Holding company for SGR Audio. Australian owned and made high end active speaker systems SGR Audio design and manufacture a range of high-quality audio products, but we are probably most well known for our active loudspeakers. SGR History SGR Audio began as a Melbourne based father and son initiative to deliver world class audio excellence. Harry Ralston, the father, has been involved in the audio industry for over 40 years. Stuart Ralston grew up surrounded by audio equipment so it came as no surprise when he followed in his father's footsteps. Now Harry and Stuart are an inseparable team combining the best of both generations. Harry's strong business values and extensive industry experience proved the perfect match for the advanced electronics knowledge, the exposure to modern technologies, and the fresh insight that Stuart's youth brings.