Premier Service Center Certification: Loudspeakers

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Premier Service Center Certification: Loudspeakers - Quiz


Thank you for taking the time to participate in the QSC Premier Service Center Certification program.
To become a QSC Premier Service Center, you must pass four tests built off the online training material courses. This certification program is intended to allow your Service Center become fully capable and knowledgeable in servicing QSC products professionally and reliably.
This fourth and final test will cover general knowledge about loudspeaker repair and testing. Good luck!


Questions and Answers
  • 1. 

    Which company makes the recommended audio analyzing equipment used for QSC loudspeaker repairs?

    • A.

      QSC

    • B.

      NTI

    • C.

      JBL

    • D.

      Audio Labs

    Correct Answer
    B. NTI
    Explanation
    NTI is the company that manufactures the recommended audio analyzing equipment used for QSC loudspeaker repairs.

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  • 2. 

    Is it possible to check the condition of the drivers with an ohmmeter from the outer terminals of a passive speaker w/ crossover?

    • A.

      Yes

    • B.

      No

    Correct Answer
    B. No
    Explanation
    It is not possible to check the condition of the drivers with an ohmmeter from the outer terminals of a passive speaker with a crossover. The ohmmeter measures resistance, and the drivers in a speaker are typically low impedance voice coils, which have very low resistance. However, the crossover network in a passive speaker introduces additional components such as capacitors and inductors, which can affect the readings on an ohmmeter. To accurately check the condition of the drivers, it is necessary to disconnect them from the crossover and measure their resistance individually.

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  • 3. 

    If a non-flyable speaker has been flown or it's rigging points been modified, what should you check very carefully?

    • A.

      The enclosure and mounting points.

    • B.

      The low frequency driver.

    • C.

      The high frequency driver.

    • D.

      The pole-cup assembly.

    Correct Answer
    A. The enclosure and mounting points.
    Explanation
    If a non-flyable speaker has been flown or its rigging points have been modified, it is important to check the enclosure and mounting points very carefully. This is because any changes in the rigging points or flying of the speaker can put extra stress on the enclosure and mounting points. Checking these components ensures that they are still secure and capable of supporting the speaker safely.

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  • 4. 

    To check the overall frequency response of a loudspeaker, what test methods should you use?

    • A.

      Source: Pink Noise, Analyzing: 1/3 Octave RTA

    • B.

      Source: 1/3 Octave Filter, Analysis: 1/3 Octave RTA

    • C.

      Source: WhitePink Noise, Analysis: 1/3 Octave RTA

    • D.

      Source: Pink Noise, Analysis: 46 Octave RTA

    Correct Answer
    A. Source: Pink Noise, Analyzing: 1/3 Octave RTA
    Explanation
    To check the overall frequency response of a loudspeaker, you should use the method of using Pink Noise as the source and analyzing it with a 1/3 Octave RTA. Pink Noise is a type of noise that has equal energy per octave, making it suitable for testing the frequency response of a loudspeaker. Analyzing it with a 1/3 Octave RTA (Real-Time Analyzer) allows for a detailed analysis of the loudspeaker's response across different frequency bands, providing a comprehensive understanding of its overall frequency response.

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  • 5. 

    When a rub or buzzing occurs in a loudspeaker, which type of audio signal should be used to find the odd noises?

    • A.

      Sine wave

    • B.

      Pink noise

    • C.

      White noise

    • D.

      Square wave

    Correct Answer
    A. Sine wave
    Explanation
    A sine wave should be used to find odd noises in a loudspeaker because it is a pure tone that represents a single frequency. By playing a sine wave through the speaker and gradually increasing the frequency, any odd noises or distortions can be easily detected. This is because the sine wave allows for a clear and simple analysis of the speaker's response to different frequencies, making it an effective tool for troubleshooting and identifying any issues with the speaker's performance.

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  • 6. 

    If a driver is completely unresponsive, what should be checked in the loudspeaker? Mark all that apply.

    • A.

      Internal wiring

    • B.

      Driver continuity

    • C.

      Scratches on the enclosure

    • D.

