Designed as a cost-effective solution specifically for sound contractors the ISA Series features seven models including four low impedance models (ISA 280 ISA 450 ISA 750 ISA 1350) rated for 2-ohm operation and three "Ti" versions with isolated 25 70 and 100 volt outputs for distributed audio systems (ISA 300Ti ISA 500Ti ISA 800Ti). 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 Live Sound > Amplifiers > 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 all seven models feature 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.
On the ISA 750 and ISA 800Ti class H complementary bipolar output circuitry increases system efficiency by reducing AC power draw and waste heat by 40%. Cooling is accomplished via an automatic variable speed fan which pulls air from back to front.
FEATURES
- Four models for low-impedance applications
- ISA 1350 drives 70V lines directly with 1500 watts / channel
- Three "Ti" versions include low-impedance and isolated 25 70 and 100 volt outputs for distributed audio systems
- Rear panel gain controls for tamper resistant operation with 2 dB detents 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 protect speakers and prevent speaker transformer saturation with minimal effect on program material (30 Hz or 70 Hz on non-"Ti" models 50 Hz or 75 Hz on "Ti" models)
- Class H complementary bipolar output circuitry reduces AC power draw and waste heat by 40% on ISA 750 and 800Ti and by 50% on ISA 1350
- Front panel indicators include power signal and clip (and protect on ISA 1350)
- Covered barrier strip output connectors for safety agency compliance
- Automatic variable-speed fan for quiet normal operation with maximum cooling on demand
- Rear-to-front air flow keeps 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
- "Ti" Models
- 25 70 100 volt and low-impedance outputs available simultaneously
- Simple barrier strip connection determines output mode
- "Ti" models have fully isolated 25 70 and 100 volt outputs
Specifications
| 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 | 100 dB | 100 dB | 100 dB | 100 dB | 100 dB | 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 |
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| 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 |
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| 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 |
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| Controls | Front: AC switch Rear: Ch. 1 and Ch. 2 gain knobs, 10-position DIP switch |
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| Indicators | PWR-ON: Green LED; SIGNAL: Green LED (1 per channel); CLIP: Red LED (1 per channel) |
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| Dimensions | 19" (48.3 cm) rack mounting, 5.25"(13.3 cm) tall (3 rack spaces), 15.9" (40 cm) deep (from front mounting rails) |
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| Amplifier Protection | Full short circuit, open circuit, thermal, ultrasonic, and RF protection; Stable into reactive or mismatched loads |
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| 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 | ||||||
