QSC ISA500Ti Two-Channel 500 Watts at 70V Power Amplifier

The ISA 500TI Installed System Amplifier are designed to meet the needs of sound system designers and contractors worldwide. Three models feature isolated 25, 70, and 100 volt outputs for distributed sound systems, while four low impedance models are rated for 2 ohm operation

QSC ISA500Ti 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

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	-			-	-	-	-
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 ohmsLess 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