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It looks like the noise you are experiencing comes from a USB ground loop. USB galvanic isolation will directly cure this. I couldn't find out whether the Topping D50 III does USB 2.0 or 3.0. They only state that it's C-Type, which can do both. You maybe ask their support before. In case of 2.0, the...

I'm unaware of this problem (and there is no firmware update available for this). Looks like this is a specific thing with the OWC Dock?
Does the isolator also go to sleep mode when the computer does? You can watch this by the green (or blue) LED on the device which should turn off.

I don't think that the isolation of your 7055-C is broken. There are two differences between 7055-C and 7054 that affect your issue. 1. The 7055-C has a direct capacitive coupling between the two grounds while the 7054 has only parasitic capacitive coupling which is far less. The coupling is not onl...

1. Do you have a list of compatible chipsets? Ultimately, the USB problems you write above will depend on the installed chipset. If such list exists, where can I look it up? There is no list. The issue is really uncommon. I hear about it maybe one time a year. 2. What settings can be made in the OS...

The compatibilty issue is apparently with your host (the PC). USB isolation requires some budget in timing between upstream and downstream packets. From the description I suspect that the USB ports of your PC maybe have a too tight timing to provide the required budget. In this case, I'm afraid that...

That was meant a bit ironically, because there is a potential difference of perhaps a few millivolts between an audio device like a DAC and the computer. It really doesn't matter whether the maximum permissible isolation voltage is 5 kV AC or 1 kV DC. This is more relevant if, for example, a PC is t...

There is no theroetical benefit when using USB 3.0 cables. The extra wires within the USB 3.0 cable are simply not used when connected to a USB 2.0 DAC. The only practical benefit may be in a better cable quality when using original Intona USB 3.0 Industrial cables. The shielding is superb and may g...

Isolation rating really isn't important for audio unless you have a high votlage DAC

I recommend 7055-C as it is tuned for audio purposes.

Cable length of 5 meter is known to work.

I see the device has + and - inputs on separate BNC connectors. This looks quite uncommon to me. Are you using both + and - inputs? If not, I'd try to build an adapter that tightly connects a twisted pair cable (cat5 or so) to +/- and the screen to both BNC GND. If you measure unbalanced, tie the mi...

Yes it does. 4.5V is reasonable if wires getting long (USB devices should work down to 4.2V). When I look at https://quantasylum.com/products/qa403-audio-analyzer , there is already a built-in USB isolation. And on the screenshot, I can see a 50 Hz deflection. Maybe this is some capacitive coupling ...

Do you hear an audible click (internal relay) when supplied with AUX power?

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It looks like isolation won't help and an intona isolator won't help either. The error description sounds like a synchronization problem. The iMac outputs a packet of audio data every 125 us. The amount of data varies and adapts to the clock of the device (here your Iris DDC). To do this, the device...

I do have access to Dell Ultrasharm monitors and checked it. Works here. Unfortunately, I don't have a Startech available.

It is very rare that something does not work with USB isolation. The rule is definitely plug and play. Unfortunately, we are always blamed of our isolator not working correctly. However, there are only problems with exotic products, which mostly come from one-man companies. Strange coincidence, isn'...

It works without the Startech cable? I'm not sure how the Startech active cable actually works. I suspect that it tunnels all 2.0 transfers into 3.0 packets. This introduces issues which may cause trouble like this together with the isolation circuit. I'd try putting the isolator at the other end of...

The DC-DC controller max output is 500 mA. However, the circuit on the secondary side must also be supplied with that power which is about 90 mA.
If you need more current, you must use the AUX port. This is galvanically connected to the secondary side.

I doubt that this cable (I mean that one that doesn't work reliable) is even USB 2.0 compliant.

Go ahead, I don't see any problem with that.

I have observed this with several hub products and I don't know why this happens. What I also observed that those hubs worked fine with 7055-D.

The USB signal is always bidirectional. There is no need to alter the orientation of the isolator regardless of the purpose of the final device.

When the issue happens, is the hub itself still recognized by the OS?
Do the devices actually use the USB 3.0 mode at 5 GBps?

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I am not aware of a bug like this but please contact our customer support directly with your serial number. They will check if you probably run an outdated firmware version.

Can you describe color and blink rythm of the LED on the isolator?

The AUX port follows Micro-USB specification. Only +VBUS and GND are used. The data lines are AC-grounded (via capacitor, for EMI reasons) and can be viewed as "not connected". If you reverse the polarity, your AUX supply will be just shorted by the reverse diode of the detector MOSFET. If...

