Lead is preferable for weighting speakers IMHO. Handle it gently; just don't put it in your mouth or nose and you won't die or lose your mind.
Given the possible toxicity, I put it in ziploc bags first - the in the speaker base.
When I have used it, I wore nitrile gloves and a basic painter's mask. Just handle the lead gently and if possible, don't pour it from one container to another as this might create dust.
Remember - don't eat, breathe or otherwise ingest it.
Here's a link: http://www.rotometals.com/Lead-Shot-s/64.htm
You want 8.5 or 9...
Given the possible toxicity, I put it in ziploc bags first - the in the speaker base.
When I have used it, I wore nitrile gloves and a basic painter's mask. Just handle the lead gently and if possible, don't pour it from one container to another as this might create dust.
Remember - don't eat, breathe or otherwise ingest it.
Here's a link: http://www.rotometals.com/Lead-Shot-s/64.htm
You want 8.5 or 9...