What does a magnetic field strength of 0.418A/metre at a distance of 4.6 metres mean in real terms?

I'm not even sure if there's an answer to this question but thought I'd have a go - this is the postal restriction on sending magnets, and as I'm about to try to rehome a hefty pair of loudspeaker drive units (10" / 150W) I'm wondering if they're likely to be way above, way below, or somewhere around this, I have absolutely no concept of how strong a field "0.418A/metre at a distance of 4.6 metres" is! 

Anyone got any thoughts?



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