Instruction/ maintenance manual of the product ISA 500T QSC Audio
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User Manual ISA Audio Power Amplifiers ISA Series Installed Sound Amplifiers TD-000093-00 rev .C *TD-000093-00* n ISA 300T n ISA 500T n ISA 800T n ISA 280 n ISA 450 n ISA 750.
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE THE COVER. NO USER- SERVICEABLE P ARTS INSIDE. REFER SERVICING TO QUALIFIED PERSONNEL. FCC INTERFERENCE ST A TEMENT NOTE: This equipment has been tested and found to comply with the limits for a class B digital device, pursuant to part 15 of the FCC rules.
INTRODUCTION: ISA Series Overview .......................................................................................4 Front Panel Illustration .........................................................................................4 Rear Panel Illustrations .
FRONT PANEL (all models) Thank you for the purchase of your new ISA amplifier . T o 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 .
1. Gain Controls 2. T erminal Block Inputs 3. DataPort V2 Connector 4 . XLR Inputs.
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.
FEA TURES & SETUP- LED INDICA TORS CLIP : red LED that illuminates when the amplifier clips. Normal indication: illumination briefly at extreme output power peaks. Occasional clipping (once briefly every few seconds) when operation at high power levels is normal.
FEA TURES & SETUP- GAIN CONTROLS & INPUT JACKS 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.
DA T APORT 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.
FEA TURES & SETUP- STEREO & P ARALLEL OPERA TING MODES P ARALLEL: The channel 1 and channel 2 inputs are connected together , applying a single input signal to both channels of the amplifier . A signal into any input jack will drive both channels.
FEA TURES & SETUP- STEREO & P ARALLEL MODE DIP SWITCH SETTINGS ISA 280, ISA 450, ISA 750: Refer to the switch setting keys for each mode, to the right. These keys are printed on the amplifier ’ s rear panel for easy reference when you are behind the equipment rack.
FEA TURES & SETUP- BRIDGE OPERA TING MODE & DIP SWITCH SETTINGS BRIDGE MODE OPERA TION- Note that speaker connection for bridge mono mode is different than other modes. See section on Connections: Outputs for proper bridge mode output connections.
FEA TURES & SETUP- LOW FREQUENCY FIL TER & DIP SWITCH SETTINGS SETTING THE FIL TER DIP SWITCHES- 1- Set switch #3 and #8 to the on or off position as desired. 2- Select the desired roll-off frequency at switch #2 and #9. 3- If filter off is selected, the frequency selection has no effect.
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FEA TURES & SETUP- CLIP LIMITER & DIP SWITCH SETTINGS CAUTION: Clip limiting reduces extreme overdrive peaks, allowing a higher average signal level without audible distortion. However , increasing the gain with the clip limiter engaged, until clipping is again audible, can double the average output power .
INST ALLA TION: RACK MOUNTING AND MOUNTING DIMENSIONS 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.
INST ALLA TION: COOLING REQUIREMENTS & AC MAINS FAN COOLING- Keep the front and rear vents clear to allow full air flow . Make sure that plenty of cool air can enter the rack, especially if there are other units which exhaust hot air into it.
Unbalanced inputs : Connect the conductors to the connector as shown. Make sure that the unused side of the balanced input is connected to ground, as shown.
CONNECTIONS: INPUTS- DA T APORT 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.
CONNECTIONS: OUTPUTS- USING THE SCREW TERMINAL CONNECTIONS GENERAL- The screw terminal output connections are protected by a hinged plastic cover . T o 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.
CONNECTIONS: OUTPUTS- DIRECT LOW IMPEDANCE (LO-Z) BRIDGE MODE PRECAUTIONS: Do Not Use 2 ohm Loads in Bridge Mono Mode! 4 ohms is the minimum impedance for bridge mono operation! This mode puts a high demand on the amplifier and speaker . Excessive clipping may cause protective muting or speaker damage.
CONNECTIONS: OUTPUTS- DISTRIBUTED HIGH IMPEDANCE (HI-Z) , STEREO & P ARALLEL.
