In August 2009, in an interview with Digital Spy, Ulf mentioned adding another singer to the group alongside Jenny, explaining: "We're just deciding now whether to add a fourth member to the group again or to bring it out under a new name.
At the moment we think it would be stronger with two female singers, so it's a little technical problem to solve."
During this time, Ulf and Jonas began recording songs with singer Julia Williamson, whom they met through Martin Dodd, who had originally signed the group to Mega Records.
Meanwhile, a new remix of "Cruel Summer" by Rico Bernasconi charted at No.
69 in Germany.

Jenny published her autobiography Vinna hela Världen in Sweden in September and announced that she was recording a solo album, which materialized in October 2010 as My Story.
In November 2009, Jenny confirmed via Twitter that she would not be involved with the upcoming album, but later clarified that she had not left, saying that "other constellations will have other names".

Two new singers were officially revealed in February 2010 as Clara Hagman, a contestant from Idol 2009, who Ulf met whilst appearing as a guest judge on the show, and Julia Williamson.
Jonas explained that "We will reform how we write the band name so that all old Acers can see the difference and don't have to be in panic.",
with Jenny commenting in April, "You are wrong about me leaving Ace of Base.
I just want to make everybody sure I have not left the group.
Ace of Base is still the original members.
We are bounded by law and by heart."

In a later interview with Aftonbladet, Jenny claimed "They didn't want to be with me", and that she was not allowed to participate in songwriting.
Jonas and Ulf then said in an interview with Scandipop that Jenny wasn't happy with plans to introduce a new member, and while she never formally quit the group, they felt that they had no choice but to proceed without her.

The new quartet maintained the original band name, but it was stylized as "Ace.of.
Base" on the artwork of single and album releases.
In July 2010, a track called "Mr. Replay" appeared on a Polish promo compilation for DJs, becoming the first release from the new line-up.
The first official single from the line-up, "All for You", was premiered on radio station Antenne AC on July 22, and was released on CD and download on September 10, debuting at No.
38 in Germany.

The album The Golden Ratio followed on September 24, entering the German album charts at No.
20.
In Sweden, the album failed to chart, backed only by a radio release of the album's title track "The Golden Ratio" in October, followed by a performance of "Southern California" on Bingolotto in April 2011.
An acoustic version of the album was being considered but never materialized.
No further singles were released in support of the album.

In March 2011, Jonas began releasing previously unreleased material to fans via the band's official Facebook page and the website ReverbNation on a semi-regular basis, in events they referred to as "Ace Thursdays".
Writing sessions for new material took place throughout the same year, though following the group's tour of Canada and Brazil in 2011, new music was put on hold.
In August 2009, in an interview with Digital Spy, Ulf mentioned adding another singer to the group alongside Jenny, explaining: "We're just deciding now whether to add a fourth member to the group again or to bring it out under a new name. At the moment we think it would be stronger with two female singers, so it's a little technical problem to solve." During this time, Ulf and Jonas began recording songs with singer Julia Williamson, whom they met through Martin Dodd, who had originally signed the group to Mega Records. Meanwhile, a new remix of "Cruel Summer" by Rico Bernasconi charted at No. 69 in Germany.
Jenny published her autobiography Vinna hela Världen in Sweden in September and announced that she was recording a solo album, which materialized in October 2010 as My Story. In November 2009, Jenny confirmed via Twitter that she would not be involved with the upcoming album, but later clarified that she had not left, saying that "other constellations will have other names".
Two new singers were officially revealed in February 2010 as Clara Hagman, a contestant from Idol 2009, who Ulf met whilst appearing as a guest judge on the show, and Julia Williamson. Jonas explained that "We will reform how we write the band name so that all old Acers can see the difference and don't have to be in panic.", with Jenny commenting in April, "You are wrong about me leaving Ace of Base. I just want to make everybody sure I have not left the group. Ace of Base is still the original members. We are bounded by law and by heart."
In a later interview with Aftonbladet, Jenny claimed "They didn't want to be with me", and that she was not allowed to participate in songwriting. Jonas and Ulf then said in an interview with Scandipop that Jenny wasn't happy with plans to introduce a new member, and while she never formally quit the group, they felt that they had no choice but to proceed without her.
The new quartet maintained the original band name, but it was stylized as "Ace.of.Base" on the artwork of single and album releases. In July 2010, a track called "Mr. Replay" appeared on a Polish promo compilation for DJs, becoming the first release from the new line-up. The first official single from the line-up, "All for You", was premiered on radio station Antenne AC on July 22, and was released on CD and download on September 10, debuting at No. 38 in Germany.
The album The Golden Ratio followed on September 24, entering the German album charts at No. 20. In Sweden, the album failed to chart, backed only by a radio release of the album's title track "The Golden Ratio" in October, followed by a performance of "Southern California" on Bingolotto in April 2011. An acoustic version of the album was being considered but never materialized. No further singles were released in support of the album.
In March 2011, Jonas began releasing previously unreleased material to fans via the band's official Facebook page and the website ReverbNation on a semi-regular basis, in events they referred to as "Ace Thursdays". Writing sessions for new material took place throughout the same year, though following the group's tour of Canada and Brazil in 2011, new music was put on hold.
Ace of Base