Xantech RAT 1 Installation Instructions Manual
INSTALLATION INSTRUCTIONS
RAT1
REMOTE AUTO TRANSFORMER
The RAT1 is an infrared remote controlled stereo
speaker volume control with impedance matching
capability. It allows individual volume control of from
one to 16 pair of stereo speakers from one stereo
power amplifier, using one RAT1 for each stereo
speaker pair. It is controlled with any Xantech IR
Receiver or keypad or with Xantech MIRV1 motorized
volume controls. The RAT1 maintains correct impedance matching between the amplifier and the speakers with the use of instant setting S1 to S8 jumpers,
located on the unit. This eliminates the need for
separate impedance matching devices in multi-room
installations.
FEATURES AND SPECIFICATIONS
• 10-position relay driven stepped auto transformer design.
• Tri-Fi™ winding system for highest quality audio performance.
• Amplifier Input: 4-screw plug-in connector.
• Speaker Output: 4-screw plug-in connector.
• IR, STATUS & +12V: 4-screw plug-in connector.
• STATUS Input Jack: 2.1mm coaxial type.
• POWER Input Jack (+12V): 2.1mm coaxial type.
• Power Consumption: 300 mA @ +12V DC. Use Xantech Model 786-00 or 782-00 Power Supply.
• Requires IR commands from the RC68+ (or RC68) Programmer or from the MIRV1, for volume
operations.
2
• Using the RC68+ Programmer, internal E
PROM can be set to different group codes for independent
operation of RAT1's when on a common IR bus.
• Factory preset Group Code number is 30.
• Independent grounds between channels.
• 75 watts per channel music power, 25 watts per channel continuous.
• Frequency response: 20 Hz - 20,000 Hz ±1 dB at 1 Watt power input.
• Attenuation: 10 steps at 3 to 6 dB per step, 35 dB maximum.
• Impedance Multiplier Settings: S1, S2, S4, & S8.
• Plug-in connectors accept wire sizes from 24 to 12 gauge.
• "Flat Pack" design permits easy mounting.
• Dimensions: 8" x 4-1/8" x 2-5/8" (203mm x 105mm x 67mm).
RAT1
REMOTE AUTO TRANSFORMER
IR IN
STATUS
POWER
STATUS
12VDC
Fig. 1 The RAT1
GND
+12 VDC
AMPLIFIER
INPUT
SPEAKER
OUTPUT
L+ L– R– R+L+ L– R– R+
S8S4S2
S1
Speakers & Volume Controls
1
RC68 PROGRAMMER / REMOTE CONTROL
The RC68+ (and the RC68) programmer (available separately) contains all the commands necessary to
operate the RAT1.
• You will need it to program universal learning devices such as the Xantech URC-1 learning remote, the
Xantech Smart Pads, the 590 Programmable Controller, the 710 Fone Link, etc., with commands that
operate the RAT1.
• NOTE: The RC68+ codes operate several other Xantech models as well, such as the RS41AV, CC12,
only
ZPR68, MIRV1, etc. Therefore,
the button descriptions that apply to the operation of the RAT1 are
listed below. All others should be ignored.
CAUTION: While the RC68+ can be used as a handheld remote control, it is highly recommended it not
be given to the final user for the following reasons:
• Since it includes selectable code groups, the user may inadvertently alter the installer configurations.
• Since the user will require IR commands from other brands of equipment to control the total system, in
addition to those of the RAT1, all commands should be consolidated into one learning device for easy use.
APPLICABLE RC68+ BUTTON DESCRIPTIONS
1. IR Emitter Lens
2. Instant Volume Presets. These buttons allow direct preset activation of any of the 10 volume steps
on the RAT1. Useful for "audio scene" ambiance settings for rooms or an instant partial mute action.
