QSC Audio ISA 500T - Manual (Page 21)

CONNECTIONS:
OUTPUTS- DIRECT LOW IMPEDANCE (LO-Z)
BRIDGE MODE PRECAUTIONS:
Do Not Use 2 ohm Loads in Bridge Mono Mode! 4 ohms is the minimum impedance for bridge mono operation!
This mode puts a high demand on the amplifier and speaker. Excessive clipping may cause protective muting or
speaker damage. Ensure the speaker has a sufficient power rating.
Output voltages greater than 100 volts rms are available between the amplifier's bridged terminals. CLASS 2 or
CLASS 1 wiring methods, as specified in accordance with national (NEC) and local codes, must be used to connect
the speaker. To prevent electric shock, do not operate the amplifier with any conductors of the speaker cable
exposed. Consult the local & national electrical codes for full information.
ISA amplifiers are equipped with screw-terminal output connections. The ISA 280, ISA 450 and ISA 750 provide low-impedance
outputs only (2 to 16 ohms) while the ISA 300T, ISA 500T and ISA 800T provide both low-impedance and high-impedance (25V, 70V and
100V) outputs.
When selecting speaker cable (wire), always use the largest wire size and shortest length of wire practical for any given installation.
Larger wire sizes and shorter lengths minimize power loss and degradation of damping factor.
Do not place speaker cables next to
input wiring.
Direct Low Impedance Output Connections- Use these terminals for 2 through 16 ohm loads.
STEREO or PARALLEL Mode: Connect each
speaker cable to its respective channel’s screw
terminals. Make sure speaker polarity is maintained.
Note that channel 1 and channel 2 connections have
the positive (+) terminal in different locations.
BRIDGE Mode: Connect the one speaker cable to
the center screw terminals labeled BRIDGE MONO.
Make sure speaker polarity is maintained. 2 ohm
loads are not usable in BRIDGE mode.
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