Russound TBL-75 User manual

ussoun
TBL-75
Table-Top Volume Control
Instruction Manual
®
ussoun
TBL-75
Table-Top Volume Control
Instruction Manual
®

2
INTRODUCTION
The TBL -75 Volume Control is afree-standing stereo speaker-level volume control with
a
front panel headphone jack and buitt-in impedance-matching options. It connects
between the
speaker outputs of an amplifier or receiver and a pair of speakers. The
TBL -75 adjusts the volume of the speakers connected to it by adjusting the signal from
the amplifierto the speakers.
The TBL-75 is ideal for private listening as its tabletop design is suitable for placement
on adesk or bedside stand. When headphones are connected through the headphone
jack, it interrupts the speaker output, and the volume knob then controls the headphone
audio
levels.
When using the TBL-75 in installations with more than one pair of speakers or with
additional volume controls, the TBL -75 has a rear panel impedance selector switch to
be
set at 1 X, 2X, 4X and ax. The 1X setting allows the volume control to be used as a
standard control. The 2X, 4X, and ax settings allow it to be used as an UltraMatch™
impedance matching volume control. The UltraMatch ™ volume control matches the
minimum output impedance ofthe amplifier or
receiver, in addition to adjusting volume.
It eliminates the need for a speaker selector or additional impedance matching equip-
ment.
PROPER SELECTOR SWITCH SETTING FOR IMPEDANCE MATCHING
By determining the drive capability of the amplifier with a few simple calculations, you
can determine the number of speakers the system can safely operate.
The selector switch must be set in aposition that correctly multiplies the impedance of
the system to a
level that is equal to or greater than the impedance of the amplifier.
The switch setting can be determined using the following simple steps:
1. Determine the amplifier1s minimum impedance. The amplifier's minimum impedance
is usually found following Wattage and Frequency Response in the amplifier's speci-
fication
page of the manual. It may also be listed on the back panel ofthe amplifier
near the speaker terminals. The impedance value is expressed in ohms.
2. Identify the correct impedance-matching chart according to the amplifier's minimum
impedance.
There are two impedance matching charts, one for aohm amplifiers
and one for 4 ohm amplifiers. Choose the chart that describes your amplifier. If your
amplifier
is 6 ohm stable, use the aohm chart.
3. Determine the impedance for each pair of speakers by referring to its manual.
4. Determine the total number of 4ohm pairs of speakers. (rows on charts) If using 6
ohm speakers, treat them as 4ohm speakers
5. Determine the total number of 8ohm pairs of speakers. (columns on charts)
2
INTRODUCTION
The TBL -75 Volume Control is afree-standing stereo speaker-level volume control with
a
front panel headphone jack and buitt-in impedance-matching options. It connects
between the
speaker outputs of an amplifier or receiver and a pair of speakers. The
TBL -75 adjusts the volume of the speakers connected to it by adjusting the signal from
the amplifierto the speakers.
The TBL-75 is ideal for private listening as its tabletop design is suitable for placement
on adesk or bedside stand. When headphones are connected through the headphone
jack, it interrupts the speaker output, and the volume knob then controls the headphone
audio
levels.
When using the TBL-75 in installations with more than one pair of speakers or with
additional volume controls, the TBL -75 has a rear panel impedance selector switch to
be
set at 1 X, 2X, 4X and ax. The 1X setting allows the volume control to be used as a
standard control. The 2X, 4X, and ax settings allow it to be used as an UltraMatch™
impedance matching volume control. The UltraMatch ™ volume control matches the
minimum output impedance ofthe amplifier or
receiver, in addition to adjusting volume.
It eliminates the need for a speaker selector or additional impedance matching equip-
ment.
PROPER SELECTOR SWITCH SETTING FOR IMPEDANCE MATCHING
By determining the drive capability of the amplifier with a few simple calculations, you
can determine the number of speakers the system can safely operate.
The selector switch must be set in aposition that correctly multiplies the impedance of
the system to a
level that is equal to or greater than the impedance of the amplifier.
The switch setting can be determined using the following simple steps:
1. Determine the amplifier1s minimum impedance. The amplifier's minimum impedance
is usually found following Wattage and Frequency Response in the amplifier's speci-
fication
page of the manual. It may also be listed on the back panel ofthe amplifier
near the speaker terminals. The impedance value is expressed in ohms.
2. Identify the correct impedance-matching chart according to the amplifier's minimum
impedance.
There are two impedance matching charts, one for aohm amplifiers
and one for 4 ohm amplifiers. Choose the chart that describes your amplifier. If your
amplifier
is 6 ohm stable, use the aohm chart.
3. Determine the impedance for each pair of speakers by referring to its manual.
4. Determine the total number of 4ohm pairs of speakers. (rows on charts) If using 6
ohm speakers, treat them as 4ohm speakers
5. Determine the total number of 8ohm pairs of speakers. (columns on charts)

