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Everything in Music Since 1958
Everything in Music Since 1958

QSC ISA500Ti ISA Ti Series 1.4kW Installation Amplifier

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Original price $1,245.00 - Original price $1,245.00
Original price
Default Title: $1,245.00
Current price $1,245.00
About Inventory Status

Call or text us at 301-946-8808.

In stock: It is in stock and available to ship or pickup. Apparel must be shipped from another location and is not available for in-store pickup. We can usually ship or have these items available for pickup by the next business day if they don't require inspection, special handling, or setup. Our pickup location is 11151 Veirs Mill Rd. Silver Spring, MD 20902.

📆 Preorder: It is on the way to our warehouse. We can't predict when preorder items will arrive due to current supply chain issues. If you place an order for one of these items someone will contact you to estimate the delivery date.

Out of stock: We don't currently have it available but you're not out of luck yet. We still may be able to get it. If you order one of these items we will contact you with an estimated fulfillment date. You have the option to cancel the order if you change your mind.

Special order: The item is so special that it needs to be custom ordered for you. Some of these items are works of art and have to be made individually. Orders for special order items must be prepaid and we cannot accept cancellations or refunds.

█ Sold out: We don't think we can get this item because it was either discontinued by the manufacturer or was limited in quantity. If you want or need this item call or text us. Sometimes we can help you track down the item through other sources or help you find something similar.

About Item Conditions

Call or text us at 301-946-8808.

New: The item is brand new as received from the manufacturer with a full manufacturer warranty. Instruments such as guitars, snare drums, drum kits, brass and woodwind instruments may be opened for photography and quality control inspection and may not be in a factory sealed box.

Mint or Open Box: The item may have been opened and tested but has been repackaged. The original packaging may have superficial issues but the item itself and any originally included accessories are in perfect, like new condition.

Display Model: These items are so cool that we put them on display in our legendary shop. The condition is brand new as received from the manufacturer with manufacturer warranty. Rest assured, these items undergo a very careful inspection before shipping.

Demo: These items have been on our sales floor for demo purposes and will likely show signs of use. The original packaging may no longer be included, but you can be assured that you are receiving an awesome item and an awesome price.

Used: The item is used. These item may have varying degrees of wear. Please read the description for information about the condition of the item. Used items do not carry a warranty.

B or C Stock: Factory refurbished. These items were purchased from the manufacturer in a refurbished condition. They will show some cosmetic issues, but nothing that would impact performance. Being that these are sealed from the manufacturer, we generally do not open these to photograph the cosmetic issues. They are guaranteed to work and may have a limited warranty or you may purchase an extended warranty in some cases. Please see the listing description for item specific information.

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Get An Adaptable And Reliable Amp For Your Facility With The QSC ISA500Ti ISA Ti Series 1.4kW Installation Amplifier

Designed as a cost-effective solution specifically for sound contractors, the ISA Series features versatile loading options and a comprehensive feature make it a rugged power solution for any permanently installed sound system.

Unique among distributed sound power amplifiers, the "Ti" versions of the ISA series 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 ISA 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.

  • 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
  • 3-year warranty plus optional 3-year extended service contract


  • 8 Ohms, 20 Hz-20 kHz 0.1% THD: 260W
  • 4 Ohms, 20 Hz-20 kHz 0.1% THD: 425W
  • 2 Ohms, 1 kHz 1% THD: 700W


  • 70V or 100V, 50-Hz-16 kHz 0.5% THD: 500W
  • 25V, 50 Hz-16 kHz 0.5% THD: 300W


  • 8 Ohms, 1 kHz 0.1% THD: 900W 
  • 4 Ohms 1 kHz 1% THD: 1400W


  • 140V or 200V, 50 Hz-16 kHz 0.5% THD: 1000W


  • 20 Hz-20 kHz: 10 dB below rated power: Less than 0.03% THD, 4 ohms and 8 ohms
  • 1.0 kHz and below: full rated power: Less than 0.03% THD, 4 ohms and 8 ohms


  • Signal to Noise (20 Hz-20 kHz): 100 Db
  • Distortion (SMPTE-IM): Less than 0.01%
  • Input Sensitivity @ 8 ohms: 1.07 V (+2.8 dBu)
  • Maximum Voltage Gain: 44.7× (33 dB)
  • Output Circuitry: Class AB
  • 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 with 8 Ohms Load (direct outputs): Greater than 200; ISA 1350 greater than 250
  • Output Regulation (isolated outputs): Less than 1.5dB
  • Input Impedance: 10k Ohms unbalanced, 20 k Ohms 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)
  • 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

Manufacturer: QSC Audio
Model: ISA500TI
SKU: I279848-N-0-WHXD
UPC: 684284045003

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Maryland, Virginia, and Washington DC's legendary music shop. Family-owned and operated since 1958. Buy gear the way it was meant to be bought, from a store that's been there through it all and has the vibe to prove it. We're staffed with musicians and industry experts, people that live and breathe music gear. Our mission is to help you find the right gear for your project, that thing that will bring you the most joy out of what you do. We're an authorized dealer for almost every brand, we stock items the other stores don't, so you can try before you buy. Stop by our Wheaton, MD showroom and see for yourself.

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