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Because you've done something with the speaker connections that's too low impedance for the amp.
Amps need a certain level of resistance from the speakers otherwise there's a risk of the amp blowing itself up. Impedance is the name for resistance that varies with audio frequency. If the speakers you connected are any good, then there'll be label on the back telling you their impedance in Ohms.
When running a single set of speakers only then the amp would prefer an 8 Ohm load but it will accept a 4 Ohm load. If you plan to run speakers in both the A and B sockets, then both sets of speakers have to be 8 Ohms and no less. It also tells you this on the printing directly above the speaker sockets on the amp.
The amp is trying to protect itself from an overload situation where it would blow its output transistors and possibly kill your speakers too.
You can change the speaker impedance in advanced menu. With receiver in standby, press the MAIN ZONE button on front panel while holding down the STRAIGHT button. You should now see ADVANCED SETUP on the display. Use "PROGRAM < >" buttons to navigate to "SP IMP." screen. Then use STRAIGHT button to change the impedance. Finish by turning the receiver off by pressing MAIN ZONE button.
Hello, Go to the bottom right hand corner and click on the speaker there and adjust the volume or go to control panel and then sound and also adjust or download new drivers.
The Low Impedance setting is for when you have even one speaker with <8-ohms nominal impedance so you can use bot speaker pairs together. You still need to have an effective total (parallel) impedance of 4-ohms minimum or there may be problems like blowing up the amps.
Press and hold the SPEAKERS A or B button until LOW IMP lights or goes out, as required.
Press either button to toggle that speaker pair on or off.
Low Impedance is not a suggestion, it is a WARNING. Your receiver is telling you it senses TOO LOW a load and it's trying to protect itself from damage.
Speakers A& B are running in parallel, so their combined impedance, X, is found by using the formula: 1/X = 1/A + 1/B.
In other words, two 8-ohm speakers in parallel would yield a 4-ohm load.
If your speakers are identical, try running them in series on one speaker output pair. That would keep the impedance safely high.
Try checking your speaker impedance. If you have 6 ohm or 8 ohm speakers make sure the impedence matches. On the front panel hold down button that says "straight effect" while pressing Stanby/On button, it will default to SP IMP 8 min, press straight effect again, if you have 6 ohm speakers, then press Standby again to exit setting. Also, double check your speaker wires to make sure they are all connected, and none are loose.
This is similar to protect mode in that the amp has detected a short in the output and has shutdown to prevent damage. Without seeing the unit, I'm a bit hesatant to suggest repair tips. At this point, I would suggest you get a detailed estimate from a local shop. We should be able to guide you through the actual repair once the results are posted here.
If you have bare wire going into the receiver's output terminals, make sure a strand or two of wire is not touching the other terminal. That can short out the outputs, especially when you turn up the volume, which increases the voltage present at those terminals. That would cause the receiver to shut down as a saftey precaution.
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