The TOPPING U90 USB Audio Bridge is Now Available on Apos Audio

Take IIS to the next level

If you’re ready to take next-level control over IIS, we think you’ll be interested in the TOPPING U90, the latest addition to the TOPING 90 stack. With four IIS controller switches, you can choose pin definitions for IIS phase, MCLK, DSD flag, and IIS DSDR, giving you much greater control over IIS inputs. Additionally, a built-in USB audio isolator eliminates ground loop noise from your source.

Product highlights

  • Supports PCM 32bit/768kHz and DSD512 Native
  • 7 outputs
  • IIS controller
  • Built-in USB isolator 
  • 12V trigger

Head on over to the TOPPING U90 product page, and if you need more information please contact our dedicated Support Team via live chat online or email us at

As with all purchases, when you buy from us you get the Apos Promise for Free Priority Shipping, an Extended 2-Year Warranty, a 45-Day Return Policy, and our 30-Day Lowest Price Match.