Altor, a private equity firm, agreed to acquire a minority stake in Marshall Group, a manufacturer of music equipment and audio products, from Zenith, a venture capital firm, and Varenne, a private investment firm. Financial terms were not disclosed. “We have formed a strong and positive agreement with Altor that will enable us to move forward in harmony and fully unlock Marshall Group’s amazing potential with the management team. We’re excited about building on the Marshall legacy together and creating value for all shareholders," Henri de Bodinat, Marshall Group Chairman.