      Power handling

    Correct Answer(s)
    A. Internal wiring
    B. Driver continuity
    Explanation
    In the case of a completely unresponsive driver, checking the internal wiring is important as there may be a loose or disconnected wire causing the issue. Additionally, checking the driver continuity is necessary to ensure that there are no breaks or faults in the driver itself. Scratches on the enclosure and power handling are not relevant to the driver's responsiveness and would not affect its functionality.

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  • 7. 

    If a recone kit is not available for a driver, how should the repair be handled?

    • A.

      Repair the driver with a recone kit from a different manufacturer.

    • B.

      Send the driver to a recone professional.

    • C.

      Replace the entire driver.

    • D.

      Ask Dan Akyrod from the Coneheads.

    Correct Answer
    C. Replace the entire driver.
    Explanation
    If a recone kit is not available for a driver, the best course of action would be to replace the entire driver. This is because recone kits are specifically designed to repair and restore the original functionality of a driver. If a recone kit from a different manufacturer is used, it may not fit properly or provide the same level of performance. Sending the driver to a recone professional is also a viable option, but it may be more cost-effective and efficient to simply replace the entire driver. Asking Dan Akyrod from the Coneheads is not a valid solution as it is not a reliable or professional source.

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  • 8. 

    If a replacement woofer comes without a gasket installed, what should you do?

    • A.

      Install a gasket around the driver frame.

    • B.

      Don't install a gasket, it was meant to be without one.

    • C.

      Install a gasket on the enclosure.

    • D.

      Use the gasket from the damaged woofer.

    Correct Answer
    A. Install a gasket around the driver frame.
    Explanation
    If a replacement woofer comes without a gasket installed, the appropriate action would be to install a gasket around the driver frame. The gasket helps to create a seal between the woofer and the enclosure, preventing air leakage and ensuring optimal sound quality. Without a gasket, there may be a loss of sound quality and potential damage to the woofer. Therefore, installing a gasket around the driver frame is necessary to ensure proper functioning of the replacement woofer.

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  • 9. 

    If deep cracks or breaks exist in the loudspeaker enclosure, what should be performed?

    • A.

      Complete enclosure replacement if possible.

    • B.

      Repair the enclosure yourself.

    • C.

      Send the enclosure to a professional for repair.

    • D.

      Send the enclosure back to QSC for repair.

    Correct Answer
    A. Complete enclosure replacement if possible.
    Explanation
    If deep cracks or breaks exist in the loudspeaker enclosure, the best course of action would be to perform a complete enclosure replacement if possible. This is because deep cracks or breaks can significantly affect the structural integrity of the enclosure and may compromise the overall performance and sound quality of the loudspeaker. It is important to ensure that the enclosure is in good condition to provide optimal sound reproduction.

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  • 10. 

    What does applying gasket between the driver frame and enclosure do?

    • A.

      Eliminates air leaks.

    • B.

      Keeps spots off your driveway.

    • C.

      Used for time alignment with the high frequency driver.

    • D.

      Shock mounting for improved coil instability.

    Correct Answer
    A. Eliminates air leaks.
    Explanation
    Applying a gasket between the driver frame and enclosure helps to eliminate air leaks. This is important because air leaks can negatively affect the performance and efficiency of the driver and enclosure system. By sealing any gaps or spaces between the driver frame and enclosure, the gasket ensures that there are no leaks, allowing for better control of air pressure and preventing any loss of sound or energy. This ultimately helps to optimize the overall performance and sound quality of the system.

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  • 11. 

    How should the mounting screws of a driver be tightened?

    • A.

      In a circle, clockwise

    • B.

      In a circle, counter-clockwise

    • C.

      In a random order

    • D.

      In a criss-cross pattern

    Correct Answer
    D. In a criss-cross pattern
    Explanation
    When mounting screws of a driver, they should be tightened in a criss-cross pattern. This means that the screws should be tightened in a diagonal pattern, alternating between opposite corners or sides. This method ensures that the driver is securely fastened and prevents any imbalance or stress on one side. Tightening the screws in a criss-cross pattern also helps distribute the pressure evenly, resulting in a more stable and secure mounting.

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  • 12. 

    What is the main purpose of tightening the driver mounting screws in a criss-cross pattern?

    • A.

      So the driver doesn't loosen while outputting audio.

    • B.

      So the driver plays more crisp and clear audio.

    • C.

      So the driver spins less in the enclosure.

    • D.

