A mammoth sex abuse hearing against Alan Jones has been locked in despite claims the radio host was kept in the dark about the police investigation against him.

The 84-year-old faces 25 charges of indecent assault and two of sexual touching against nine alleged victims.

There were 139 prosecution witnesses in the case, crown prosecutor Emma Curran told Downing Centre Local Court on Tuesday.

Efforts to reduce these numbers had stalled because Jones would not say which senior counsel he had briefed, she told Magistrate Glenn Walsh.

Defence solicitor Bryan Wrench said his client would also call his own witnesses, saying "we believe there is an iceberg of exculpatory material".

Jones' legal team has asked prosecutors to reconsider a decision made in September to hold the lengthy hearing i

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