QB9-DSD

About the QB9-DSD

The Ayre QB9-DSD is a premium USB DAC designed to convert computer audio into high-resolution sound with minimal jitter and noise. It supports asynchronous USB input with PCM sample rates up to 192kHz and DSD64 (2.8224 MHz) formats. The DAC uses the ESS Sabre Ultra ES9016S 32-bit converter chip in a parallel topology for enhanced performance. It features a minimum phase digital filter with single-pass 16x oversampling and zero-feedback, fully balanced discrete analog output stage without op-amps. The unit includes an Ayre Conditioner power-line RFI filter and AyreLink communication system. The USB input is optically isolated to reduce noise, and the power supply has a dedicated line for USB to ensure low noise levels. The QB9-DSD has balanced XLR and single-ended RCA outputs, with output levels of 4 volts balanced and 2 volts single-ended. It has a compact aluminum chassis measuring 8.5"W x 11.5"D x 3"H and weighs 5 pounds. The device offers two user-selectable digital filter algorithms via rear DIP switches and supports USB Class 1 and Class 2 audio modes for compatibility with various operating systems. It is highly regarded for its transparency, natural sound, and detailed musical reproduction, making it a top choice for serious computer audio enthusiasts.