Reference Digital Audio 40, the new standard for digital S/PDIF signals. The Reference Digital Audio 40 employs a carefully designed geometry to achieve the precise characteristic impedance required for maximum S/PDIF signal transmission. The silver-plated conductors provide a low-resistance path for high frequencies.

The QED “Digiloc” plugs match the characteristic composite resistance of the cable more closely, reducing return loss by up to 1dB compared to conventional RCA plugs. This ensures optimal signal transfer and improved micro-timing of the audio signal.