      So the frame of the driver does not distort because of uneven pressure.

    Correct Answer
    D. So the frame of the driver does not distort because of uneven pressure.
    Explanation
    Tightening the driver mounting screws in a criss-cross pattern helps to distribute the pressure evenly across the frame of the driver. This prevents the frame from distorting or warping due to uneven pressure, ensuring that the driver functions properly and produces high-quality audio without any distortion.

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  • 13. 

    During the final evaluation after a repair, which type of audio signals should be used to test? Mark all that apply.

    • A.

      Pink noise

    • B.

      Music

    • C.

      Square Wave

    • D.

      DC

    Correct Answer(s)
    A. Pink noise
    B. Music
    Explanation
    During the final evaluation after a repair, pink noise and music should be used to test the audio signals. Pink noise is a type of random noise that contains all frequencies within the audible range, making it ideal for testing the overall frequency response and tonal balance of an audio system. Music, on the other hand, is a complex signal that includes a variety of frequencies, dynamics, and instruments, allowing for a more realistic evaluation of the audio system's performance. Square wave and DC signals are not suitable for testing audio systems as they do not provide a wide range of frequencies or dynamics.

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  • 14. 

    In some AD-S series passive loudspeakers, the grille clip can be difficult to remove. What tool helps pull the grille clip out?

    • A.

      Bevel diagonal wire cutters

    • B.

      Flat pliers

    • C.

      Putty knife

    • D.

      Special grill clip removers manufactured by QSC.

    Correct Answer
    A. Bevel diagonal wire cutters
    Explanation
    Bevel diagonal wire cutters can be used to pull out the grille clip in some AD-S series passive loudspeakers. These wire cutters have a sharp angled blade that allows for a precise and easy grip on the grille clip, making it easier to remove. Flat pliers may not provide the same level of grip and control, while a putty knife may not be suitable for this task. Special grill clip removers manufactured by QSC are not mentioned as an option, so they are not the correct answer.

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  • 15. 

    If a PASSIVE loudspeaker has "distorted sound, or no sound from the loudspeaker", what should be done first before anything else?

    • A.

      Verify the customer's complaint.

    • B.

      Open the speaker enclosure.

    • C.

      Check the driver independently.

    • D.

      Check the crossover assembly.

    Correct Answer
    A. Verify the customer's complaint.
    Explanation
    Before anything else, it is important to verify the customer's complaint. This involves understanding and confirming the specific issue the customer is experiencing with the passive loudspeaker. By doing so, it allows the technician to accurately diagnose and address the problem. This step is crucial as it ensures that the subsequent actions taken, such as opening the speaker enclosure, checking the driver, or checking the crossover assembly, are relevant and targeted towards resolving the customer's complaint effectively.

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  • 16. 

    When HF driver or crossover assembly is blown on the AD-S52 and AD-S82 speakers, the speaker should be repaired under warranty because the driver is weak. True or False.

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    The correct answer is False. The speaker should not be repaired under warranty because the driver is weak. The warranty typically covers manufacturing defects or faults, but not issues caused by wear and tear or damage due to misuse. If the HF driver or crossover assembly is blown, it is likely due to excessive power or improper usage, which would not be covered under warranty.

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  • 17. 

    What is the most common failure mode in the AD-S52 and AD-S82 speakers?

    • A.

      Grill damage

    • B.

      Woofer failure

    • C.

      Overpowering

    • D.

      Baffle cracking

    Correct Answer
    C. Overpowering
    Explanation
    Overpowering is the most common failure mode in the AD-S52 and AD-S82 speakers. This means that the speakers are being subjected to a higher power input than they can handle, resulting in damage to the internal components. This can lead to distortion, blown speakers, or even complete failure of the system. It is important to ensure that the speakers are matched with an appropriate amplifier and that the power levels are properly controlled to prevent overpowering and potential damage.

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  • 18. 

    The transformer tap switch on the AD-S282H, AD-S282HT, I-282H, or I-282HT often break because why?

    • A.

      The customer is too aggressive with the switch.

    • B.

      Too much power flows through the switch.

    • C.

      The customer is running the amplifier at the wrong voltage setting.

    • D.

      The switch is not meant to be turned.

