Related Manuals for QSC ISA 300T
Summary of Contents for QSC ISA 300T
- Page 1 ISA Series Installed Sound Amplifiers User Manual *TD-000093-00* TD-000093-00 rev.C ISA Audio Power Amplifiers ISA 300T ISA 500T ISA 800T ISA 280 ISA 450 ISA 750...
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Page 2: Important Safety Precautions
SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED PERSONNEL. Model: ISA ________________________________ Serial Number:______________________________ Date of Purchase:____________________________ Purchased From:_____________________________ © Copyright 2000, QSC Audio Products, Inc. QSC® is a registered trademark of QSC Audio Products, Inc. All trademarks are the property of their respective owners. -
Page 3: Table Of Contents
DataPort V2 Application Information ...32 TROUBLESHOOTING ...33 SPECIFICATIONS ...35 WARRANTY INFORMATION ...39 HOW TO CONTACT QSC AUDIO PRODUCTS ...39 Daisy Chaining to Other Devices from the DataPort V2 ...9 DIP Switch Settings ...11 DIP Switch Settings ...12 DIP Switch Settings ...13... -
Page 4: Isa Series Overview
INTRODUCTION- INTRODUCTION AND FRONT PANEL ILLUSTRATION Thank you for the purchase of your new ISA amplifier. To get the most out of your amplifier, review this manual carefully. The installation, connection and operation sections provide useful guidelines to get you up and running quickly and correctly. The QSC shipping box should contain: 1- The amplifier 2- This user manual... -
Page 5: Rear Panel Illustrations
3. DataPort V2 Connector 8. Output Connections, Low Impedance 4. XLR Inputs NOTE! Output connection terminals shown without protective cover in place for clarity (rear panel, above & below). REAR PANEL ISA 300T ISA 500T ISA 800T 1. Gain Controls 5. Mode Switches 2. -
Page 6: Features & Setup
FEATURES & SETUP- The front panel of ISA series amplifiers is tailored for installed sound. The power switch is the only front panel control; gain controls are located on the rear panel to minimize control tampering. LED indicators are provided for power, input signal and to warn of clipping. -
Page 7: Led Indicators
FEATURES & SETUP- POWER: green LED that illuminates when the power switch is set to the on position and AC power is present at the IEC cord receptacle. Normal indication: at power-on the LED will illumi- nate at half-brightness for 2-3 seconds, then it illumi- nates to full-brightness. -
Page 8: Gain Controls
FEATURES & SETUP- GAIN CONTROLS- The Gain controls are located on the rear panel to minimize control tampering after installation. When viewing the amplifier from the rear, they are on the left end, top and bottom, as shown in the illustration to the right. The Gain controls are detented (11 steps) for repeatable adjustment. -
Page 9: Dataport V2 Connector
FEATURES & SETUP- DATAPORT V2- What It Is- The DataPort V2 is used for connection to optional QSC DataPort accessories. DataPort accessory devices can provide remote cinema monitoring, DSP, filter and crossover functions. The “V2” DataPort connection is a “version-2” of QSC’s original DataPort. -
Page 10: Stereo & Parallel Operating Modes
FEATURES & SETUP- STEREO: Each input signal is sent to its respective channel. Each channel has independent low-frequency (subaudio) filtering, clip limiting, gain control, and output connection. When to use STEREO input configuration: Use stereo mode for stereo sources (L-R inputs) and any other situation that requires each channel to be completely separate from the other. -
Page 11: Dip Switch Settings
Set switch #3, 4 and #5 to the right. Set switch #6, 7 and #8 to the left. STEREO & PARALLEL MODE DIP SWITCH SETTINGS ISA 280, ISA 450 and ISA 750 mode switches. ISA 300T, ISA 500T and ISA 800T mode switches. -
Page 12: Bridge Mono Operating Mode
Switch #10 should be set to its left-side position. See chart, above. ISA 300T, ISA 500T and ISA 800T models: switches #3, 4, 5, 6, 7 and #8 must all be set to the right-side position. Switch #10 should be set to its... -
Page 13: Low Frequency Filter
Filtering for 70-100V Systems”, page 28. LOW FREQUENCY FILTER & DIP SWITCH SETTINGS ISA 300T, ISA 500T and ISA 800T’s have selectable roll-off frequencies of 50 and 75 hertz. The frequency is determined by the frequency selection DIP switch. The low frequency filter is always active and is not defeatable. -
Page 14: Frequency Response Curves
FEATURES & SETUP- Frequency response curve for: Filter OFF Frequency response curve for: Note! There is no “Filter OFF” selection on “T” models. FREQUENCY RESPONSE CURVES ISA 280 ISA 450 ISA 750 ISA 300T ISA 500T ISA 800T... -
Page 15: Clip Limiter
FEATURES & SETUP- When the audio input signal drives the amplifier’s output circuit beyond its power capability, the amplifier clips and flattens the peaks of the waveform. This flattening is what we hear as distortion during the clipping “event”. Clipping for short periods can be harmless. Clipping for extended periods can easily damage high frequency drivers (tweeters, horns) . -