The noise figure can be guaranteed only when using the internal DC-DC and not the AUX port. This is because the AUX will be switched to the device port directly using a relay, effectively disabling the internal regulator. About the other questions, we will take some measurements and present them her...

We have already all workarounds implemented that can be done without becoming incompatible to standard devices. These handshake issues with some DACs cannot be fixed without enumaration + extra buffers (like a hub does).

The blinking lights show that the 7054 is stuck in Full Speed mode and didn't reveice a proper reset from the DAC. Placing a hub in between should help. Because a hub can simply switch modes after a timeout while the 7054 with its two isolation sides must rely on proper signalling on both sides.

Please look into your email inbox (maybe junk filter?). I have sent you the data a few days ago.

I suggest that you order one unit and test it. You can send it back for a refund if you run into issues.
I recommend 7055-D if you are also using USB 3.0-3.2. If you just need USB 2.0 Hi Speed at your end points, the cheaper 7055-B would do. They share the same 2.0 isolation circuit.

Of course! We have all the individual characterization data saved in a database.

This is recoreded correctly.
While 7055-B and 7055-D have an identical linear regulation circuit, the 7055-C is tweaked to get lower noise at audio frequencies.
Everything has a price.

That is very close to be a snake oil product. Based on lacking knowledge on EE and physics of a typical audio enthusiast (which is ok), this is money down the drain (and not ok).

You can try putting a usb hub in between. This helped a lot with similar issues.

Hi Chris,
I had a deeper lock into this back in 2016. It pointed out that the XMOS chip they use has an outdated firmware with known USB compatibility issues. I contacted Mutec and offered help but never received an answer.

There won't be any difference with the RPi4. The main difference to the -X model (other than isolation voltage) is that the -X has highly qualified parts that are suitable for harsh industrial or medical environments. It's understandable that this makes a difference in value for hi-end audiophile op...

We happen to have a 4262 in the lab. Yes, you unfortunately need to power the AUX port to get this scope working well. The typical noise out of a standard charging wall wart should not harm the performance of the scope in any way. (Hey, it's just 16 bits and the Picoscope preamp stage is very well d...

We of course accept legacy bank transfers. I don't know why we didn't receive your request. I suggest that you use our public email address that can be found on our "legal" web site. https://intona.eu/en/company/legal Btw: Paypal is the one of most reputable bank companies out there. So, y...

Using galvanic isolation requires 100% USB compliant devices and cables. Most audio devices on the market are not tested properly and may stop working when connected to an isolator. What very often helps, is connecting a USB hub in between either the device and the isolator or between the PC and the...

1. It is "dark" isolated. Same result as optical but with another technology. This is done using high speed CMOS isolators by Silicon Labs (formerly -- now sold to Skyworks Solutions). There is no way for direct optical isolation of USB 2.0 today. Using VCSEL (laser) technology like on the...

My Pi4B here is working perfectly fine. Maybe there is a USB-incompatibility in your setup. If you use "audiophile grade" USB cables, swap them with off-the-shelf gray USB cables just out of curiosity. You can also try a proper Computer (e.g. MacBook) with your DAC and the Intona isolator ...

The ground is completely isolated and has an air gap to extend the creepage distance even beyond the necessary. AUX is coupled tightly to the isolated side. This is for pushing more current to the device where the DC/DC isolation would be too weak. Any quality branded standard PSU has usually a very...

First, the USB 2.0 portion is the same in all 7055 models: isolation voltage is 5kV RMS and there is no intentional capacitive coupling. Isolation is granted between DC and GHz range (limited by the parasitic capacitance that is everywhere in nature and defined by clearance and air gap which is indu...

The APx series is known to be a bit flimsy when it comes to analog coupled, redriven 3.0 wires. This is what the 7055-C does. I suggest that you replace your isolator by the 7055-D model. This has true digital, optical, protocol-aware isolation. Another quick solution is to use the USB 2.0 portion o...

It looks to me that it's locked in a loop between suspend and wake-up. This is not normal and probably caused by a transient burst. There are burst-hardened firmware versions available that we tweaked for higher levels in IEC 61000-4-4 in medical applications. To discuss this further, please contact...

The isolator needs USB compliant cables. Often, "audiophile grade" cables have the screen or even the ground wire disconnected on one side. This is not compliant at all and this cannot work with galvanic isolation because the isolator breaks the shielding and ground by design and doing thi...

I am currently awaiting a Pi4B. I will have a look into the data transfer asap.

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