User Manual

7
Input Wiring Connections
Night Ringer Connection Either a standard telephone (analog) ring signal (90 – 105V AC, 20 – 30 Hz) or
an external contact closure activates the night ringer function of the amplifier. To
activate the night ringer using standard telephone (analog) ring, connect the
analog station's tip lead to the TEL RING "T" terminal and connect the ring lead
to the "R" terminal. If using an external contact closure, connect the closure pair
across the CONTACT RING and GND terminals. The night ringer follows the
cadence of the activating signal.
Bridging Inputs Two RCA jacks in parallel are provided to ease interconnection of multiple amps.
Bridging permits two amplifiers to be used in tandem with one another to increase
the total output power of the system, thereby permitting additional speakers to be
added (see Fig. 5). For example, when two 250-watt amplifiers are bridged, the
total output capacity of the system is 500 watts. However, bridging does not
increase the size of the load a TPU250 can individually handle. Once bridged,
each amplifier will amplify the inputs present on both amplifiers. The level control
of a particular input on an amplifier will control the volume of this signal on both
amplifiers. The cable used to bridge amplifiers should not exceed 20 feet in
length.
NOTE: You cannot bridge more than two TPU amplifiers. A TPU250 amplifier can
only be bridged with another TPU250 amplifier.
Input Cover Replacement When all connections are made, remove an appropriate knockout on the input
cover. Replace the cover and tighten the screws while dressing the wires through
the knockout hole.
Figure 5: Bridging Inputs
ON
OFF
ON
OFF
ON
OFF
ON
OFF