Looking for a non-DAC chip, multi 3.5mm to singular USB-C

[Citrusbyte]

So I ordered a helmet comms unit and it takes a USB-C input (which is also pretty thing with the port). I don't want to use the speakers that come with it, and the microphone has a specific dongle type I believe is unique to the speakers for the brand.

So I bought some Moondrop Quark 2s, as well as a basic lav mic off of Amazon, but when connecting the IEMs to the unit through a 2 to 1 adapter, the sound that plays is like a low quiet static with the BPM of whatever music I'm listening to. So I think the issue is that the comms unit is getting messed with by the DAC, so now I need to find at least a way to do a 3.5mm female to USB-C male adapter without a DAC chip. Also if it helps, the comms unit is a Blaise V15s.

TLDR: I need to make a connection from 3.5mm to USB-C w/o DAC.

 

[RandomEar]

Hi. I think you need to explain a little more what inputs the device has, how the factory speakers and mic are connected and what "2 to 1" adapter you were using.

Because based on what I could find, the Quark 2 is a USB C IEM but the Blaise only has a USB charging port? Those usually dont carry data signals. And how does the 2 to 1 adapter come in here? Is it a USB splitter?

EDIT: Any connection from USB to 3.5 mm without a DAC will also not output any sound (because that's what the DAC is for), unless the host device has a DAC itself and supports a passive pass-through mode for USB which I have only ever seen on smartphones.

 

[Roland68]

So I ordered a helmet comms unit and it takes a USB-C input (which is also pretty thing with the port). I don't want to use the speakers that come with it, and the microphone has a specific dongle type I believe is unique to the speakers for the brand.

So I bought some Moondrop Quark 2s, as well as a basic lav mic off of Amazon, but when connecting the IEMs to the unit through a 2 to 1 adapter, the sound that plays is like a low quiet static with the BPM of whatever music I'm listening to. So I think the issue is that the comms unit is getting messed with by the DAC, so now I need to find at least a way to do a 3.5mm female to USB-C male adapter without a DAC chip. Also if it helps, the comms unit is a Blaise V15s.

TLDR: I need to make a connection from 3.5mm to USB-C w/o DAC.

That isn't a standard USB-C port; it simply uses a USB-C connector with a custom pinout defined by the manufacturer. This has nothing to do with the USB standard, and nothing commercially available will fit it, and that's intentional.

Furthermore, using in-ear headphones voids the communication device's type approval or operating permit.
If you are involved in an accident, the consequences could be severe: if you are at fault, you could be held personally liable for the full amount, and insurance companies could seek full reimbursement from you—whether the sum involved is four figures or seven.
Legal precedents have also shifted in many countries. If the accident is linked to the use of a communication device—for instance, because you failed to hear police, ambulance, or fire department sirens—you could face a prison sentence, as the judge might deem your actions intentional.

 

[john61ct]

If you are going to proceed regardless of legal liabilities, from a practical POV you probably need to just operate with the analog output of whichever component.

In fact, that is dictated by your "no DAC" requurement anyway

 

[Citrusbyte]

Thanks for the responses, I decided to bite the bullet and return the one I have and get a different unit made for 3.5mm. Also thanks for the heads up about the legal bits, but I will say where I'm from riding with earplugs is common practice, and I've had it recommended to me by everyone I know who rides. Even my riding permit instructor said he ended up with tinnitus and that earplugs while riding are a good investment.