6. Follow the appropriate row and column to determine selector switch settings.
7. Set the selector switch to the correct X setting as determined.
CONSIDERATIONS
1. Make sure that your amplifier has adequate wattage for the number of speakers.
Watts per channel divided by the number of pairs should equal or exceed the indi-
vidual speaker's minimum wattage requirements.
2. It is recommended to use an UltraMatch™ volume control for each room.
3. Every jumper setting must be set on the same setting throughout the system.
4. A minimum speaker load of 4 ohms can be connected to the output of each
UltraMatch™volume control.
Impedance Matching Charts For UItraMatch™
Impedance Matching For 4 Ohm Amplifiers
BOhm Pairs
012345 6 789
10 11 12
13
14 15 16
°-
1X
1X
2X 2X
4X 4X 4X 4X
8X 8X
8X
8X 8X 8X 8X 8X
1 1X 2X 2X 4X 4X 4X 4X 8X 8X
8X 8X
8X 8X 8X 8X
2 2X 4X 4X 4X 4X 8X 8X 8X
8X 8X 8X 8X 8X
3
4X 4X 4X 8X 8X 8X 8X 8X 8X 8X 8X
4 4X 8X 8X 8X 8X 8X 8X 8X 8X
5
8X 8X 8X 8X 8X 8X 8X
6 8X 8X
8X 8X 8X
7 8X 8X 8X
8 8X
Example: The table to the right
shows an a ohm minimum imped-
ance amplifier with 1 pair of 4 ohm
speakers and 3 pair of a ohm
speakers. The chart indicates the
jumper setting should be set at ax.
Impedance Matching For 8 Ohm Amplifiers
BOhm Pairs
_+-0""",+-""",,,-+_2__ _4,"",+_5 ........ 6""-+- __ 7 -+--8-1
~ ° 2X .....;.4,;...;,.X +-8;;;.;...X~8X~8.....;.X..........,;;;.8X~
~ 8X 8X 8X
~ ................
e 8X
.;: _-+---f---+_+--.....I....----I
o ......;;...~~;.......a....;....;....J
~
3
6. Follow the appropriate row and column to determine selector switch settings.
7. Set the selector switch to the correct X setting as determined.
CONSIDERATIONS
1. Make sure that your amplifier has adequate wattage for the number of speakers.
Watts per channel divided by the number of pairs should equal or exceed the indi-
vidual speaker's minimum wattage requirements.
2. It is recommended to use an UltraMatch™ volume control for each room.
3. Every jumper setting must be set on the same setting throughout the system.
4. A minimum speaker load of 4 ohms can be connected to the output of each
UltraMatch™volume control.
Impedance Matching Charts For UItraMatch™
Impedance Matching For 4 Ohm Amplifiers
BOhm Pairs
012345 6 789
10 11 12
13
14 15 16
°-
1X
1X
2X 2X
4X 4X 4X 4X
8X 8X
8X
8X 8X 8X 8X 8X
1 1X 2X 2X 4X 4X 4X 4X 8X 8X
8X 8X
8X 8X 8X 8X
2 2X 4X 4X 4X 4X 8X 8X 8X
8X 8X 8X 8X 8X
3
4X 4X 4X 8X 8X 8X 8X 8X 8X 8X 8X
4 4X 8X 8X 8X 8X 8X 8X 8X 8X
5
8X 8X 8X 8X 8X 8X 8X
6 8X 8X
8X 8X 8X
7 8X 8X 8X
8 8X
Example: The table to the right
shows an a ohm minimum imped-
ance amplifier with 1 pair of 4 ohm
speakers and 3 pair of a ohm
speakers. The chart indicates the
jumper setting should be set at ax.
Impedance Matching For 8 Ohm Amplifiers
BOhm Pairs
_+-0""",+-""",,,-+_2__ _4,"",+_5 ........ 6""-+- __ 7 -+--8-1
~ ° 2X .....;.4,;...;,.X +-8;;;.;...X~8X~8.....;.X..........,;;;.8X~
~ 8X 8X 8X
~ ................
e 8X
.;: _-+---f---+_+--.....I....----I
o ......;;...~~;.......a....;....;....J
~
3

