Spice Girls fans complain 'awful' audio quality ruined reunion concert at Dublin's Croke Park

Four of the five Spice Girls returned to the stage on Friday night, kicking off their much-anticipated Spice World reunion tour in front of a crowd of nearly 70,000 fans at Croke Park.

But while it was a night of fireworks, iconic costumes and lots and lots of ecstatic screaming, not every fan was happy with the show.

Some took to Twitter complaining they were unable to hear the concert.

The problem appeared to be up in the stands, high above the action on stage.

"There's something wrong when the crowd at Spice Girls concert are all sitting down because no one has a clue what song is on because the sound really is THAT bad," Sabrina Egerton said on Twitter.

Ms Egerton said it was disappointing given she paid more than $170 for her ticket.

"The sound is awful," she said.

"No one has a clue what there're singing.

"No speakers on the levels at all. Just the ground."

Other fans agreed, some pointing out how much it pained them to criticise the singers, turning their dismay towards the venue and music promoter MCD Productions.

The ABC has contacted Croke Park and MCD Productions for comment.

Mel B, whose real name is Melanie Brown, addressed the complaints in an Instagram story after thanking fans for turning up to the show.

"We will see you in Cardiff," she said.

"And hopefully the vocals and the sound will be much, much better."

But despite the complaints, many other fans praised the performance.