Thank you all for your invaluable responses!
I was quite surprised by the number of posts!
I guess... the most cost effective way is to start with changing a tube then and check surroundings. My floor is carpet though. Maybe the window right next to my speaker is troublesome.
I sent back the BK m-200 to manufacturer (San Francisco to New York is quite expensive). I thought this was the easiest way to fix it.
Thank you all! I will post the update later!
I was quite surprised by the number of posts!
I guess... the most cost effective way is to start with changing a tube then and check surroundings. My floor is carpet though. Maybe the window right next to my speaker is troublesome.
I sent back the BK m-200 to manufacturer (San Francisco to New York is quite expensive). I thought this was the easiest way to fix it.
Thank you all! I will post the update later!