The Short Answer
Yes—most USB microphones can work through a KVM switch, provided the KVM’s shared USB port supports general USB peripherals or USB audio devices, not just keyboard-and-mouse HID devices. A basic “keyboard/mouse only” KVM may supply power to a microphone yet never pass its audio data to either PC.
For the most reliable result, use a USB 2.0 or USB 3.x peripheral port on a powered KVM, connect the microphone directly to that port, and confirm that each computer detects it as an input device after switching. This matters especially with microphones that expose multiple USB functions, such as a mic input, headphone output, mute button, lighting controls, or manufacturer control software.
In 2026, many modern KVMs advertise “USB peripheral sharing,” “USB 2.0 sharing,” “USB 3.0 sharing,” or “USB audio support.” Those labels are more meaningful than an included USB cable or a front-panel USB-A port alone.
Compatibility at a Glance
| Factor | Requirement | Notes |
|---|---|---|
| KVM USB port type | A shared USB peripheral, USB 2.0, or USB 3.x port | “Keyboard/mouse” or “HID” ports may not support USB microphones. |
| USB audio standard | Microphone should enumerate as USB Audio Class | Class-compliant mics work best without vendor software. |
| Power | Enough stable 5 V USB power | Use the KVM’s power adapter for RGB, headphone monitoring, or high-draw microphones. |
| Host switching behavior | Full USB re-enumeration or supported USB emulation | Some KVMs briefly disconnect the mic every time you switch systems. |
| Drivers and software | Both PCs need a usable audio driver | Windows usually uses USB Audio Device automatically; vendor apps may need separate setup on each PC. |
| Firmware | Current KVM and microphone firmware where applicable | Updates can address device detection and USB handoff problems. |
| Cabling and adapters | Data-capable USB cable and suitable connector | A charge-only cable powers a mic but cannot carry audio data. |
What Determines It
Interface and USB Port Type
What causes it: USB microphones are audio peripherals, not keyboards. A KVM’s dedicated keyboard and mouse ports often use HID emulation to keep those devices logically connected to both PCs. That feature can improve instant switching for a keyboard, but it may reject or incompletely pass a microphone.
How to check: Read the labels beside the KVM ports and its specification sheet. Favor ports marked USB 2.0, USB 3.0, USB peripheral, USB sharing, or a generic USB symbol. Be cautious with ports labeled only Keyboard, Mouse, HID, or showing keyboard/mouse icons. On Windows, connect the mic through the KVM, then open Settings > System > Sound > Input. If it appears by name or as “USB Audio Device,” the audio connection is working.
What to do: Move the microphone to the KVM’s generic shared peripheral port. If there is only one such port, connect a powered USB hub to that port and connect the mic to the hub. Do not place the microphone in a keyboard-only port.
How to undo: Disconnect the hub or move the microphone back to a direct USB port on the computer. Windows may need a few seconds to restore the previous default input device.
Power Delivery
What causes it: A simple USB microphone needs modest bus power, but models with RGB lighting, onboard DSP, a headphone amplifier, gain knobs, or multiple audio channels can draw more power during startup. An unpowered KVM may become unstable when switching hosts, causing crackling, repeated reconnect sounds, or a microphone that lights up but does not appear as an input.
How to check: Test the microphone directly on each PC using its normal cable. Then test it through the KVM with the KVM’s external power adapter disconnected, followed by the same test with the adapter connected. On Windows, open Device Manager with Win+X, expand Sound, video and game controllers and Universal Serial Bus controllers, then switch the KVM. Repeated disappearance and reappearance indicates a handoff or power problem.
What to do: Use the KVM’s included or manufacturer-approved power supply. Connect the mic directly to the KVM first; if a hub is necessary, use a powered hub. Turn off unnecessary microphone lighting in its control app if the device is near the KVM’s power limit.
How to undo: Disconnect the external adapter or powered hub and reconnect the mic directly to a PC. Re-enable lighting in the microphone software if you disabled it.
Drivers, Default Devices, and Audio Apps
What causes it: Each computer treats the KVM switch as a USB disconnect and reconnect. Windows may select another microphone after the handoff, while Discord, OBS Studio, games, and browser tabs can retain the old device selection.
How to check: On Windows, go to Settings > System > Sound > Input and select the USB microphone from the input-device list. Use Start test and speak normally. In Discord, open User Settings > Voice & Video > Input Device. In OBS Studio, open Settings > Audio > Mic/Auxiliary Audio, or check the device selected in an Audio Input Capture source.
What to do: Set the microphone as the default input on both computers. For older Windows dialogs, press Win+R, enter mmsys.cpl, open the Recording tab, select the mic, and choose Set Default. In communication apps, explicitly choose the microphone by name rather than leaving the setting on “Default.” Close and reopen an app after switching if it does not reacquire the device.
