I prefer the sound when using TI’s ISOUSB211EVM compared to Core Audio USB P24 OCXO and JCAT USB XE cards. My first hand experience with the default settings – I was surprised by the improvement in layering, decays and details without being too digital. I bought two of these (only 1 unit allowed per order) since modifications need to be made.
ALLDAQ (Germany) and Virtins Technology (Singapore) are both PC-based measurement and instrumentation companies making products like oscilloscope. As mentioned earlier, Intona (Germany) makes USB2/3 Isolators for industrial use. Three of the companies listed above make industrial products.
Virtins Technology VT USB-ISO-480 USB High Speed Isolator (>800 mA, comes as USB dongle).ALLDAQ ADQ-USB 3.0-ISO-PS / 3.0 Isolator incl.Intona 7054-series USB-series USB2/USB3 Isolators.The following are the products we can buy as of March 2022: Most of the earlier products based on Silanna ICE08USB are no longer available for brand new purchase, which include: The list here is not comprehensive but includes the popular products. USB2 High-Speed Isolators available for purchase Analog Devices recently has the ADUM4165/4166 USB2 high-speed isolators available. In 2021 Texas Instruments (TI) announced their ISOUSB211 product to be available in Q3 2022.
USB DIGITAL ISOLATOR ISO
One of the integrated circuit (IC) for USB2 Isolation with support for high speed and used in many USB Isolation products (including Uptone ISO REGEN) was Silanna ICE08USB which was introduced in 2015 but discontinued in 2019.
USB DIGITAL ISOLATOR FULL
Most of the earlier USB2 isolators provided by chip makers like Analog Devices only work in USB2 low speed (1.5Mbps) and full speed (12Mbps) modes, hence they are not suitable for USB audio use. High-res music in PCM and DSD requires USB2 to operate in 480Mbps high speed mode.
From my experience, using industrial-grade USB isolator can improve the sound further even when the DAC has USB Ground galvanic isolation. Some high-end DACs already have USB Ground galvanic isolation inside the USB receiver. In audio use, it’s to isolate the noisy DC ground of the computer power supply. In industrial use, USB isolation was meant to protect computers from dangerous voltages in rugged environment, for example, PC-based oscilloscope used in automotive. Intona has the newer versions in metal case which can even improve Taiko Audio SGM Extreme USB Audio output. One person tried it with USB Audio signal path and discovered it indeed improves the sound significantly. The original Intona USB Isolator from Germany in crude plastic case was designed for industrial use. Budget USB isolators like Topping HS01 only provide Ground isolation unlike the industrial ones which provide isolation for ground, power and signal lines. The isolation voltage ranges between 1kV to 5kV. Most USB isolators were designed for rugged industrial use, but it works for audio as well. USB regen/reclocker PCIe cards have its own sound signature and the 5V DC supply really matters. USB2 Redriver has little improvement to SQ. I have evaluated USB2 Redriver and USB regen/reclocker cards. This is the first time I evaluate USB2 high-speed isolators.
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