<https://audiophilestyle.com/forums/topic/6164-ayre-qb9-upgrade-to-24192/#comment-70926>
<http://schema.org/text>
"The 192 kHz upgrade replace the USB receiver PCB with a new one and also requires a firmware upgrade to \"activate\" the rear panel DIP switches to select either Class One or Class Two Audio. There is no change in sound quality, just the added features. \n  \nThat is why we did not change the model name. When we improve the sound of a product, we change the model name (eg, \"AX-7\" to \"AX-7e\"). It is only important for the person who must have the latest of everything, as there are so few music files beyond 96 kHz. It also requires more stringent specifications from your computer. Please go to: \n  \nwww.ayre.com/usb.htm and navigate to \"Beyond 96 kHz\". \n  \n"
<https://audiophilestyle.com/forums/topic/6164-ayre-qb9-upgrade-to-24192/>