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TRC400
TRC400 Page 1 of 2
© 1999, Community Light & Sound, Inc.
D
ESCRIPTION
The TRC400 is a 400 Watt line transformer used to step down
the voltage and impedance of "constant voltage" audio
distribution lines to the voltage level and impedance required
by loudspeakers. It can also be used to step up the voltage of
an amplifier to the voltage needed for a distribution line. The
TRC400 has three output taps. The taps allow individual
loudspeakers to be adjusted to operate at the same or different
power levels compared to other loudspeakers in a system on
the distribution line. The input taps on the TRC400 allow it
to be used with 70V, 100V, and 140V distribution systems.
The output taps of the TRC400 are designed to drive either 8
ohm or 4 ohm loudspeakers. See the Usage Tables for the
various capabilities.
The TRC400 is manufactured from high quality materials Its
high permeability iron core provides high power handling at
low frequencies. The TRC400 has four mounting tabs that
allow it to be bolted into back-boxes or other enclosures, to
loudspeaker enclosures, or to loudspeaker mounting
hardware. The stripped wire input and output leads can be
easily connected to loudspeaker terminals and the
distribution cable in a variety of ways including terminal
strips, soldering, and wire-nuts.
4.5 in.
114 mm
S
PECIFICATIONS (See notes 1 - 3)
F
EATURES
:
A
PPLICATIONS
:
Can Be Used for Voltage Step-down or Step-up
Low Insertion Loss
Excellent Low Frequency Performance at Full Power
TRC400
400 WATT 70V / 100V / 140V LINE TRANSFORMER
140V, 100V, and 70V Lousdpeaker Distrtibution Systems
Excellent Match for R1 and R2 Loudspeaker Systems
Use for High Power M4 Distributed Announcement Systems
Type:
Line transformer for constant voltage audio distribution lines
Inputs: (3) 70V, 100V, or 140V line
Maximum Inputs:
70V RMS / 100V peak
100V RMS / 140V peak
140V RMS / 195V peak
Output Taps:
(3): full power, 1/2 power, 1/4 power
Output Load:
Nominal 4 or 8 Ohm
Frequency Response:
50 Hz - 16 kHz (+/- 1 dB)
Insertion loss:
1.1 dB
Turns Ratio:
140V to 400W tap 7:2
200W tap 5:1
100W tap 7:1
100V to 400W tap 5:2
200W tap 7:2
100W tap 5:1
70V to 400W tap 7:4
200W tap 5:2
100W tap 7:2
Input & Output Connections:
7 in / 178 mm #18 AWG color coded wires
with stripped ends
Construction:
Open frame
Mounting Provisions:
(4) mounting tabs each with a
0.44 in. / 11 mm x 0.22 in. / 6 mm hole
Dimensions:
Height: 3.75 in. / 95 mm
Width: 4.5 in. / 114 mm
Depth: 3.75 in. / 95 mm
Weight:
8.9 lb. / 4.1 kg
Shipping Weight: 9.5 lb. / 4.3 kg TRC400 Page 2 of 2
TR400-991020
The transformer shall be an audio line transformer for step down or step up use with high voltage, audio distribution lines.
For step down use, it shall have three input taps for 140 volts, 100 volts, and 70 volts RMS inputs and three output taps for
400W, 200W, and 100W RMS for use with nominal 4 to 8 Ohm loads. The output taps shall provide 1/2 their rated power
for 8 Ohm loads. The inputs and outputs may reversed for step up use. The insertion loss for any combination of input to
output shall be a maximum of 1.1 dB. Frequency response shall be from 50 Hz to 16 kHz (+/- 1 dB) at 400 watts. All taps
shall have 7 in (178 mm) long, 18 gauge wires for connections. It shall be constructed with a high permeability iron core and
copper windings. Construction shall be of the open frame type with four 0.875 in. (22 mm) x 0.75 in. (19 mm) mounting
tabs. The transformer shall be be 3.75 in. (95 mm) H x 4.5 in. (114 mm) W x 3.75 in. (95 mm) D and weigh 8.9 lb (4.1 kg).
A
RCHITECTS
' A
ND
E
NGINEERS
' S
PECIFICATIONS
D
IMENSIONS
Specifications subject to change without notice.
10
100
1,000
10,000
TRC400
400 WATT 70V / 100V / 140V LINE TRANSFORMER
Frequency in Hertz
1 dB per Div
.
NOTE: The Frequency Response is a plot of the relative difference
in acoustic output of a loudspeaker with and without the
transformer. Measurement was made at rated output (400W).
USAGE TABLES:
F
OR
140V, 100V & 70 V I
NPUT
T
APS
:
Input Z for
4 Ohm
Input Z for
8 Ohm
Output Tap
4 Ohm Load
Power Output
8 Ohm Load
Power Output
RMS Output
400W
100 Ohms
310W
50 Ohms
155W
35 V
200W
200 Ohms
155W
100 Ohms
77W
25 V
100W
400 Ohms
77W
200 Ohms
40W
17.5 V
S
TEP
-
UP
U
SE FOR
140V O
UTPUT
S
TEP
-
UP
U
SE FOR
100V O
UTPUT
S
TEP
-
UP
U
SE FOR
70V O
UTPUT
Input Tap
Maximum
Amp Load At
Input Tap
Maximum
Amp Load At
Input Tap
Maximum
Amp Load At
Used
Output Load
Max Output Load
Used
Output Load
Max Output Load
Used
Output Load
Max Output Load
400W
50 Ohms
4 Ohms
400W
25 Ohms
4 Ohms
400W
12 Ohms
4 Ohms
200W
100 Ohms
4 Ohms
200W
50 Ohms
4 Ohms
200W
25 Ohms
4 Ohms
100W
200 Ohms
4 Ohms
100W
100 Ohms
4 Ohms
100W
50 Ohms
4 Ohms
Notes: 1. Label on transforemer will only list performance for 140V, 100V, and 70V inputs and a nominal 4 ohm load.
2. The 1.1 dB insertion loss is INCLUDED in above table for Power and RMS output values.