Biamp IWA SERIES Instruções de Operação descarregar pdf (Página 9)

INSTALLATION

Loudspeaker Wiring: Model IWA 250 provides a single 250 Watt amplifier (Main). To help offset the inductance of certain speaker

matching transformers, the IWA 250 includes a high-pass filter (see pg. 3), which must be enabled whenever the 70V or 25V outputs are

being used. Loudspeaker wiring is connected to the screw-terminal block on the amplifier/power supply circuit board, located inside the

chassis front panel, at the upper left-hand corner. This screw-terminal block accept wires of #12 AWG (or smaller) gauge, or 1/4" spade-

lug wire connectors.

These screw terminals provide the speaker outputs from the amplifier. From the factory, a jumper strap is installed betweem the 4 OHM

terminal (amplifier direct output) and the XFMR INPUT (transformer input) terminal. For transformer (xfmr) output, connect speaker

negative to the COM terminal, and connect speaker positive to the appropriate transformer output terminal (8 OHM for an 8 ohm speaker

load; 70V for a 70 Volt distributed speaker system; 25V for a 25 Volt distributed speaker system). For 'balanced' 25V speaker systems,

connections are the same as above, plus a ground connection (center-tap) made to the 25V C.T. terminal. For direct output from the

amplifier, first remove the factory installed jumper strap, then connect speaker negative to the GND terminal, and connect speaker positive

to the 4 OHM terminal.

OHM

70V

25V

C.T.

COM

XFMR

INPUT

GND

OHM

Wire Routing: Wiring that carries signals of dramatically different voltages must be separated by as much distance as possible.

Microphone and line level wiring should never be run with loudspeaker or power wiring. To reduce the potential of crosstalk or oscillations

that could damage the amplifier, never bundle the microphone and line level cables with loudspeaker or power cables. It is recommended

that all loudspeaker wiring enter the backbox at the upper right "knock-out", and route through the cable tray. Loudspeaker wire should be

of a heavy gauge, to prevent cable losses from degrading the system capabilities. Cable runs using 14 gauge wire should not exceed 90

feet (for 8 ohm operation) or 45 feet (for 4 ohm operation). Longer cable lengths require heavier gauge cable (smaller wire number).

Constant voltage outputs (25, 70.7, or 100 volts) can tolerate lighter gauge cables or longer cable runs (check an appropriate line loss

chart for specific application requirements).

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Biamp IWA SERIES Instruções de Operação Página 9