Page 16: Installation
INSTALLATION: RACK MOUNTING AND MOUNTING DIMENSIONS NOTE: Rack mounting of amplifier is optional. Securing the Front Ears to the Rack Rails Use four screws and washers when mounting the ISA amplifier to the front rails. Support the weight of the amplifier while securing it to the rails to avoid bending or distorting the front rack mount ears. -
Page 17: Cooling Requirements
INSTALLATION: COOLING REQUIREMENTS & AC MAINS FAN COOLING- All QSC amplifiers draw cool air into the rear of the amplifier and exhaust the hot air from the front. This is done so that the equipment in the rack stays as cool as possible. This method of cooling also gives the technician “direct”... -
Page 18: Connections
CONNECTIONS: INPUTS- XLR & TERMINAL BLOCK Each channel has active balanced "Euro-style" terminal block and XLR input jacks wired in parallel. The input impedance is 20k ohm balanced or 10 k ohm unbalanced. Unused input jacks may be daisy chained to additional amplifiers. Balanced connection is recommended. -
Page 19: Inputs: Dataport V2 Connections And Notes
CONNECTIONS: INPUTS- DATAPORT V2 The ISA series of amplifiers come with a DataPort V2 connector that may be used for connecting to accessory QSC DataPort devices. The V2 (or version 2) DataPort does not have the full capability of the standard DataPort. The DataPort V2 must be connected to a QSC DataPort product with a QSC DataPort cable;... -
Page 20: Outputs: Using The Screw Terminal Connections
CONNECTIONS: OUTPUTS- GENERAL- The screw terminal output connections are protected by a hinged plastic cover. To make connections to the screw terminals, you will need to swing the cover door open. Gently pry the cover with your finger tips on the side that has the wire openings. -
Page 21: Outputs: Direct Low Impedance (2-16 Ohm Loads)
ISA amplifiers are equipped with screw-terminal output connections. The ISA 280, ISA 450 and ISA 750 provide low-impedance outputs only (2 to 16 ohms) while the ISA 300T, ISA 500T and ISA 800T provide both low-impedance and high-impedance (25V, 70V and 100V) outputs. -
Page 22: Outputs: Distributed High Impedance ("T" Models Only)
OUTPUTS- The ISA 300T, ISA 500T and ISA 800T amplifiers have high impedance (Hi-Z) outputs suitable for driving 25, 70, and 100 volt distributed audio lines. These loads should be driven by the amplifier in stereo or parallel modes. For 140 volt or 200 volt output, the amplifier must be configured for bridge mode. - Page 23 CONNECTIONS: OUTPUTS- BRIDGE mode operation combines the output power of both channels into one channel that has twice the “normal” voltage swing. This means that in BRIDGE mode, the high impedance distributed outputs can provide 140 volt (70 volt + 70 volt) and 200 volt (100 volt + 100 volt) drive.
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Page 24: Power Sharing Between High And Low Impedance Outputs ("T" Models Only)
CONNECTIONS: POWER SHARING BETWEEN HIGH & LOW IMPEDANCE OUTPUTS The ISA 300T, ISA 500T and ISA 800T models are equipped with autotransformer-coupled, high impedance (High-Z) outputs. They are also equipped with low impedance (Low- Z) “direct” outputs. The high impedance outputs are not isolated. -
Page 25: Securing Output Wiring To The Chassis
CONNECTIONS: SECURING OUTPUT WIRING TO CHASSIS Part of any quality sound system installation is ensuring that your connections remain tight and reliable over time. Making high quality terminations to the screw terminals is one part of that reliability equation. Keeping those terminations from moving is the other part. If the connections are prevented from stress and strain, they should remain reliable. -
Page 26: Operation
OPERATION: AC POWER SWITCH, LED INDICATORS, GAIN CONTROLS AC POWER SWITCH Before applying power, check all connections and turn down the gain controls. When the AC power is switched on, the power indicator LED will light at half brightness and the fan will start. The outputs are muted. -
Page 27: General Notes, Distributed Line Principles
The ISA 300T, ISA 500T and ISA 800T amplifiers have the additional capability of driving constant voltage distributed audio lines of 25, 70 and 100 volts. The outputs are autotransformer coupled; they are not fully isolated. These autotransformer equipped models also have low impedance outputs for added flexibility of system design and configuration. -
Page 28: Low Frequency Filtering, Distributed Output Examples
25 volt output terminals. If using the ISA 300T, 300 watts per channel (zone) can be delivered. Make sure that the total speaker power load on each channel does not exceed 300 watts. - Page 29 70 volt output terminals. If using the ISA 300T, 300 watts per channel (zone) can be delivered. Make sure that the total speaker power load on each channel does not exceed 300 watts.
