I am settling on some Sierra-1's and the ordering gives you the option of adding magnetic shielding for an additional $40. Although I don't have any CRT display etc, are there
any other situations where having the shielding would be needed? For example it seems
like it is worth adding this on, for any future issues (e.g., setting a wallet with
magnetic strip credit cards on top, etc). And it would be better to do it now rather
than be sorry later.

Also, I assume the shielding is a metal cover of some
sort or another than covers the (mainly) woofer magnet. Does any one know if this
affects the audio quality in any way? Thank you. Joe