Question about Harman Kardon AVR 310 Receiver

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My redceiver gives me a message saying "protect" when i turn the volume up. this started after i hooked up a subwoofer, why is this happening?

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You should consult the manuals for the receiver and the subwoofer to make sure you haven't connected the sub improperly. If the amp was working normally before you connected the sub, I would look at the sub hookup first. If the sub is a passive type, and you have connected it in parallel with your main speakers, the amp may not be able to handle the extra load. You may have to get another amp to drive the passive sub. If you have an active sub, you may not be using the right input/output connections between the amp and the sub inputs. Or, you may have hooked the sub up in a way that causes the amp to become unstable. Check the manuals. If you can't resolve it, come mback here with a lot more detail about your gear.

Posted on Oct 07, 2010

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1 Answer

Subwoofer ain't doing anything on peavey triflex


Could be a few issues. If it is powered up when you plug it in, it might have a short circuit protection that shuts it down, or a thermal overload that is over sensitive. It might also be an issue with the cable you are using to connect it, from a broken wire to one that has a plug just slightly too long- there are 5 different tip lengths.

This also assumes the input itself is not being over driven, and that the output is not shorting out either..

Jun 10, 2012 | Music

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My stereo sysytem is a mini stereo: serial number 10200055. It currently says "protect", what is this and how do we return our system to normal operations?


Hi there,

When the word PROTECT appears on this display, this means the unit has detected a critical fault which could potentially cause harm to your stereo system.

The most common cause is a short circuit somewhere - something even as simple as loose speaker wiring could cause a short, triggering the Protect message.

You will need to determine if there is a possible short somewhere, so I recommend you start by firstly turning power OFF, disconnecting all speaker wires, then turn unit back ON.

Operate the stereo (without speakers) and turn volume up:
  • If Protect message appears when turning volume up, then stereo unit itself has an internal fault
  • If no Protect message appears, then suspect the speakers may be causing the issue.
  • Reduce volume and turn unit OFF
Re-connect speakers (ensure the connections are secure), turn unit ON:
  • If turning volume up triggers the Protect message again, there is an issue with the speakers or connections

Hope this helps.....

Sep 04, 2011 | Kenwood Audio Players & Recorders

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My receiver gives me a PROTECT message when i turn the volume up to high and it shuts itself off what does this mean? this started after i hooked up a subwoofer


There is likely a problem in the power amp section that only becomes apparent when the increased volume demands sufficient current in that stage to push the amp into a potential component failure situation. The protect circuit clicks in and disconnects the speakers from the amp to protect them from damage should the power amp stage experience a catastrophic failure. Unless you are a trained technician, you should have the unit repaired before major damage occurs.

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Turn down the volume or power settings on it since its pulling too much power and shutting off for a few sconds to keep from blowing. Depending on the amp and speakers your using dont bridge the channels. If it won't come out of protect mode then unhook everything and just hook power, ground, and remote and wee what happens. If it comes on again and stays on then amp is blown.

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Speaker system


This definately means that you have a positve and negative speaker wire touching somewhere. First thing to do would be to check all connections at the speakers and on back of receiver and make sure all wires are seperated. This is a common problem if two wires are touching each other. If you check all connections and they look ok and you still have same problem you need to start unhooking all wires and hook them up one at a time and turn on system. If it works with one speaker then try hooking up a second speaker wire and so on until it gives you protection message again. Basically process of elemenation. Once you says that protection message you need to replace the last wire you hook up all together as you could of damaged it when running speaker wire or it could be a defect in speaker wire.

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