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Check your remote control to see if the buttons are working properly. Or go into your unit's settings and check what the volume default is set to - It might be set to prevent it from going lower or higher.
Possible that the speakers are faulty or the circuit in the mother board is faulty.
Try and lower the volume level and see if the speakers work without failing , if so the speakers can be faulty.
Also try with a headphone , if there is no fault with higher volume then the circuit seems faulty.
This problem is usually dur to some corrosion in the speaker relay. If the relay can be opened, burnish the contacts and you should be OK. The higher volume creates a higher voltage that can "jump the gap" so to speak. Once the connection is made it will remain. That is why lowering the volume will work.
The receiver may be too under powered for your speakers or the speaker ohm's may not be matched for your amp.
The reason it is shutting off is likely because the amp is becoming overloaded. At lower volumes the amp can handle the load of the speakers, but at higher volumes the power supply of the amp can't keep up with the power demand the speakers are pulling.
If you were previously able to turn the reciever high without turning off, then there is likley something wrong with the amp or possibly a blown speaker.
Try measuring the resistance of the speakers if you have access to a multimeter. They should normally read 8 ohms for home speakers, but some common home speaker impedances in order from (I'm assuming) most common to least common are are 8, 4, 2(bose), and sometimes 10 or 12 ohms. The lower the number of ohms, the more power the amp will need to put to the speakers and the more chance you could be overloading your amp.
Right-click on the speaker icon in the lower right of your screen and choose Open Volume Control and check all volume levels (make sure they are not set to high). If this doesnt work then when you right-click, choose Adjust Audio Properties and search around for volume controls (maybe try the Speaker Volume button).
Anyway, I am not very familar with the Pioneer GUI auto setup. But, am aware of how AVR are set-up.
If you have set up the home theatre by auto/manual setup then please check the channel levels whether any of your channels settings is at +7.0db.
If so, reduce this setting where it more +7.0, then you would be able to raise the overall main setting from the volume control to go higher than -7db.( by as much as you've lowered the particular channel setting)
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● You cannot access the setup menu when the
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appears. Move to an unblocked channel
before you hit [MENU].
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automatically. The lower ratings will be
available for viewing.
● When you set the lowest rating to [VIEW],
all other ratings will automatically be available
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