Hiss hight pich in the right

Some hiss at high gain settings is normal. If you get objectionable hiss at 1 o'clock settings of gain, that is too high. Electronics has noise that is "statistical" in nature due to physics that we can't get around in design. Most hiss is created in the preamp area and swapping tubes in the first stage might help. By varying the volume controls and observing the level of the hiss, we may be able to analyze the offending staage of amplification. ALso turning up the treble controls will increase the hiss, as it is mostly in the higher pitches.

All interconnected equipment MUST be powered from the same receptacle or source. The XLR to the speakers should NOT have ground lift. The power for the mixer should come from where the speakers are and be routed alongside the XLR cables. All the other connected items should also be powered by the same source. The ground bounce within a building cannot only cause noise, but can rupture the input circuits of equipment. As an electrical engineer I don't know why manuals supplied with the equipment doesn't go into this more. The professionals at the big venues all know this as they have had to pay to get equipment repaired.

Now to get down to "hiss" once you get the other stuff straightened out, there are two things to know at the start: The first is that due to the statistical nature in electronics "noise and hiss" are among the laws of physics that we can't completely get around. The level of the hiss should NOT be objectionable however. The second thing is that proper level setup is important to minimize the effects of noise and hiss. You should be sending the levels to the powered speakers at near full line level into the line inouts, never mic inputs that some have. Using excess gain at the speakers will amplify any noise pickup on your audio lines. Next, at the mixer, try to keep all the level controls around 10 to 2 0'clock for rotaries and 70% for faders. Excess gain at certain stages will cause hiss to be objectionable.

If you are having the treble/high turned up there will be hiss. This is due to the statistical noise in electronics, including semiconductors. It is a matter of degree. The hiss should be 30 Db below your program level or so.

It is very common for one to change settings and suddenly start to notice hiss or hum at certain settings.

IF YOU CAN, go to a music store and COMPARE the amp to yours at the same setting with NOTHING plugged in. (cables and guitars can generate hiss or other noise themselves).

There is very little in your amp that would have changed to suddenly start generating hiss, so FIRST compare. This will minimize the chance of spending money at a shop to be told it is normal.

Make sure the master volume is turned up and the inout gain is down some.

All of the electronic devices suffer from the statistical noise within the amplifying components. Keeping the inour gain down some tends to limit the gain where the hiss is most sensitive, that is the high gain in the "front end" or preamp section.

A "ton" is not a MEANINGFUL measure of the loudness of the hiss.

A meaningful measurement would be the Db relative to the normal program material.

Test with no devices plugged into it as the preamps in guitars can create hiss too. The hiss should be barely perceptable at 5 feet from the amp.

Look for cracked and gummy vacuum hoses. It's time to see if any are in this condition or disconnected entirely.

If trim controls or gains are set near maximum, HISS is normal as electronics generates a thermal type noise.

If gains are set in normal operating area, the noise SHOULD be minimal.

Other sources of interference like nearby radio transmitters, welders, arc lights, etc. can create noise.

Start with ALL gains turned down and find which if any cause the noise to be unacceptable.

MAKE SURE all power to this and ALL the other connected equipment come from a single receptacle to avoid ground loops.

A certain amount of "hiss" is present in electronic amps due to the statistical noise in electronics.

The hiss should be WELL below the level you get when playing. If you put you ear to the speaker, expect to hear some hiss with nothing plugged in. Ten feet away it should be very faint.

Ur hight voltage Flyback transformer it dead.
U need a new one.

if I turn it off, it will change chanel and if I press volume,it will turn it off. please help me.

Do you mean audio hissing sound or is there smoke coming out the back?

In what sources does the hiss occur?

Audio hiss with the FM tuner selected would mean it's between stations or you don't have an antenna. Try tuning around the band with an antenna attached.