Speakers & Picture Distortion

How can I detect picture distortion when placing non-magnetically shielded speakers
(BW DM-303) close to TV ? Technically what is the minimum distance I should place speakers from TV in order not to get distorted ? Thanks

The minimum distance is when the distortion stops. Seriously. There is no 'magic number' as there are too many factors.

It all depends on the strength of the magnets inside the cabinet, etc. A fairly safe estimate is at least 12 - 18 inches away from the screen.

You will see the tv picture distort if speakers are to close to tv. You may see graininess in the picture, color smears, distorted picture.