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Page 30: Applications
APPLICATIONS: MULTIPLE LOW IMPEDANCE LOADS IN SERIES (all models) Multiple Lo-Z Loads in Series: Series connection is where the same signal current flows through each of the speaker loads. The signal goes into one terminal of the first speaker and out its other terminal; then the signal goes into one terminal of the next load, and so on. - Page 31 APPLICATIONS: MULTIPLE LOW IMPEDANCE LOADS IN PARALLEL (all models) Multiple Lo-Z Loads in Parallel: If each speaker load is connected across the same signal source (the output of the amplifier), then the loads are in parallel with one another. If one of the speakers fails in a parallel-connected system branch, the remaining speakers will continue to operate.
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Page 32: Dataport V2 Application Information
APPLICATIONS: DataPort V2 (all models) Below are listed the available QSC DataPort-compatible products that will interface with your ISA amplifier. This list will continuously change as new products become available and old products are discontinued. Always use a QSC DataPort cable for remote equipment interconnect. -
Page 33: Troubleshooting
TROUBLESHOOTING: Problem: NO SOUND • INDICATION: POWER LED INDICATOR NOT ILLUMINATED • Check both ends of the AC line cord for proper connection. Both ends should be fully seated in their connectors. • Check that the AC outlet works by plugging in a known-good device or by testing with a voltmeter. If too many amplifiers are used on one outlet, the building's circuit breaker may trip and shut off power. - Page 34 TROUBLESHOOTING: PROBLEM: DISTORTED SOUND • INDICATION: CLIP LED FLASHING • If the red clip indicator flashes before the signal indicator does, the load impedance is abnormally low or shorted. Unplug each speaker one-by-one at the amplifier. If the clip LED goes out when you disconnect a cable, then that cable or speaker is shorted. Try another cable and speaker to locate and/or remove the fault.
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Page 35: Specifications
SPECIFICATIONS OUTPUT POWER in watts FTC: 8 ohms per channel (20-20k Hz., 0.1% THD) 4 ohms per channel (20-20k Hz., 0.1% THD) EIA: 16 ohms (1 kHz., 0.1% THD, 1 channel driven) 8 ohms (1 kHz, 0.1% THD, 1 channel driven) 4 ohms (1 kHz, 0.1% THD, 1 channel driven) 2 ohms (1 kHz, 1% THD, both channels driven) Bridged Mono:... - Page 36 SPECIFICATIONS AMPLIFIER PROTECTION COOLING INDICATORS CONNECTORS LOAD PROTECTION OUTPUT CIRCUIT TYPE POWER REQUIREMENTS POWER CONSUMPTION @ 120 VAC, typical (both channels driven) Idle 1/8 power, 8 ohms* 1/8 power, 4 ohms* 1/8 power, 2 ohms* NOTE: 1/8 power is representative of current draw with typical music program material with occasional clipping. *Pink noise CONTROLS (all models) DIMENSIONS (all models) WEIGHT...
- Page 37 SIGNAL to NOISE (unweighted, 20-20k Hz.) VOLTAGE GAIN (gain control set to 0 dB) INPUT SENSITIVITY for rated power into 8 ohms INPUT CLIPPING, Vrms (all models) INPUT IMPEDANCE (all models) ISA 300T ISA 500T 1400 1000 1000 2 dB at 4 ohms LESS THAN 0.01%...
- Page 38 NOTE: 1/8 power is representative of current draw with typical music program material with occasional clipping. *Pink noise CONTROLS (all models) DIMENSIONS (all models) WEIGHT (all models) kg.) ISA 300T ISA 500T Full short circuit, open circuit, thermal, ultrasonic and RF protection. Stable into reactive or mismatched loads. Continuously variable speed fan; back-to-front air flow.
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Page 39: Warranty Information
WARRANTY your dealer or distributor) Disclaimer QSC Audio Products, Inc. is not liable for any damage to speakers, amplifiers, or any other equipment that is caused by negligence or improper installation and/or use of the ISA amplifier. Product Warranty QSC guarantees the ISA amplifier to be free from defective material and/or workmanship for a period of three years from the date of sale, and will replace defective parts and repair malfunctioning products under this warranty when the defect occurs under normal installation and use—provided the unit is returned to our factory via prepaid transportation with a copy of the... - Page 40 QSC Audio Products, Inc. 1675 MacArthur Boulevard Costa Mesa, California 92626 USA “QSC” and the QSC logo are registered with the U.S. Patent and Trademark Office. ©2000 QSC Audio Products, Inc.