circuitry is also adjustable to work with a variety of audio source equipment.
The AL2/S is a ‘slave’ unit that operates identically 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.
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 AL2.
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 appli-
cations 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.
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 con-
verter, 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 ter-
minals. 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
L S 2 a n d L R 2 I N D U S T R Y U P G R A D E
BALANCED LINE SENDER AND RECEIVER
3