Everything in Music - Since 1958

QSC ISA300Ti 2-Channel Power Amplifier

  • Our Price
  • Regular price $1,025.00

• Inventory changes daily
Contact us for availability | tel: 301-946-8808
• Please allow for additional delivery time due to COVID 19

The QSC ISA300Ti Amplifier is an Ideal, Cost-Effective Solution for Fixed Installation Applications Requiring Low Impedance or Distributed Loudspeakers

The "Ti" versions (ISA 300Ti, ISA 500Ti, ISA 800Ti) featuring isolated transformers for 25, 70 and 100 volt distributed audio systems. The DataPort V2 Lite connection facilitates the use of amplifier accessories (XC-3, LF-3 and SF-3.) providing economical crossover and subwoofer filtering solutions.

  • Low-impedance outputs plus isolated 25, 70, and 100 volt outputs for distributed audio systems
  • Rear panel gain controls for tamper resistance; 2-dB detents allow for quick and repeatable settings
  • XLR and detachable Euro-style input connectors
  • DataPort V2 for use with DPV2-compatible signal processing accessories (XC-3, SF-3, LF-3) and DSP-3/DSP-4 (with external power supply)
  • Independent defeatable clip limiters for reduced distortion
  • Selectable high-pass filters (50 Hz or 75 Hz) protect speakers and prevent speaker transformer saturation, with minimal effect on program material
  • Front panel indicators include power, signal, and clip
  • Covered barrier strip output connectors for safety agency compliance
  • Automatic on-demand variable-speed fan: quiet normal operation, with maximum cooling when needed
  • Rear-to-front air flow helps keep equipment racks cool
  • Stereo, bridge, or parallel operating modes
  • Comprehensive protection circuitry including DC, infrasonic, thermal overload, and short circuit protection
  • 3-year warranty plus optional 3-year extended service contract



  • Signal to Noise (20 Hz-20 kHz): 100 dB
  • Input Sensitivity at 8 Ω: 1.15 V (+3.4 dBu)
  • Maximum Voltage Gain: 33.4× (30.5 dB)
  • Output Circuitry: Class AB
  • Distortion
    • 20 Hz - 20 kHz, 10 dB below rated power: Less than 0.03% THD, 4 ohms and 8 ohms
    • 1.0 kHz and below, full rated power: Less than 0.03% THD, 4 ohms and 8 ohms
    • SMPTE-IM: Less than 0.01%
  • Frequency Response (10 dB below rated output power)
    • Direct outputs: -3 dB @ 50 Hz, -0.5 dB @ 20 kHz
    • XF outputs: 50 Hz - 16 kHz, +1/-3 dB
  • Damping Factor with 8Ω Load (direct outputs): Greater than 200; ISA 1350 greater than 250
  • Output Regulation (isolated outputs): Less than 1.5 dB
  • Input Impedance: 10 kΩ unbalanced, 20 kΩ balanced
  • Input Clipping: 10 Vrms (+22 dBu)
  • Cooling: Continuously variable speed fan, back-to-front air flow
  • Protection
    • Amplifier: Full short circuit, open circuit, thermal, ultrasonic, and RF protection; Stable into reactive or mismatched loads
    • Load: On/off muting, AC coupling
  • Connectors (each channel)
    • Input: Active balanced; 3-pin Euro-style detachable terminal block and XLR (pin 2+)
    • Output: Covered barrier strips
    • DataPort V2: HD-15 connector
  • Controls
    • Front: AC switch
    • Rear: Ch. 1 and Ch. 2 gain knobs, 10-position DIP switch
  • Indicators
    • PWR-ON: Green LED
    • SIGNAL: Green LED (1 per channel)
    • CLIP: Red LED (1 per channel)
  • Dimensions (H x W x D): 5.25 x 19 x 15.9 inch / 133 x 483 x 400 mm
  • Weight: 44 lb / 20.0 kg
  • Power Requirements: 120 or 230 VAC, 50–60 Hz


  • Per Channel, Stereo Mode, Both Channels Driven
    • 8Ω, 20 Hz-20 kHz 0.1% THD: 185 W
    • 4Ω, 20 Hz-20 kHz 0.1% THD: 280 W
    • 2Ω 1 kHz 1% THD: 430 W
  • Per Channel, Stereo Mode, Transformer Isolated
    • 70V or 100V, 50 Hz-16 kHz 0.5% THD: 300 W
    • 25V, 50 Hz-16 kHz 0.5% THD: 200 W
  • Bridged Mono Mode
    • 8Ω, 1 kHz 0.1% THD: 600 W
    • 4Ω 1 kHz 1% THD: 830 W
  • Bridged Mono Mode, Transformer Isolated
    • 140V or 200V, 50 Hz-16 kHz 0.5% THD: 600 W

Manufacturer: QSC Audio
Model: ISA300TI
SKU: I240654-N-0-WHXD
UPC: 684284044990

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