The meth was found in two containers concealed inside dozens of metal boxes that had been declared to Customs as "Single Loud Speakers", according to investigators.
Authorities say the 1,728kg (3,800lb) stash - the largest ever intercepted drug shipment to Australia - was found in January at a port in California.
The investigation appeared to reveal cooperation between Mexican cartels and Australian biker gangs, developing what authorities say is a worrying new vector for drugs to arrive to Australia.
Another 25 kilograms of cocaine, worth about $9.5 million, and 5kg of heroin valued at $2.6 million, was also uncovered in the shipment of 850 vehicle audio parts.
The previous record haul of meth seized in Australia was 1.3 tons in December 2017. An Australian law enforcement official called it "the biggest ever seizure of methamphetamine".
'Through a collaborative effort - pooling our information, resources and expertise we are keeping this risky contraband from reaching our streets and potentially saving lives'.
Australian police have arrested six people in Victoria and New South Wales after the biggest seizure of crystal methamphetamine in United States history. They were not identified except as a 52-year-old man and a 46-year-old woman.
Last month, police in Australia arrested cabin crew for Malaysia-based carrier Malindo Air on accusations they helped smuggle heroin and meth worth millions of dollars from Asia to Australian cities, as part of a multinational syndicate. "This is now flagging intent Australia is now being targeted", he said.
"This cartel is among one of the most powerful and violent drug trafficking syndicates in the world".
"By stopping this, we have ensured criminals will not profit from the huge pain these drugs would have caused our community", AFP Assistant Commissioner Bruce Hill told reporters.
"If this shipment had made Australian streets it equates to something like 17 million hits of ice". -Australian operation had stopped "a tsunami of ice" from reaching Australia. This is a serious warning.
They face various charges, including attempting to import illegal drugs, and face maximum sentences of life in prison in Australia if convicted.