DIY Speaker building: How to magnetically shield?

[d33pt]

Ok you guys, i know there are a few DIY speaker builders here. What do you use to shield your subs and speakers magnetically from your TV, or do you? I made a nice sub, and it's about 5 ft away from my tv, but i still get magnetic discoloration. moving it farther is not really an option because my apt is small. anything i can coat the inside of the box to cut down on this? how do the pros do this? do they just coat the magnet with something?

 

[Kelvrick]

try coating the inside of the box with aluminum foil.

 

[Hayabusa Rider]

You need to use a magnetic metal. Aluminum etc is transparent to magnetic fields and therefore useless unlike plain old sheet metal

 

[d33pt]

so i should just coat the inside of the box with sheetmetal? or should i try to build an enclosure around the magnet? i think part of the magnetism comes straight out the front of the woofer too, so i'm not sure what to do about that...

 

[Hayabusa Rider]

Hmm... I am no acoustical engineer, and my concern would be changing the acoustics of the enclosure. Still, shielding the interior at least on the side(s) between the magnet and TV is easy and worth a try.

 

[pdo]

you would need to get a bucking magnet.

 

[d33pt]

would this affect the acoustic properties of the sub in any way?