    Correct Answer
    A. The customer is too aggressive with the switch.
    Explanation
    The correct answer is that the customer is too aggressive with the switch. This means that the customer is using excessive force or handling the switch in a rough manner, causing it to break. This could include forcefully flipping the switch or mishandling it during operation.

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  • 19. 

    If the transformer tap switch on the AD-S282H, AD-S282HT, I-282H, or I-282HT is broken, should you replace the entire back plate "backpack" assembly instead of the switch itself?

    • A.

      Yes

    • B.

      No

    Correct Answer
    A. Yes
    Explanation
    If the transformer tap switch on the mentioned models is broken, it is recommended to replace the entire back plate "backpack" assembly instead of just the switch itself. This implies that the switch is not easily replaceable or detachable from the assembly.

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  • 20. 

    If an ACTIVE loudspeaker has "won't turn on, or shuts off intermittently", what should be done first before anything else?

    • A.

      Verify the customer's complaint.

    • B.

      Open the speaker enclosure.

    • C.

      Remove the amplifier module.

    • D.

      Remove the PCB module.

    Correct Answer
    A. Verify the customer's complaint.
    Explanation
    Before anything else, it is important to verify the customer's complaint when dealing with an active loudspeaker that won't turn on or shuts off intermittently. This step ensures that the technician understands the specific issue the customer is facing and can proceed with the appropriate troubleshooting and repair process. Without verifying the complaint, any further actions taken may not address the actual problem and could potentially waste time and resources.

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  • 21. 

    In the K, KW, or KLA series ACTIVE loudspeakers, what is the proper power-up sequence for the amplifier module?

    • A.

      Blue LED only.

    • B.

      Red LED, Green LED, then Blue LED

    • C.

      Red, Green, and Blue LED on at the same time, then the Red and Green LED off after 1 second.

    • D.

      Red LED and Blue LED on always.

    Correct Answer
    B. Red LED, Green LED, then Blue LED
    Explanation
    The proper power-up sequence for the amplifier module in the K, KW, or KLA series ACTIVE loudspeakers is to first turn on the Red LED, followed by the Green LED, and then the Blue LED.

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  • 22. 

    In the K, KW, or KLA series ACTIVE loudspeakers, if the LEDs do not light up in the proper sequence, what component might be the problem in the loudspeaker?

    • A.

      The drivers

    • B.

      The wiring harness

    • C.

      The amplifier module.

    • D.

      The LEDs themselves.

    Correct Answer
    C. The amplifier module.
    Explanation
    If the LEDs in the K, KW, or KLA series ACTIVE loudspeakers do not light up in the proper sequence, the problem might be with the amplifier module. The amplifier module is responsible for powering and controlling the LEDs in the loudspeaker. If there is an issue with the module, it can result in the LEDs not lighting up correctly.

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  • 23. 

    In the K, KW, or KLA series ACTIVE loudspeakers, if the LEDs light up in the proper sequnce, what should be done next?

    • A.

      Remove the amplifier and test the drivers.

    • B.

      Test the front LED

    • C.

      Remove the wiring harness from the amplifier module and then try again.

    • D.

      Apply an audio signal to the input and confirm sound output.

    Correct Answer
    D. Apply an audio signal to the input and confirm sound output.
    Explanation
    After the LEDs light up in the proper sequence in the K, KW, or KLA series ACTIVE loudspeakers, the next step should be to apply an audio signal to the input and confirm sound output. This will ensure that the speakers are functioning properly and producing sound as expected.

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  • 24. 

    Which components on the K series often break and cause the symptom of "intermittent or no power".

    • A.

      Bridge Rectifier

    • B.

      Surface mount capacitors

    • C.

      Inductors

    • D.

      Fuse

    Correct Answer
    C. Inductors
    Explanation
    Inductors are components on the K series that often break and cause the symptom of "intermittent or no power". Inductors are passive electronic components that store energy in a magnetic field. If an inductor breaks or malfunctions, it can disrupt the flow of current and result in intermittent or no power.

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  • 25. 

    What is a common issue with the HPR122i and HPR153i/F?

    • A.

      Intermittent or no power

    • B.

      Open HF (compression) driver.

    • C.

      Bad mid-frequency driver.

    • D.

      Dust cap falling off cone.

