TP-170V
The Crown®TP-170V is a rack-mountable
panel with autoformers to provide imped-
ance matching between amplifier outputs
and “constant voltage” loudspeakers. This unit
allows amplifiers without direct 70V or 100V
output capability to drive distributed speaker
systems designed to operate at those voltages.
The TP-170V is constructed of sturdy steel, and
hinged on one side to allow easy access to the
inside connections.
For more details about the Crown TP-170V,
contact Crown Customer Service at
800-342-6939 or 574-294-8200. Also, visit the
Crown Audio website at www.crownaudio.com.
Specifications
Output connectors: One five-pole terminal strip
per channel with touch-proof cover. Accepts up
to 10 AWG terminal forks.
Frequency Response: +/- 0.5 dB (20 Hz to 20
kHz).
Insertion (Core) Loss: 0.41 dB max (70VAC at
50 Hz).
Dimensions:
19 in (48.3 cm) wide (including hinge)
7.23 in (18.4 cm) high
1.45 in (3.7 cm) deep.
Weight: 12.75 lbs (5.78 kg).
Installing the TP-170V
CAUTION: Before you begin, make sure your
amplifier is disconnected from the power
source, with the power switch in the “off”
position and all level controls turned com-
pletely down (counterclockwise).
Use a standard 19-inch (48.3-cm) equipment
rack (EIA RS-310B) to install the TP-170V.
Connect the Grounding Strap
Connect the TP-170V grounding strap to a rack
rail or rack ground, and be sure the rack is
grounded to an AC mains safety ground. (Test
the AC mains ground to make sure it is reli-
able). If you are not using a rack, be sure to
connect the TP-170V grounding strap to an AC
mains safety ground and mount the unit in a
metal box for safety. Insulate the TP-170V from
the box.
CAUTION: Do not remove the grounding strap
or leave it unconnected.
Choose Output Wire and Connectors
Crown recommends using professionally con-
structed, high quality, two- or four-conductor,
heavy gauge speaker wire and connectors. You
may use terminal forks or bare wire for your
output connectors. The TP-170V terminal strips
accept up to 10 AWG terminal forks which fit
over a #8 screw.
CAUTION: Use insulated terminal forks to pre-
vent shorting against the touch-proof cover
plate.
To connect TP-170V outputs, first remove the
touch-proof cover plate covering the output
terminal strip by removing the three screws
which hold it in place. To prevent the possibility
of short-circuits, wrap or otherwise insulate
exposed loudspeaker cable and connectors.
Reinstall the cover plate.
Wire Your System
Refer to the chart in Figure 1 to determine the
proper transformer tap to use, based on the
rated output power of your amplifier and the
desired constant-voltage of your system. Then
wire the connections as shown in the corre-
sponding wiring diagram in Figs. 2 through 4.
CAUTION: Never use shielded cable for output
wiring.
CONSTANT-VOLTAGE TRANSFORMER PANEL
Features
• Four autoformers per panel provide four channels of impedance matching for Constant-Voltage opera-
tion
• Provides 100V output in Dual mode when used with CTs 600, CTs 1200, CTs 4200 and CTs 8200 ampli-
fiers
• Allows amplifiers without direct Constant-Voltage capability to be easily integrated into distributed
systems
• Convenient hinged rack mounting allows easy access to connections
