childproofing rear speakers

My brother had the ultimate cure: He bought wall mount martin logans with metal grilles and in wall wiring. I'm still waiting for his kids to put pencils through the grill holes...

Kids will harm more than you think. They pull off grills, claw at the grills, push in dust caps on drivers...Imagine anything a 20 pound cat can do to your speakers!

Ikea has the right idea: Their anti-topple device is a simple strap screwed to the back of a unit and screwed to the wall. If no back wall, you will have issues. I would never leave speakers on stands around kids 8 months to 2 years old.

Which do you cry more about, the damaged speaker or the kids who got nailed by the falling speaker? Darn kids...

1-I would put something on top of the radiator or under the speaker to block the heat if you are that close. Veneer will delaminate over time.
2-Velcro is a great invention. It may discolor a patch either on the rear or underneath the speaker but should be sufficient in strenth to hold a small strap. You may even be able to put it where the speaker terminals are. However, you could even tie to the speaker terminals? They are usually quite well mounted and shouldn't have any problems as long as the speaker wire isn't interferred with.