QSC ISA300Ti 300W 2-Channel Power Amplifier

The QSC ISA300Ti is a high-performance power amplifier engineered to meet the demanding requirements of sound contractors and audio professionals. Delivering 300 watts per channel into 70V or 100V distributed audio systems, this amplifier ensures consistent and reliable power for various installed sound applications. Its rugged construction and robust design make it an ideal choice for venues such as houses of worship, conference centers, and auditoriums.

Designed with flexibility in mind, the ISA300Ti supports both low-impedance and transformer-isolated outputs, allowing it to drive 8Ω and 4Ω loads, as well as distributed systems on the same channel simultaneously. This versatility simplifies system configuration and reduces the need for additional equipment, making installations more efficient and cost-effective.

The amplifier features rear panel gain controls with 2 dB detents for precise and repeatable settings, ensuring optimal performance tailored to your specific needs. Input connectivity is enhanced with both XLR and detachable Euro-style connectors, providing compatibility with a wide range of audio sources. Additionally, the ISA300Ti includes comprehensive protection circuitry, safeguarding against short circuits, open circuits, thermal overload, and RF interference, thereby ensuring long-term reliability and peace of mind.

Key Features

• 300W per channel into 70V or 100V distributed audio systems.
• Supports low-impedance (8Ω and 4Ω) and transformer-isolated outputs simultaneously.
• Rear panel gain controls with 2 dB detents for accurate adjustments.
• XLR and detachable Euro-style input connectors for versatile connectivity.
• Comprehensive protection circuitry ensures amplifier and load safety.
• Rugged construction suitable for various installed sound environments.

Technical Specifications

Output Power 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

Transformer-Isolated Output Power per Channel, Stereo Mode

• 70V or 100V, 50 Hz–16 kHz, 0.5% THD: 300 W
• 25V, 50 Hz–16 kHz, 0.5% THD: 200 W

Output Power, Bridged Mono Mode

• 8Ω, 1 kHz, 0.1% THD: 600 W
• 4Ω, 1 kHz, 1% THD: 830 W

Transformer-Isolated Output Power, Bridged Mono Mode

• 140V or 200V, 50 Hz–16 kHz, 0.5% THD: 600 W

Signal to Noise (20 Hz–20 kHz): 100 dB

Distortion (SMPTE-IM): Less than 0.01%

Input Sensitivity @ 8Ω: 1.15 V (+3.4 dBu)

Maximum Voltage Gain: 33.4× (30.5 dB)

Output Circuitry: Class AB

Weight - Net: 44 lb (20.0 kg)

Weight - Shipping: 50 lb (22.7 kg)

Distortion (Typical): Less than 0.03% THD, 4Ω and 8Ω

Frequency Response: 20 Hz–20 kHz, +0/-0.3 dB

Output Regulation (isolated outputs): Less than 1.5 dB

Input Impedance: 10 kΩ unbalanced, 20 kΩ balanced

Input Clipping: 10 V rms (+22 dBu)

Cooling: Continuously variable speed fan, back-to-front air flow

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" (3RU)

Amplifier Protection: Full short circuit, open circuit, thermal, ultrasonic, and RF protection; Stable into reactive or mismatched loads

Power Requirements: 120 or 230 VAC, 50–60 Hz

Load Protection: On/off muting; Triac crowbar: ISA 750, 1350, and 800Ti; AC coupling: ISA 280, 300Ti, 450, and 500Ti

What's Included

• QSC ISA300Ti Power Amplifier
• Power Cable
• User Documentation