4
TYPE OF SPEAKER WIRE
For most applications, we recommend you use 16 or 18 gauge, stranded copper
speaker
wire for the TBl -75 speaker connections. For wiring runs longer than 100 feet,
14 gauge wire is recommended. Using speaker wire larger than 14 gauge for TBl -75
Volume Controls is not recommended as the wire may not fit into the connectors.
NOTE - Never use solid-core, aluminum or Romex® type wire with volume controls.
When running speaker wires inside walls, most states and municipalities in the U.S.
specify that you must use a special type of speaker wire. Usually, the requirement is
that the wire has aspecific "Cl" fire rating, such as "Cl -2" or "Cl -3". Consult your
Russound dealer, building contractor, or local building and inspection department if
unsure about which type of wire is best for your application. If you need speaker wire,
we recommend you order Russound AW series wire. The AW Series speaker cables
use multi-strand copper wire and high-temperature PVC jackets specially designed for
snaking through the walls and for long speaker runs.
OPTIONAL RUSSOUND COMPONENTS
The wiring diagram for the TBl -75 includes an ALT x and optional EZB-1 SC. The EZB-
1 SC is recommended but not required for TBl -75 installation. The EZB-SC connecting
block is a neat, compact wiring device capable of connecting four volume controls to an
amplifierls outputs. The AlTx volume control is an in-wall stereo volume control.
WIRING INSTRUCTIONS
1. Connect the speaker leads from the amplifier's outputs to the connector labeled
Input on the TBl -75. The wires should stay consistent, left +of the amplifier to left +
Input of
the TBl -75, observing polarity and identification.
CAUTION: Do not reverse the input and output connections on the TBl -75!!
2. Connect speaker wire from the TBl -75 Output connector to the speakers.
WIRING INSTRUCTIONS USING OPTIONAL EZB1-SC
1. Connect the speaker leads from the amplifier's outputs to the connector labeled
Input on the EZB-1 SC. The wires should stay consistent, left +of the amplifier to
left +Input of the EZB-1 SC, observing polarity and identification.
2. Connect speaker wire from the EZB-1 SC Output connector to the Input connector
on the TBl-75.
3. Connect speaker wire from the TBl -75 Output connectors to the speakers.
4
TYPE OF SPEAKER WIRE
For most applications, we recommend you use 16 or 18 gauge, stranded copper
speaker
wire for the TBl -75 speaker connections. For wiring runs longer than 100 feet,
14 gauge wire is recommended. Using speaker wire larger than 14 gauge for TBl -75
Volume Controls is not recommended as the wire may not fit into the connectors.
NOTE - Never use solid-core, aluminum or Romex® type wire with volume controls.
When running speaker wires inside walls, most states and municipalities in the U.S.
specify that you must use a special type of speaker wire. Usually, the requirement is
that the wire has aspecific "Cl" fire rating, such as "Cl -2" or "Cl -3". Consult your
Russound dealer, building contractor, or local building and inspection department if
unsure about which type of wire is best for your application. If you need speaker wire,
we recommend you order Russound AW series wire. The AW Series speaker cables
use multi-strand copper wire and high-temperature PVC jackets specially designed for
snaking through the walls and for long speaker runs.
OPTIONAL RUSSOUND COMPONENTS
The wiring diagram for the TBl -75 includes an ALT x and optional EZB-1 SC. The EZB-
1 SC is recommended but not required for TBl -75 installation. The EZB-SC connecting
block is a neat, compact wiring device capable of connecting four volume controls to an
amplifierls outputs. The AlTx volume control is an in-wall stereo volume control.
WIRING INSTRUCTIONS
1. Connect the speaker leads from the amplifier's outputs to the connector labeled
Input on the TBl -75. The wires should stay consistent, left +of the amplifier to left +
Input of
the TBl -75, observing polarity and identification.
CAUTION: Do not reverse the input and output connections on the TBl -75!!
2. Connect speaker wire from the TBl -75 Output connector to the speakers.
WIRING INSTRUCTIONS USING OPTIONAL EZB1-SC
1. Connect the speaker leads from the amplifier's outputs to the connector labeled
Input on the EZB-1 SC. The wires should stay consistent, left +of the amplifier to
left +Input of the EZB-1 SC, observing polarity and identification.
2. Connect speaker wire from the EZB-1 SC Output connector to the Input connector
on the TBl-75.
3. Connect speaker wire from the TBl -75 Output connectors to the speakers.

Speaker wire
Speakers
o
o
ALT x volume control
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Typical TBL-75 Configuration (optional connections for EZB-1SC)
5
Speaker wire
Speakers
o
o
ALT x volume control
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Speakers
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.... r-"Oe--'r ;.6)-. -'::--., e-:=-\
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Typical TBL-75 Configuration (optional connections for EZB-1SC)
5