The relationship of the RC68 buttons to the RAT1 volume step positions is as follows:
RC68+ Button RAT1 Volume Step #
A, B, C 1 (OFF, MIN. VOL)
ADJ-OFF 2
13
24
35
46
57
68
Fig. 2 The RC68+
Programmer
5
1
A B C ADJ-OFF
80 48 10 90 01
1234
00 C0 50 D0 41
INPUT
5678
40 A0 30 B0 21
GLOBAL
20 E0 70 F0 61
TREBLE
BASS
VOL
Z-ADJ
60 88 18 98 09
MUTE
08 A8 38 B8 29
ON OFF
28 E8 78 F8 69
E-FLAT LAST MAX-V TRIM
68 C8 58 D8 49
OFF C-BAL
E1 89 C9 A9 E9
71 19 59 39 79
F1 99 D9 B9 F9
A
79
8 10 (MAX VOL)
3. VOLUME Up/Down buttons. Each individual press will cause the RAT1 to
RC68+ PROGRAMMER
increase or decrease volume level by one step, over a total of 10 steps. Each step causes a change
of 3 to 6 dB. A maximum attenuation of 35 dB occurs at the lowest active step (#2). The lowest step
(#1) switches the signal off. When buttons are held down, volume level changes continuously.
4. MUTE ON/OFF. Separate ON / OFF buttons mute and release the signal without knowing what the
status is. This is very helpful in a remote room when all adjustments are made “blind” without any visual
aid for status.
NOTE: Mute is released (turned off) when a VOLUME or Preset Level button is pressed, in addition
to MUTE OFF.
5. Code Group Numbers. If more than one RAT1 is used on a common IR controlled bus, or is included
with other Xantech products that respond to RC68+ commands, different Code Groups can be
assigned, by the installer, to avoid mutual interaction. Refer to the RC68+ instructions for Code Group
setting procedures.
NOTE:
When shipped from the factory, the RAT1 is set to Code Group number 30. Be sure to
set the RC68+ to the same number!
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RAT1
2
3
4
SETTING THE IMPEDANCE MATCHING JUMPERS
The impedance matching jumpers are located under a clear mylar cover on the right side of the top of the
unit. Remove the two screws for access. The proper placement of these jumpers depends on the number
of RAT1's and speakers used in the total installation. To set them for the best impedance matching
condition, refer to the following charts and procedures:
WHEN USING 8 OHM SPEAKERS
Min. Amp.
Impedance
4 Ohms
8 Ohms
WHEN USING 4 OHM SPEAKERS
Min. Amp.
Impedance
4 Ohms
8 Ohms
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
S1 S1
S1 S2 S4 S4 S8 S8 S8 S8
Number of Speaker Pairs Used
1 2 3 4 5 6 7 8
S1 S2
S2 S4 S8 S8
S2 S2 S4 S4 S4 S4 S8 S8 S8 S8 S8 S8 S8 S8
S4 S4 S8 S8 S8 S8
Number of Speaker Pairs Used
Procedure for all 4 Ohm or all 8 Ohm Speakers
1. Determine the rated speaker impedance (refer to the manufacturer's specifications - it must be the
same for all speakers used in the system).
2. Determine the total number of stereo speaker pairs used in the installation.
3. Determine the minimum safe amplifier operating load impedance (refer to the manufacturer's
specifications).
4. Find the correct jumper position from the above charts.
5. Place the jumpers
in the same position on each RAT1 used in the system.
Example 1:
13 pairs of 8 Ohm wall speakers are to be used with 13 RAT1's in a 13 room system, all driven by one
amplifier rated for 4 Ohms minimum safe operating load impedance.
1. Refer to the chart "WHEN USING 8 OHM SPEAKERS".
2. Locate the number 13 in the top row.
3. On the next row, opposite "4 OHMS" and just below "13", note the letters "S8". These signify the
required impedance multiplier.
4. The two jumpers therefore, one for each channel, need to be plugged onto the
S8 pins on each RAT1
that feeds each room.
Example 2:
3 pairs of 4 Ohm wall speakers are to be used with 3 RAT1's in a 3 room system, all driven by one amplifier
rated for 8 Ohms minimum safe operating load impedance.
1. Refer to the chart "WHEN USING 4 OHM SPEAKERS".
2. Locate the number 3 in the top row.
3. On the third row, opposite "8 OHMS" and just below "3", note the letters "S8". These signify the
required impedance multiplier.
4. The two jumpers therefore, one for each channel, need to be plugged onto the
S8 pins on each RAT1
that feeds each room.
Speakers & Volume Controls
RAT1
3
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