THe VR4JRs contain a separate compartment for the lead shot. The shot will not bounce around inside the main woofer box. Empty the shot directly into the compartment with the woofer box upside down. I found that a one liter water bottle with the bottom cut off makes a good funnel for putting the lead shot into the compartment. You may occasionally need to move the cabinet back-and-forth gently to redistribute the shot since it tends to pyramid as it pours in.
Once completed and reassembled you will notice an immediate and dramatic difference with the lead shot. Absolutely worth the effort. Be sure to use the spikes under the speakers once you've located them where you want them. Also, remember these speakers take about 500 hours to break-in fully. And, bi-wire them if at all possible. That short cable provided to connect the top and bottom cabinets is a compromise at best.
Once completed and reassembled you will notice an immediate and dramatic difference with the lead shot. Absolutely worth the effort. Be sure to use the spikes under the speakers once you've located them where you want them. Also, remember these speakers take about 500 hours to break-in fully. And, bi-wire them if at all possible. That short cable provided to connect the top and bottom cabinets is a compromise at best.