The group, whose self-titled debut entered the album chart last week at number four, said that they were keen to experiment on the LP, and eventually persuaded their label to let them write material for it.
"There were songs that our record company really loved which we thought were really generic," Jay McGuiness told the Daily Star.
"We've done something which will be panned by certain critics but others will think it's really inventive."
Tom Parker added: "A few people have commented on 'Behind Bars', which is the song we did the first time we went into the studio together.
"In one day we came out with that, so I love it when people say it's their favourite. We all have really different ideas and different musical backgrounds, so we'd sit there and have lots of cups of tea and everyone would put in a line here or a melody there. It just worked."
Meanwhile, Parker also hinted at a 2011 UK headline tour, revealing: "Tickets go on sale soon and it's going to be for March probably. Hopefully we can get a couple of arenas in there."