Its for digital decoding of the sound source. You need to connect a digital cable (ie optical) from the DVD player to the optical input in the receiver. The receiver should then decode the source into multichannel components ie 5 channels for example
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Unfortunately this is not a fuse problem, as the fuse would burn before the protector check code appears. Probably there is a short circuit and you should take to an authorized sony repair shop. Good Luck.
Make sure that you have a connection from video out to the TV, from the input you are using for the PS3 on the receiver. The connection for video to the TV is labeled "monitor out" on the receiver. You can use one of the following for it; composite, component or S-video. Or...
Your best results however for your hardware, is to connect your PS3 directly to the TV, then connect the "audio out" from the TV to the receiver. Then select on the receiver the matching input you connected the audio to from the TV.
If you put the speakers in parallel, the amp may well blow (4 ohm speakers in parallel would kill it at high volumes), and it may take the speakers with it.
I wouldn't try to extract more than the rated power from the amp. At it's rated output, it's seriously distorting, to a point where it becomes unlistenable. So, trying to ramp up the power further would only make it sound worse.
Putting the speakers in series is a safer route for your amp.
Doument Reference: E23914196 Subject/Description: "Protect 21" is displayed when connecting to speaker/powered subwoofer combo
SYMPTOMS Protect 21 is displayed when
connecting to speaker/powered subwoofer combination model such as the
SA-VA7000ED. The problem was also found to occur when connected to the
Definitive Technology POWER MONITOR 500 and POWER MONITOR 700 series
speakers. CAUSE The DC detection circuit is triggered when the speakers are connected.
Add a 4.7k metal oxide film resistor across capacitors C1319 and C1329 located on the D-AMP board.
error code 11 (protector) - According to the manual, 11/PROTECTOR means, "Irregular current is output from the speakers. Turn of the receiver, check the speaker connection and turn on the power again."Most likely, a strand of speaker wire is shorted to the chassis at one of the speaker terminals.
Hope this helps !
The display "PROTECT" and the auto-shutdown is indicative that the Sony STR-DA5000ES senses an internal fault and powers off automatically to prevent further damage. The fault may either be in the amplifier section, the power supply section and/or the logic board (mini computer).
Initially, try a full hard reset, that is unplug from the mains for a couple of hours to hopefully revert the unit back to factory default (that is assuming no hardware problem). Additionally, you may want to check the speaker and the speaker wires for any open/breaks or short.
If above steps are not corrective, you may need to seek the services of a qualified professional or a service center since this would require on-site/in-shop repair, knowledge of electronic circuitry and components, a full service manual or at the very least a schematic diagram with voltage readings, a DVM and a soldering iron.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.