HK Audio for Heart & Heavy Charity Concert
Picture: Da Noize Pics n Arts

The annual Heart & Heavy concert once again filled the Lebach Stadthalle with music, community spirit and extraordinary generosity, raising vital funds for children and families living with severe illnesses. As the flagship event within the wider Rock Meets Benefiz initiative, the concert has grown from a small grassroots idea into a major charitable tradition and HK Audio has proudly supported it since the very beginning.
Founded in 2017 by Carsten Graf and Christian Karlowatz, Rock Meets Benefiz has become a year-round community effort powered almost entirely by volunteers. More than 300 supporters contribute through donations, small fundraising actions and personal initiatives - helping the organisers raise an incredible €140,000 last year alone, all going directly to families in need. Carsten Graf, co-organiser of the event, said: “Heart & Heavy has really become the centre of what we do. This show brings everyone together - artists, volunteers, engineers and the whole community. Every contribution, no matter how small, genuinely changes lives.”
Co-organiser Christian Karlowatz highlighted the growth of the event and the importance of consistent partnerships like HK Audio’s: “We started as a tiny idea with almost no resources, just a desire to help. Today, Heart & Heavy has become something meaningful - not only for us, but for the children and families who depend on these funds. None of this would be possible without the people and companies who stand with us year after year.”
To give the concert the power and clarity it deserved, HK Audio put together a tailored CONCERT SOUND 2.0 system designed specifically for the space. At its heart was a COSMO C8 line array, delivering clean, even coverage throughout the hall. For the low end, the team built a cardioid subwoofer setup using CS 218 and CS 118 units - a configuration that kept the mix full and punchy for the audience while keeping the stage remarkably calm and comfortable for the performers. Up front, CX 210 LT cabinets handled near-fill duties, adding definition for the first few rows, while CX 12 monitors and dedicated drum fills helped the musicians lock in with each other onstage. The result was a setup that felt powerful, controlled and musical from every position in the room.
HK Audio’s Ole Osterthun, who configured and oversaw the system, said: “We built a special COSMO setup to get the best possible result in this venue. The cardioid sub array kept the low end powerful for the audience but surprisingly quiet on stage. Between the CX 210 LT frontfills and the CX 12 monitoring, the clarity was excellent - the musicians heard exactly what they needed all night.”
As Heart & Heavy looks to the future, the organisers remain committed to their mission: using music to bring people together and provide real, immediate help to those facing unimaginable difficulties. Karlowatz added: “This project may have started small, but the impact is huge and with more support, we can keep growing and keep helping the people who need it most.”
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