Voice is not coming out from my right stereo speaker and my left speaker stop working some times ..what did i do SIR.

This is because the G Track's Mic signal is on the Left channel and the Instrument signal is on the Right channel. You are making a stereo recording when you should be making 2 mono recordings. Does Nicecast have an option to set the track to mono Left channel? Traktor should, but I haven't used it so I can't tell you where the option is. There's probably a Track Input drop-down or something like that.

You don't say what source(s) are affected. I'm guessing TV or Cable-TV is the problem because music with vocals has voices and you say it sounds ok. Your speakers have no clue whether a sound is a voice or music so that lets THEM out and your receiver doesn't know or care either.

In the modern multichannel world it's usually assumed your electronics are multichannel. This receiver is old-school stereo.

The Center channel is usually where voices are found but some systems (like yours) don't have a Center speaker so they have to be configured to share the Center duty with the front left and Right speakers.This isn't possible or even normally necessary in your case. WYSIWYG

http://www.retrevo.com/support/Onkyo-TX-8222-Receivers-manual/id/469ci869/t/2/

The audio coming in from 'wherever' should be correctly mixed to 2-channels at the source or you'll probably be missing something. I'd look higher up the audio food chain for where the voices are being attentuated. If a cable box is involved I'd look at its audio settings regarding stereo mix-down

Wait, I just had an inspiring thought. Centered voices being mono in nature would partially cancel out if your two speakers were out of 'phase' with each other. Bass would also suffer. Make sure your two speakers are wired identically regarding the red and black (or plus and minus) conductors. If turning the Balance control fully to one side makes bass of voices sound louder you probably have a phase mismatch. Reverse the wiring on either speaker to match the other. There is no absolute right or wrong for phasing as long as they're all the same.

Right here!
1986 Ford Ranger Car Radio Wiring Chart
Car Radio Battery Constant 12v+ Wire: Green/Yellow
Car Radio Accessory Switched 12v+ Wire: Yellow/Black
Car Radio Ground Wire: Chassis
Car Radio Illumination Wire: Blue/Red
Car Stereo Dimmer Wire: N/A
Car Stereo Antenna Trigger Wire: N/A
Car Stereo Amp Trigger Wire: N/A
Car Stereo Amplifier Location: N/A
Car Audio Front Speakers Size: 4′
Car Audio Front Speakers Location: Dash
Left Front Speaker Positive Wire (+): Orange/Green
Left Front Speaker Negative Wire (-): Black/White
Right Front Speaker Positive Wire (+): White/Green
Right Front Speaker Negative Wire (-): Black/White
Car Audio Rear Speakers Size: 5′ x 7′
Car Audio Rear Speakers Location: Rear Corners
Left Rear Speaker Positive Wire (+): Pink/Green
Left Rear Speaker Negative Wire (-): Pink/Blue
Right Rear Speaker Positive Wire (+): Pink/Blue
Right Rear Speaker Negative Wire (-): Green/Orange

I took my time to find this for u please show your thanks with a "FIXYA" rating.

2009 Ford Ranger Car Stereo Installation Guide
Car Radio Battery Constant 12v+ Wire: Violet/Red
Car Radio Accessory Switched 12v+ Wire: White/Red
Car Radio Ground Wire: Black/Yellow
Car Radio Illumination Wire: Blue/White
Car Stereo Dimmer Wire: Green/Red
Car Stereo Antenna Trigger Wire: N/A
Car Stereo Amp Trigger Wire: N/A
Car Stereo Amplifier Location: N/A
Car Audio Front Speakers Size: N/A
Car Audio Front Speakers Location: N/A
Left Front Speaker Positive Wire (+): White
Left Front Speaker Negative Wire (-): White/Brown
Right Front Speaker Positive Wire (+): White/Violet
Right Front Speaker Negative Wire (-): White/Orange
Car Audio Rear Speakers Size: N/A
Car Audio Rear Speakers Location: N/A
Left Rear Speaker Positive Wire (+): White/Orange
Left Rear Speaker Negative Wire (-): Brown/Yellow
Right Rear Speaker Positive Wire (+): Brown/White
Right Rear Speaker Negative Wire (-): Brown/Blue

I have the same issue if I connect my digial audio cable from the Yamaha receiver directly to the HDTV. But, I get all 6 speakers working when I connect the Yamaha receiver directly to the Comcast HD box (instead of TV).

Dual Voice-Coil
The unique Dual Voice-Coil design allows both left and right channel sound from just one speaker. Simply hook up both the left and the right channels to the special terminals on the speaker. Hook up one channel only, if the speaker is to be used in a conventional stereo set-up.
I found this on jamo site hope that will help you

first check the settings on the audio menu of the dvd player. make sur it is set to 5.1 (if available) otherwise set it to stereo and your system should decode it.
assuming the second step is okay : as other dvd you play seem to work) it still may be that your unit is decoding stereo inputs just fine and 5.1 is not working properly....
so if adjusting audio settings in dvd play back menu dont work,
check that the cables to the satellite speakers are connected correctly and all plugged in soundly ( voice is high frequency,- coming from satellites - the garbled noises you hear are the base ( low freq) elements of voice which are coming from the bass box ( that the X.1 part of 5.1) and so that is obviously working. ,

This is a 5.1 (6 Channel Technology) You should hear only the voice thro the center speaker. If the source you are playing is stereo, however the software splits the source its difficult to seprate the voice track, if the source is a DTS 5.1, then you should hear the voice only thro the center speaker. eg: when you play a DVD movie which is DTS 5.1 then you should hear only the voice track in the center speaker, if the dvd movie is just stereo then you will not hear any audio in the center speaker, while the other four speakers get output, this is the special effect in 5.1 ( 6 channel Output).