    Correct Answer
    B. Open HF (compression) driver.
    Explanation
    The common issue with the HPR122i and HPR153i/F is an open HF (compression) driver. This means that there is a problem with the high-frequency driver, which may result in a loss of sound or poor quality sound.

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  • 26. 

    If an HPR amplifier module is stuck in mute or protect (the red LIMIT led is on), which section should be checked first?

    • A.

      Amplifier section

    • B.

      The drivers should be checked

    • C.

      The input section

    • D.

      Muting section

    Correct Answer
    D. Muting section
    Explanation
    If an HPR amplifier module is stuck in mute or protect, the first section that should be checked is the muting section. The muting section is responsible for controlling the audio signal and ensuring that it is properly muted or protected. If this section is not functioning correctly, it can cause the amplifier module to be stuck in mute or protect mode, indicated by the red LIMIT led being on. Therefore, checking the muting section would be the logical first step in troubleshooting the issue.

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  • 27. 

    On a KW181 loudspeaker, if the amplifier will not turn on, what part should be checked for continuity?

    • A.

      Fuse F2

    • B.

      Main AC Fuse F1

    • C.

      The woofer

    • D.

      Check the crossover assembly, which obviously doesn't exist in this subwoofer.

    Correct Answer
    A. Fuse F2
    Explanation
    If the amplifier on a KW181 loudspeaker is not turning on, the part that should be checked for continuity is Fuse F2. A blown fuse can prevent the amplifier from functioning properly, so checking and replacing the fuse can potentially solve the issue.

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  • 28. 

    On a KW181 loudspeaker, if no sound is outputted from the driver, what might be the problem with the driver if it relates to service bulletin KWS0003?

    • A.

      Open voice coil

    • B.

      Shorted voice coil

    • C.

      Frozen driver

    • D.

      The amplifier is actually the problem.

    Correct Answer
    C. Frozen driver
    Explanation
    If no sound is outputted from the driver of a KW181 loudspeaker and it relates to service bulletin KWS0003, the problem might be a frozen driver. This means that the driver is not able to move freely due to mechanical issues or a build-up of debris, causing it to be stuck and unable to produce sound.

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  • 29. 

    If you need a part for a loudspeaker repair outside of the amplifier, what type of drawing should you look at for the part number?

    • A.

      Schematic

    • B.

      Exploded view

    • C.

      CAD Layout

    • D.

      Q-sys Designer Files

    Correct Answer
    B. Exploded view
    Explanation
    An exploded view drawing is used to show the individual components of a product and how they fit together. In the case of a loudspeaker repair, an exploded view drawing would be the most appropriate type of drawing to look at for the part number. This drawing would provide a clear visual representation of the different parts of the loudspeaker and their respective numbers, making it easier to identify and locate the specific part needed for the repair.

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  • 30. 

    If repairing a speaker in a WideLine array, which part should always be checked because of a safety hazard?

    • A.

      The knuckle

    • B.

      The drivers

    • C.

      The handles

    • D.

      The grill

    Correct Answer
    A. The knuckle
    Explanation
    When repairing a speaker in a WideLine array, the knuckle should always be checked because of a safety hazard. The knuckle is the joint that connects the different segments of the array, and if it is damaged or not properly secured, it can cause the array to collapse or fall, posing a risk to anyone nearby. Therefore, it is crucial to ensure the knuckle is in good condition and securely fastened to prevent any accidents or injuries.

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  • 31. 

    When repairing a KLA or Wideline systems, what practice should always be enforced?

    • A.

      All parts should be tightened to specified torque ratings.

    • B.

      Test the every speaker in the array.

    • C.

      Lubricate with ample amounts of KLA jelly.

    • D.

      Calibrate the angle of the array to a 1 kHz test tone.

    Correct Answer
    A. All parts should be tightened to specified torque ratings.
    Explanation
    When repairing a KLA or Wideline systems, it is important to always enforce the practice of tightening all parts to specified torque ratings. This ensures that the parts are securely fastened and will not come loose during operation, which could lead to malfunction or damage. By following this practice, technicians can ensure that the system is properly assembled and will function correctly.

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  • Current Version
  • Jun 24, 2024
    Quiz Edited by
    ProProfs Editorial Team
  • Aug 16, 2012
    Quiz Created by
    Patrick Heyn
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