Speakers & soundbars

Receiver shuts off or shows a protection error after connecting speakers

This usually means bare speaker wire strands are touching and shorting the positive and negative connections, which the receiver's protection circuit detects and shuts down to prevent damage. Checking for touching wire strands fixes most cases.

Difficulty
Moderate
Time
20–40 minutes
DIY cost
$0–$20
Pro cost
$80–$200

Symptoms

  • Receiver turns off immediately or soon after powering on with speakers connected
  • Protection or error light appears on the receiver display
  • Receiver works fine with speakers disconnected
  • Issue appeared right after connecting or moving speaker wires

Likely causes

  • CommonBare speaker wire strands touching between positive and negative terminalsFrayed wire ends can easily bridge the two terminals, creating a short circuit.
  • CommonSpeaker wire pinched or exposed against a metal surfaceWire run behind furniture or through tight spaces can have its insulation damaged, causing an intermittent short.
  • PossibleSpeaker impedance too low for the receiverConnecting speakers rated below the receiver's minimum supported impedance can trigger protection mode.
  • PossibleDamaged speaker with an internally shorted voice coilA speaker with internal damage can short the amplifier output even with good external wiring.
  • Less commonFailing internal amplifier componentAn amplifier fault unrelated to external wiring can also trigger protection mode.

What to do

  1. Disconnect all speaker wires from the receiver and power it on with no speakers connected to confirm the receiver itself powers on fine.
  2. Inspect each speaker wire's exposed end for stray strands that could touch the opposite terminal, and trim/twist them neatly.
  3. Reconnect one speaker at a time, powering on between each, to identify which speaker or wire run triggers the shutdown.
  4. Check the full length of accessible speaker wire for pinch points, especially where it passes under furniture or through walls.
  5. Verify your speakers' impedance rating matches what the receiver's manual specifies as safe.
  6. If a specific speaker consistently triggers the protection mode even with a known-good wire, that speaker likely has an internal short.

Tools and parts

  • Wire strippers
  • Electrical tape
Speaker wireSearch: “speaker wire replacement”

When to call a pro

If a specific speaker triggers protection mode with confirmed good wiring, or if the receiver still shuts down with no speakers connected, professional repair is needed.

Safety

Use caution

Always power off and unplug the receiver before handling speaker wire connections to avoid shock or further damage.

Related guides

Operator provides AI-generated troubleshooting information. It can be wrong. For safety-critical, electrical, gas, structural, medical, automotive safety, or other high-risk problems, consult a qualified professional.