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
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
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
QSC ISA 450 Installation Amplifier
$1,060.00
Special Order
Description
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
(+3.4 dBu)
(+2.8 dBu)
(+2.8 dBu)
(+4.1 dBu)
(+3.4 dBu)
(+2.8 dBu)
(+2.8 dBu)
(30.5 dB)
(33 dB)
(35 dB)
(36.1 dB)
(30.5 dB)
(33 dB)
(35 dB)
(16.3 kg)
(19 kg)
(21.3 kg)
(30.8 kg)
(20.0 kg)
(22.3 kg)
(26 kg)
(19.1 kg)
(22 kg)
(24.0 kg)
(34.4 kg)
(22.7 kg)
(25 kg)
(28.6 kg)
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
10 dB below rated output power
20 Hz-20 kHz, +0/-1 dB; -3 dB points: 5 Hz and 50 kHz
Direct outputs: -3 dB @ 50 Hz, -0.5 dB @ 20 kHz; XF outputs: 50 Hz-16 kHz, +1/-3 dB
Output: Covered barrier strips
DataPort V2: HD-15 connector
Rear: Ch. 1 and Ch. 2 gain knobs, 10-position DIP switch
CLIP: Red LED (1 per channel)
15.9″ (40 cm) deep (from front mounting rails)
Stable into reactive or mismatched loads
Additional information