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GRAF & MEYER eXentro PA-8250 - User Manual

GRAF & MEYER eXentro PA-8250
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eXentro PA-8250 / PA-8125 power amplifier
Safety and Installation Guideline
Sicherheitsrichtlinien und Installationsanleitung
Guide d’installation et de sécurité
Retningslinjer for sikkerhed og installation
Guía de seguridad e instalación
Linee guida per la sicurezza e l'installazione
Veiligheids- en installatiehandleiding
Riktlinjer för säkerhet och installation
Wytyczne dotyczące bezpieczeństwa i instalacji

Table of Contents

Questions and Answers

  • J
    James JacobsAug 9, 2025
    How to troubleshoot GRAF & MEYER eXentro PA-8250 with no sound and no power?
    • M
      Michael DixonAug 9, 2025
      If your GRAF & MEYER Amplifier has no sound and no power, it usually indicates a power supply issue, either with the power line or the amplifier’s power supply. First, try turning the amplifier off and on again. Also, ensure the AC power cord and 48 V input are properly connected. Check for a secure fit between the plug and AC receptacle, and try other receptacles. Verify the power at the AC receptacle and check the DC battery voltage. A blown amplifier fuse could also be the cause, so replace the fuse if necessary. Lastly, the amplifier may be in protection mode, so allow it to cool down.
  • S
    Sandra RodriguezAug 14, 2025
    What to do if GRAF & MEYER eXentro PA-8250 has power but low or no output?
    • R
      Robin HarringtonAug 14, 2025
      If your GRAF & MEYER Amplifier powers on but has low or no output, the problem is usually related to the signal source, a bad cable, or a partial output short circuit. First, check and reset the input level controls at the source, pre-amp, or gain control, as they may be set too low. To determine if the problem is at the source, move the input connections to another amplifier that you know is working. Also, make sure there are no small strands of wire touching similar strands from the other wire in the cable, and ensure the speakers are functioning correctly. If operating in bridged mode, verify the Mode Switch is set correctly. Finally, use a voltmeter to check if the power line voltage is dropping excessively when the amplifier is driven hard.
  • M
    Meghan WoodAug 19, 2025
    Why does GRAF & MEYER eXentro PA-8250 have playback mixed with hum?
    • J
      Jessica WestAug 19, 2025
      If your GRAF & MEYER Amplifier's playback is mixed with hum, check or replace the connecting cables. Ensure each screw terminal connection is tight. The signal cables may be routed too closely to AC cables, power transformers, motors, or other EMI-inducing devices. Connect another source to the power amplifier inputs; if the hum stops, the problem lies with the original source component. Make sure no ground loops are created between connections of different devices in the system.
  • R
    richardlaneAug 25, 2025
    What causes GRAF & MEYER eXentro PA-8250 Amplifier to enter protection mode?
    • S
      Scott Maldonado PhDAug 25, 2025
      If your GRAF & MEYER Amplifier is in protection mode, it means that an amplifier channel or PSU went into protection mode due to activated protection circuitry. Ensure the connected speaker lines are not creating a short circuit; if so, remove the short circuit. The amplifier channels or PSU may have overheated; wait a few minutes to let them cool down, and they will re-enter operating state when the temperature is reduced. Also, make sure the input voltages are not exceeding the maximum specifications.
  • T
    Taylor FordAug 29, 2025
    What causes distortion in GRAF & MEYER eXentro PA-8250?
    • B
      Bruce GutierrezAug 29, 2025
      Distortion in your GRAF & MEYER Amplifier is usually caused by excessive loss in the input controls when the mixer, equalizer, or crossover does not produce enough output. Check and reset the input level controls, ensuring they are not set too high. Also, check speaker connections and verify that all screw connections are tight and that there are no stray strands of wire to cause short circuits. Verify that the total load impedance presented to the amplifier is within the limits described in this manual.
  • T
    taylorluisSep 3, 2025
    How to fix unnatural sound in GRAF & MEYER Amplifier?
    • J
      jennifer97Sep 3, 2025
      To address unnatural sound from your GRAF & MEYER Amplifier, check the EQ cards. Verify that the EQ card corresponds to the model speaker being used and that the EQ card is installed in the proper channel socket. Also, verify that the speakers are connected to the same channel that the corresponding EQ card is installed in.

GRAF & MEYER eXentro PA-8250 Specifications

General IconGeneral
Output Power (4 ohms)2 x 250 W
Output Power (8 ohms)2 x 150 W
Frequency Response20 Hz - 20 kHz
Damping Factor>200
Signal-to-Noise Ratio100 dB
Input Impedance20 kOhms
THD0.05%