QSC ISA 500Ti 70V Dual Channel AmplifierDesigned as a cost-effective solution specifically for sound contractors, the "Ti" versions with isolated 25, 70 and 100 volt outputs for distributed audio systems. Versatile loading options and a comprehensive feature set make the ISA Series a rugged, cost-effective power solution for any permanently installed sound system.
Unique among distributed sound power amplifiers, the "Ti" versions will drive 8 or 4 ohm loads and a distributed system on the same channel simultaneously. This enables a contractor to reduce the number of required amplifier channels by allowing a limited number of distributed speakers to be attached to the same amp as is powering the main sound system.
Housed in a rugged 3-U chassis, this model features rear panel gain controls for tamper resistant operation with 2 dB detents for quick and repeatable settings. Inputs include both XLR and detachable Euro-style connectors. Outputs feature covered barrier strip connectors for safety agency compliance, and for added versatility, a DataPort V2 (Version 2) terminated with an HD-15 connector is provided for use with DPV2-compatible signal processing accessories such as the XC-3 Crossover, SF-3 Subwoofer Filter, LF-3 Low Frequency Filter and the DSP-3 with external power supply.
Selectable high-pass filters are included to protect speakers and prevent speaker transformer saturation with minimal effect on program material. The ISA Series provide additional protection circuitry including DC, infrasonic, thermal overload, RF and short circuit protection.
Specifications: • Power output, stereo mode (EIA 1 kHz, both channels driven): 260 watts x 2 (8 ohms); 420 watts x 2 (4 ohms); 700 watts x 2 (2 ohms) • Power output, XF output power, stereo mode: 500 watts x 2 (70V), 300 watts x 2 (25V) • Power output, bridged mono mode (EIA 1 kHz): 900 watts x 1 (8 ohms), 1,400 watts x 1 (4 ohms) • Distortion (typical): <0.01% • S/N ratio (20 Hz - 20 kHz, 8 ohms): 100 dB • Frequency response: Direct output, -3 dB @ 50 Hz. and -0.5 dB @ 20 kHz; XF output, 50 Hz - 16 kHz, +1 and -3 dB • Input sensitivity @ 8 ohms: 1.07V • Voltage gain @ 8 ohms: 44.7x (33 dB) • Output circuitry: Class AB • Dimensions: 5.25" (3RU) H x 19" W x 15.9" D • Weight: 49 lbs.
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Constant Voltage (70-Volt) Audio Systems
Audio distribution systems, especially those commonly used in department stores, warehouses, restaurants, etc., require that many loudspeakers be driven from a single audio amplifier over long runs of speaker wire. The "constant voltage" or "high impedance distribution" audio systems can be complex to understand at first, however, provides many advantages. Learn how to design your own 70-volt or 25-volt loudspeaker system.