CONNECTIONS: OUTPUTS- DISTRIBUTED HIGH IMPEDANCE (HI-Z) , BRIDGE MODE OUTPUT TERMINAL SAFETY WARNING! Do not touch output terminals while amplifier power is on.
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.
CONNECTIONS: SECURING OUTPUT WIRING TO CHASSIS.
OPERA TION: AC POWER SWITCH, LED INDICA TORS, GAIN CONTROLS NORMAL OPERA TING LEVELS The amplifier ’ s protective muting system guards against excessive internal temperatures. With normal ventilation and 4 to 8 ohm loads, the amplifier will handle any signal level, including overdrive.
APPLICA TIONS: GENERAL APPLICA TION INFORMA TION The ISA 280, ISA 450 and ISA 750 amplifiers are optimized for directly driving low impedance loads. Low impedance (Lo-Z) loads are those loads between 2 and 16 ohms. These models are not suitable for driving “ constant voltage ” 70V lines.
APPLICA TIONS: LOW FREQUENCY FIL TERING & DISTRIBUTED OUTPUTS The low frequency filtering is another difference in the characteristics of the “ non-T ” and the “ T ” amplifiers.
100 V olt, two-zone example: The illustration to the right shows a typical two-zone 100 volt system. When using 100 volt speaker loads, make sure that connec- tions to the amplifier are made to the 100 volt output terminals. If using the ISA 300T , 300 watts per channel (zone) can be delivered.
APPLICA TIONS: MUL TIPLE LOW IMPEDANCE LOADS IN SERIES (all models).
APPLICA TIONS: MUL TIPLE LOW IMPEDANCE LOADS IN P ARALLEL (all models).
32 The DSP-3 Digital Signal Processing Module provides compressor -limiter , multiple parametric filters, high- and low-pass filters, shelf filters, multiple delays, polarity reversal, muting and attenuation. These features and more come packed into a small module that interfaces with the DataPort V2 connector on the rear of your ISA amplifier .
• INDICA TION: CLIP LED FLASHING • If the red clip indicator flashes when signal is applied, the amplifier output may be shorted. Check that the speaker cable connec- tions are tight and reliable at both ends. Check the speaker cables for stray strands or breaks in the insulation.
PROBLEM: DISTORTED SOUND Magnetic field from power supplies in equipment can induce hum into cabling that is located in the field. If hum is a problem, try relocating cabling so that is away from power supplies, transformers and other magnetic field producing devices.
SPECIFICA TIONS ISA 280 ISA 450 ISA 750 OUTPUT POWER in watts FTC: 8 ohms per channel (20-20k Hz., 0.1% THD) 185 260 450 4 ohms per channel (20-20k Hz., 0.1% THD) 280 425 650 EIA: 16 ohms (1 kHz., 0.1% THD, 1 channel driven) 100 140 250 8 ohms (1 kHz, 0.
SPECIFICA TIONS ISA 280 ISA 450 ISA 750 AMPLIFIER PROTECTION Full short circuit, open circuit, thermal, ultrasonic and RF protection. Stable into reactive or mismatched loads.
SPECIFICA TIONS ISA 300T ISA 500T ISA 800T OUTPUT POWER in watts Low Impedance FTC: 8 ohms per channel (20-20k Hz., 0.1% THD) 185 260 450 4 ohms per channel (20-20k Hz., 0.1% THD) 280 425 650 Low Impedance EIA: 16 ohms (1 kHz., 0.1% THD, 1 channel driven) 100 140 250 8 ohms (1 kHz, 0.
SPECIFICA TIONS ISA 300T ISA 500T ISA 800T AMPLIFIER PROTECTION Full short circuit, open circuit, thermal, ultrasonic and RF protection. Stable into reactive or mismatched loads.
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 .
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 T rademark Office.
An important point after buying a device QSC Audio ISA 500T (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
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If you already are a holder of QSC Audio ISA 500T, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime QSC Audio ISA 500T.
However, one of the most important roles played by the user manual is to help in solving problems with QSC Audio ISA 500T. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device QSC Audio ISA 500T along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
