The ISA Installed System Amplifiers are designed to meet the needs of sound system designers and contractors worldwide. Three models feature isolated 25, 70, and 100-volt outputs for distributed sound systems, while four low impedance models are rated for 2 ohm operation.
QSC ISA450 Features
- 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 (30 Hz or 70 Hz) protect speakers and prevent speaker transformer saturation with minimal effect on program material
- Front panel LED 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
- ISA450 2-Channel 260W Power Amplifier1
- Three Year Warranty plus optional 3-year extended service contract1
- OUTPUT POWER PER CHANNEL, STEREO MODE, both channels driven
- 8Ω, 20 Hz–20 kHz 0.1% THD: 260W
- 4Ω, 20 Hz–20 kHz 0.1% THD: 425W
- 2Ω 1 kHz 1% THD: 700W
- OUTPUT POWER, BRIDGED MONO MODE
- 8Ω, 1 kHz 0.1% THD: 900W
- 4Ω 1 kHz 1% THD: 1400W
- Signal to Noise (20 Hz-20 kHz)100dB
- Distortion (SMPTE-IM)Less than 0.01%
- Input Sensitivity @ 8 ohms1.07 V (+2.8 dBu)
- Maximum Voltage Gain44.7× (33 dB)
- Output CircuitryClass AB
- THX ApprovedYes
- Weight - Net36 lb (16.3 kg)
- Weight - Shipping42 lb (19.1 kg)
- Distortion (Typical) 20 Hz–20 kHz: 10 dB below rated powerLess than 0.03% THD, 4 ohms and 8 ohms
- 1.0 kHz and below: full rated powerLess than 0.03% THD, 4 ohms and 8 ohms
- Frequency Response 10 dB below rated output powerISA 280, 450, 750 and 1350: 20 Hz–20 kHz, +0/-1 dB; -3 dB points: 5 Hz and 50 kHz
- 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 Impedance10 kΩ unbalanced, 20 kΩ balanced
- Input Clipping10 V rms (+22 dBu)
- CoolingContinuously 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 (HWD) inches5.25 x 19 x 15.9 / 3RU
- Dimensions (HWD) mm133 x 483 x 400 / 3RU
- Amplifier Protection
- Full short circuit, open circuit, thermal, ultrasonic, and RF protection;
- Stable into reactive or mismatched loads
- Power Requirements120 or 230 VAC, 50–60 Hz
- Load ProtectionOn/off muting; Triac crowbar: ISA 750, 1350, and 800Ti; AC coupling: ISA 280, 300Ti, 450, and 500Ti