Features
- 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
| SPECIFICATIONS | ISA280 | ISA450 | ISA750 | ISA1350 | ISA300Ti | ISA500Ti | ISA800Ti |
| OUTPUT POWER PER CHANNEL, STEREO MODE, both channels driven | |||||||
| 8Ω, 20 Hz–20 kHz 0.1% THD 4Ω, 20 Hz–20 kHz 0.1% THD 2Ω 1 kHz 1% THD | 185 W 280 W 430 W | 260 W 425 W 700 W | 450 W 650 W 1200 W | 800 W 1300 W 2000 W | 185 W 280 W 430 W | 260 W 425 W 700 W | 450 W 650 W 1200 W |
| DIRECT POWER PER CHANNEL, STEREO MODE | |||||||
| 70V, 20 Hz–20 kHz +0/-0.3 dB 0.5% THD | - | - | - | 1500 W | - | - | - |
| TRANSFORMER-ISOLATED OUTPUT POWER PER CHANNEL, STEREO MODE | |||||||
| 70V or 100V, 50 Hz–16 kHz 0.5% THD 25V, 50 Hz–16 kHz 0.5% THD | - - | - - | - - | - - | 300 W 200 W | 500 W 300 W | 800 W 500 W |
| OUTPUT POWER, BRIDGED MONO MODE | |||||||
| 8Ω, 1 kHz 0.1% THD 4Ω 1 kHz 1% THD | 600 W 830 W | 900 W 1400 W | 1500 W 2400 W | 2800 W 4000 W | 600 W 830 W | 900 W 1400 W | 1500 W 2400 W |
| TRANSFORMER-ISOLATED OUTPUT POWER, BRIDGED MONO MODE | |||||||
| 140V or 200V, 50 Hz-16 kHz 0.5% THD | - | - | - | - | 600 W | 1000 W | 1600 W |
| Signal to Noise (20 Hz-20 kHz) | 100 dB | ||||||
| Distortion (SMPTE-IM) | Less than 0.01% | Less than 0.01% | Less than 0.02% | Less than 0.01% | Less than 0.01% | Less than 0.01% | Less than 0.02% |
| Input Sensitivity @ 8 ohms | 1.15 V (+3.4 dBu) | 1.07 V (+2.8 dBu) | 1.07 V (+2.8 dBu) | 1.24 V (+4.1 dBu) | 1.15 V (+3.4 dBu) | 1.07 V (+2.8 dBu) | 1.07 V (+2.8 dBu) |
| Maximum Voltage Gain | 33.4× (30.5 dB) | 44.7× (33 dB) | 56.2× (35 dB) | 64.0× (36.1 dB) | 33.4× (30.5 dB) | 44.7× (33 dB) | 56.2× (35 dB) |
| Output Circuitry | Class AB | Class AB | Class H, 2 tier | Class H, 3 tier | Class AB | Class AB | Class H, 2 tier |
| THX Approved | - | Yes | Yes | - | - | - | - |
| Weight - Net | 36 lb (16.3 kg) | 42 lb (19 kg) | 47 lb (21.3 kg) | 68 lb (30.8 kg) | 44 lb (20.0 kg) | 49 lb (22.3 kg) | 57 lb (26 kg) |
| Weight - Shipping | 42 lb (19.1 kg) | 48 lb (22 kg) | 53 lb (24.0 kg) | 77 lb (34.4 kg) | 50 lb (22.7 kg) | 55 lb (25 kg) | 63 lb (28.6 kg) |
| ALL MODELS | |||||||
| Distortion (Typical) 20 Hz–20 kHz: 10 dB below rated power 1.0 kHz and below: full rated power | Less than 0.03% THD, 4 ohms and 8 ohms Less than 0.03% THD, 4 ohms and 8 ohms | ||||||
| Frequency Response 10 dB below rated output power | ISA 280, 450, 750 and 1350: 20 Hz–20 kHz, +0/-1 dB; -3 dB points: 5 Hz and 50 kHz | ISA 300Ti, 500Ti and 800Ti: 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 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 (HWD) inches | 5.25 x 19 x 15.9 / 3RU | ||||||
| Dimensions (HWD) mm | 133 x 483 x 400 / 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 |
