ISA750 Power Amplifier
- 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
- Two-tier Class H complementary bipolar output circuitry reduces AC power draw and waste heat by 40%
- 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
- 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 |
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 WARNING: This product contains chemicals including Styrene which is known to the state of California to cause cancer, and Bisphenol A (BPA), which is known to the state of California to cause birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
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