QSC ISA1350 Sound Contractor Power Amplifier New


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QSC

ISA1350

Sound Contractor Power Amplifier

New

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 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 ISA280 ISA450 ISA750 ISA1350 ISA300Ti ISA500Ti ISA800Ti
  STEREO MODE, Both Channels Driven
8 ohms 20 Hz-20 kHz 0.1% THD 185W 260W 450W 800W 185W 260W 450W
4 ohms 20 Hz-20 kHz 0.1% THD 280W 425W 650W 1300W 280W 425W 650W
2 ohms 1 kHz 1% THD 430W 700W 1200W 2000W 430W 700W 1200W
  DIRECT POWER, STEREO MODE
70V 20 Hz-20 kHz +0/-0.3 dB 0.5% THD - - - 1500W - - -
  XF OUTPUT POWER, STEREO MODE
70V or 100V 50 Hz-16 kHz 0.5% THD - - - - 300W 500W 800W
25V 50 Hz-16 kHz 0.5% THD - - - - 200W 300W 500W
  BRIDGED MONO MODE
8 ohms 1 kHz 0.1% THD 600W 900W 1500W 2800W 600W 900W 1500W
4 ohms 1 kHz 1% THD 830W 1400W 2400W 4000W 830W 1400W 2400W
  XF OUTPUT POWER, BRIDGED MONO MODE
140V or 200V 50 Hz-16 kHz 0.5% THD - - - - 600W 1000W 1600W
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 1.15v
(+3.4 dBu)
1.07v
(+2.8 dBu)
1.07v
(+2.8 dBu)
1.24v
(+4.1 dBu)
1.15v
(+3.4 dBu)
1.07v
(+2.8 dBu)
1.07v
(+2.8 dBu)
Voltage Gain @ 8 ohms

33.4x
(30.5 dB)
44.7x
(33 dB)
56.2x
(35 dB)
64.0x
(36.1 dB)
33.4x
(30.5 dB)
44.7x
(33 dB)
56.2x
(35 dB)
Output Circuitry Class AB Class AB Class H Class H, 3 Tier Class AB Class AB Class H
THX Approved - THX Approved THX Approved - - - -
Weight - Net

36 lbs
(16.3 kg)
42 lbs
(19 kg)
47 lbs
(21.3 kg)
68 lbs
(30.8 kg)
44 lbs
(20.0 kg)
49 lbs
(22.3 kg)
57 lbs
(26 kg)
Weight - Shipping

42 lbs
(19.1 kg)
48 lbs
(22 kg)
53 lbs
(24.0 kg)
77 lbs
(34.4 kg)
50 lbs
(22.7 kg)
55 lbs
(25 kg)
63 lbs
(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 (direct outputs) Greater than 200 at 8 ohms, ISA 1350 greater than 250
Output Regulation (isolated outputs) Less than 1.5 dB
Input Impedance 10 k ohms unbalanced, 20 k ohms balanced
Input Clipping 10 Vrms (+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
19" (48.3 cm) rack mounting, 5.25"(13.3cm) tall (3 rack spaces), 
15.9" (40 cm) deep (from front mounting rails)
Amplifier Protection Full short circuit, open circuit, thermal, ultrasonic, and RF protection;
Stable into reactive or mismatched loads
Power Requirements 120, 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


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