Re: The sound on my sony amplifier sounds too low inside...
I had a similar problem with my STR-DB930 and I think it was solved by turning the speaker select knob on the front left hand side of the amp to "A" rather than "A+B". As I only have front speakers connected to the A terminals, not both A and B.
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are you sure you have connected a sound source to the inputs correctly and turned on the sound source so it is playing into the sony?
If you have use the sony controls to turn up the volume and then select each input source one by one, do you then hear it?
The protection only should come on, when the power amplifier has to give more current than it can deliver. (electronic fuse) If in the music is a lot of subsonic, sound, so low you can't hear and your speakers can't produce, this could cause the problem. Normal CD players will cut of all frequencies beneath 20 Hz, but it could be your PC is giving everything from 1 Hz and above. I would certainly try to play some music over a CD player and check if that would solve your problem. Not sure if that works, what you could do to suppress the sub sonic in the computer music.
Use an amplifier with NO MORE than 150 Watts per channel or you be buying new speakers. At this power level don't expect booming bass boost without damaging the speakers. The Rotel generates 130 per side which is very near the safe maximum for those speakers... and the specs look good. If you are not satified with the sound, the speakers are LIKELY the problem. Look at getting good commercial speaakers instead of CONSUMER grade speakers. Go to a music store dealing with bands and musicians and view the products they have to offer. Consumer speakers often fail when people turn up too much bass. At high listening levels hearing damage can result.
when you amplifier is powered on if the speakers are powered on and you hear that the output is switch on then it is possible that the fault of the amplifier is in the preamplifier.Open the set and check on the input of the amplifier with a signal . If there is output the fact is confirmed of the preamp stage. Now we have to confirm if the fault is in the source swtiching or the preamp equaliser/ tone section. Using a good signal tester and hoping that you are familiar to handle the electronics inside, the IC can be identified and changed. Use extreme care and test at low output, Use a help of an expert to signal trace the fault. Hope I could help. Good day
If you can hear music with the volume up, but like it was turned down low (from the power amp), then yes there is something up with it. If it's the same on both left & right channels, then it's something common to both. For instance the power supply, or an IC that has both channels going in it.
If however the power amp does produce sound normally with another device, then either the turntable has a fault, or the pre-amp has, perhaps on the pre-amp inside it for the cartridge.
If you can't hear any sound from the headphone output, and by sound I mean a hum with the volume turned up, then the amp has either got a faulty internal power supply or the main amp has failed. Try looking inside to see if any fuse has blown. Also look around to see if you can see or smell anything has blown.
If you switch on the amplifier, do you hear nothing at all?
Or do you hear low level noise or hum out of the speaker? Don't know if you're technician.
If the tubes are glowing, you can measure the high voltage.
Check also fuse 3 and 4, thats the neg. voltage -27V and -14V.
When the amplifier will turn on but not produce any sound that is usually an indication of either the high voltage power supply inside the amplifier is not working, or the amplifier IC or amplifier circuit is damaged. It is not something that can be repaired unless you have experience working on electronics.