speaker's humm sound

[Sagar_bh]

hey i'm having 2 speakers
1-ceiling speakers set of 4 connected to amp.
and a 2.1 intex computer speakers
when i play both of them individually it works fine.
but when i connect both aux in common and play it!
it starts giving loud buzz noise

 

[americanaudiophile]

Sounds like you are getting a ground loop.
http/web.mit.edu/~jhawk/tmp/p/EST016_Ground_Loops_handout.pdf
This is caused by the amp and powered speakers being connect to each other twice. Once by the common audio ground and once by the common AC ground.
You can use a 3 to 2 prong AC adapter to break the AC ground connection or an audio ground isolator
https/www.amazon.com/PAC-Ground-Isolator-3-5-Applications/dp/B001EAQTRI/ref=pd_bxgy_e_img_y
to break the audio ground connection.
It is also possible if you have cable TV that the RF input of the cable box is causing the noise (even if you are not using the cable box). If you disconnect the coax input to the box and the noise goes away then you can get one of these.
https/www.amazon.com/Viewsonics-VSIS-EU-Cable-Ground-Isolator/dp/B0017I3K9M