Australian Border Force agents found 1.6 tonnes of methylamphetamine and 37 kilograms of heroin in vacuum-sealed packages lodged inside the speakers after the shipment arrived in Melbourne, they said.
"This is the largest meth bust we've ever seen in this country," border force commander Craig Palmer said.
The haul size demonstrates "the brazen nature of those involved in this criminal activity," he added.
No arrests were made in connection with the smuggling operation and police appealed to the public for leads on who was involved.
Palmer said the seized ice had a street value of A$1.2 billion and was the equivalent of 10 per cent of all the drugs seized by the border force in the previous year.
COMMENTS
Comments are moderated and generally will be posted if they are on-topic and not abusive.
For more information, please see our Comments FAQ