12% OFF Total PURCHASE Over $249 Promo Code: SAVE12 Details

QSC ISA 300 Ti 300 Watt Power Amplifier

*Roll over image to zoom

*Click image to zoom


Orders received by 3PM ET ship same business day.
In-stock orders only.
Placed before 3PM EST
Mon-Fri (excluding Holidays).
Some exclusions apply.
Item#: ISA300TI
UPC: 684284044990
Availability: In Stock Online
Check In-Store Availability

I DJ NOW - Babylon, NY
Mon - Sat 10am - 8pm
Sun 11am - 5:00pm

I DJ NOW - Queens, NY
Mon - Fri 10am - 9pm
Sat 10am - 7pm
Sun 12 noon - 6pm

Financing Options Available

Financing Options Available:

Simply put, our financing plans allow you to get the gear you need now, at the price you want, with the time to pay, on your terms.

See How Easy It Is To Apply
Free Standard Shipping

Free Shipping Details:

Free Shipping on most orders with minimum purchase of $50 or more for a limited time. Ground shipments only in the lower 48 contiguous United States. Excludes oversized or overweight items such as oversized speakers, oversized cases, trussing & staging. Other exclusions include some fluids, some parts & special orders. Any questions, please call 1-800-355-7746 during normal business hours. Offer subject to change or termination without notice. Not responsible for typographical errors.



The lowest price is not always the best price. When you shop with us, you can always expect to get our BestPrice+Plus guaranteed.

Learn More
Seen It For Less?

2-Yr Extended Consumer Priority Service:

Protect your investment with a warranty from Consumer Priority Service. Buying a Consumer Priority Service extended protection service plan from I DJ NOW, not only means you’re getting the highest level of customer service and peace of mind, but it also means you can rest assured in the event your product does need repairing. The repair center technicians are factory trained and authorized to repair your product and only use state of the art testing equipment needed to properly diagnose and repair your product. Why worry about not having a warranty long enough to cover the majority of use? Simply purchase this affordable and sensible extended warranty now and be worry free!

Questions? Contact Us.

About This Product

QSC ISA 300 Ti 300 Watt Power Amplifier

This ISA300Ti amplifier includes a selectable high-pass filters 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. Selectable high-pass filters are included to protect speakers and prevent speaker transformer saturation with minimal effect on program material. Versatile loading options and a comprehensive feature set make the ISA Series a rugged, cost-effective power solution for any permanently installed sound system.

ISA300Ti Features:

• Low-impedance and isolated 25, 70, and 100 volt outputs for distributed audio systems available simultaneously.
• 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 (50 Hz or 75 Hz).
• Front panel indicators include power, signal, and clip.
• 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.
• Simple barrier strip connection determines output mode.
QSC ISA300 Ti Specifications
  STEREO MODE, Both Channels Driven
8 ohms 20 Hz-20 kHz 0.1% THD 185W
4 ohms 20 Hz-20 kHz 0.1% THD 280W
2 ohms 1 kHz 1% THD 430W
70V 20 Hz-20 kHz +0/-0.3 dB 0.5% THD -
70V or 100V 50 Hz-16 kHz 0.5% THD 300W
25V 50 Hz-16 kHz 0.5% THD 200W
8 ohms 1 kHz 0.1% THD 600W
4 ohms 1 kHz 1% THD 830W
140V or 200V 50 Hz-16 kHz 0.5% THD 600W
Signal to Noise (20 Hz-20 kHz) 100 dB
Distortion (SMPTE-IM) Less than 0.01%
Input Sensitivity @ 8 ohms 1.15v
(+3.4 dBu)
Voltage Gain @ 8 ohms

(30.5 dB)
Output Circuitry Class AB
THX Approved -
Weight - Net

44 lbs
(20.0 kg)
Weight - Shipping

50 lbs
(22.7 kg)
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 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
The ISA 300 Ti 300 Box Includes:
(1) QSC ISA 300 Ti 300 Watt Power Amplifier
(1) AC Power Cord
(4) Rubber Feet
(1) Rear Rackmount Kit
(2) 3-Pin Terminal Block Connectors
(1) User Manual