Would this work?

The photo of the solder side of the pcb has changed.
1) The amplifier has outputs that have DC on them. The DC will fry the speakers all the time, even when not playing sounds and will pull the cones of the speakers over to one side which produces severe distortion. When the amplifier outputs are bridged then they each have the same DC voltage then the speaker gets no DC.
2) When the input is mono then the output is also mono, not stereo.
3) The bridged amplifiers circuit has something that inverts the signal on one channel. Then when you play the two speakers through large coupling capacitors to block the DC, the bass will cancel and the sound will sound tinny.

 

The photo of the solder side of the pcb has changed.
1) The amplifier has outputs that have DC on them. The DC will fry the speakers all the time, even when not playing sounds and will pull the cones of the speakers over to one side which produces severe distortion. When the amplifier outputs are bridged then they each have the same DC voltage then the speaker gets no DC.
2) When the input is mono then the output is also mono, not stereo.
3) The bridged amplifiers circuit has something that inverts the signal on one channel. Then when you play the two speakers through large coupling capacitors to block the DC, the bass will cancel and the sound will sound tinny.

You're right i was going to ask the question that aux jack got a L and R output so how on earth combining them and putting in the amplifier using just a single wire can make it a stereo.
Here is another question, would it be okay if i make another identical amplifier circuit? But in that case there would be there aux wire coming out 1. L channel, 2. Right, 3. GND...in that case how would i connect them to my potentiometer circuit?
And would it be ideal for two boxes like these (each speakers are of 8ohm, circuit shown for one box)?

 

That AUX jack has a L and R output so how on earth combining them and putting in the amplifier using just a single wire can make it a stereo.

No. The AUX jack is an amplifier input, not output. It has the black wire for a mono input and the red wire is its ground. It is not stereo.

Here is another question, would it be okay if i make another identical amplifier circuit?

The circuit board with that No-Name-Brand amplifier IC is shown on a video from India on You tube.
Some place in India might have that circuit board or IC. You can replace the volume and tone controls with stereo potentiometers.

 

No. The AUX jack is an amplifier input, not output. It has the black wire for a mono input and the red wire is its ground. It is not stereo.


The circuit board with that No-Name-Brand amplifier IC is shown on a video from India on You tube.
Some place in India might have that circuit board or IC. You can replace the volume and tone controls with stereo potentiometer

No. The AUX jack is an amplifier input, not output. It has the black wire for a mono input and the red wire is its ground. It is not stereo.

Sorry for misunderstanding, i was trying to say 3.5 mm headphone Jack, which got one left channel one right one ground and a mic. As I'm gonna play songs from smartphone to speaker, my phone will send dual channels to the amplifier right?


The circuit board with that No-Name-Brand amplifier IC is shown on a video from India on You tube.
Some place in India might have that circuit board or IC. You can replace the volume and tone controls with stereo potentiometers.

 

Your phone produces stereo outputs but your amplifier is a mono amplifier with a single mono input and output.

 

Want to try?
https://easyeda.com/bhartiaman/cd6283-stereo-amplifier-circuit