How to undo: Return to the same menus and select “Default,” another microphone, or your webcam mic. In mmsys.cpl, choose the former device and click Set Default.
Firmware and KVM Switching Mode
What causes it: Some KVMs use USB emulation, while others perform a true physical USB transfer. A microphone generally needs true peripheral sharing or explicitly supported audio pass-through. Firmware bugs can also affect composite microphones that include audio, playback, HID buttons, and lighting control interfaces.
How to check: Look in the KVM manual or on-screen display for terms such as USB Pass Through, USB 2.0 Mode, USB 3.0 Mode, HID Mode, USB Emulation, or Audio Mode. If the KVM has a firmware utility, note its current version before changing anything. For a microphone utility, check its Settings, About, or Device page for firmware information.
What to do: Select USB pass-through or peripheral-sharing mode when the KVM offers a choice. Update KVM firmware only with the microphone disconnected and only while the KVM is connected as instructed by its manufacturer. Update microphone firmware while it is connected directly to one computer, not through the KVM.
How to undo: Restore the prior switching mode in the KVM menu. If an update creates a problem, use the manufacturer’s documented recovery or rollback procedure rather than interrupting power during another update.
Form Factor, Cables, and Signal Path
What causes it: USB-C microphones, detachable cables, extension leads, and USB-C-to-A adapters introduce additional failure points. Some USB-C cables are charging-only, and some adapters do not reliably support the required data path.
How to check: Connect the microphone with its original cable directly to each PC. If it works directly but not through the KVM, inspect the KVM-side port type and any adapter. Avoid stacking a USB-C extension, a coupler, and an adapter during our research.
What to do: Use a short, data-rated cable and the fewest adapters possible. For a USB-C microphone and USB-A KVM, use a USB-C-to-A data cable or a known data-capable adapter. Keep the cable away from loose front-panel extensions where possible.
How to undo: Reconnect the original cable directly to the computer and remove the adapter chain one piece at a time.
How to Check Yours
- Connect the USB microphone directly to PC 1 and confirm it appears under Settings > System > Sound > Input.
- Repeat on PC 2. If it fails directly on either system, the KVM is not the first issue to solve.
- Connect both PCs to the KVM using the KVM’s USB upstream cables. Video-only connections do not transfer USB peripherals.
- Plug the microphone into the KVM’s generic peripheral-sharing port, not a keyboard/mouse-only port.
- Power the KVM with its external adapter, then switch to PC 1. Select the microphone as the input device and run a test.
- Switch to PC 2, wait for the USB connection sound or device appearance, and repeat the test.
- Switch back and forth at least three times. Confirm the microphone returns every time and that Discord, OBS, or your game chat application uses the intended input.
If It’s Not Compatible
Use a separate USB switch: The cause is a KVM with HID-only USB ports. Check whether the mic works when plugged directly into either computer but never appears through the KVM. Use a two-PC USB 2.0 or USB 3.0 sharing switch specifically rated for peripherals, then press its physical selector separately from the KVM. To undo, reconnect the mic directly to the KVM or a PC.
Use an audio interface or analog mixer: The cause is a microphone whose USB control features do not survive switching. Check whether basic audio works but headphone monitoring, mute controls, or vendor software fails. A conventional XLR microphone connected to an interface or mixer can feed each PC through appropriate outputs, though routing must be planned carefully. To undo, reconnect the USB microphone and remove the interface from the input-device list.
Keep the microphone on one PC and route audio in software: The cause is a workflow where only one system needs the physical mic connection. Check whether you primarily record or stream from one PC. Use local monitoring, network audio software, or a capture workflow appropriate to your setup. To undo, stop the routing application and restore the normal Windows recording device.
FAQ
Can I plug a USB microphone into the keyboard port on a KVM?
Usually no. It may receive power, but keyboard ports are commonly limited to HID emulation. Use a generic USB peripheral port instead.
Why does my USB microphone disconnect whenever I switch computers?
That is normal for many KVMs because the new host must detect the mic again. If it does not return within a few seconds, use powered peripheral sharing, update firmware, and verify the selected input device in Windows.
Will a powered USB hub make an incompatible KVM compatible?
No. A powered hub can solve insufficient power or add ports, but it cannot make a keyboard-only HID port pass USB audio data. The hub must connect to a true USB peripheral-sharing port.
Do USB microphone headphone jacks work through a KVM?
They can, because the microphone often appears as both an input device and a USB playback device. Select its headphone output under Settings > System > Sound > Output on each PC, but expect it to reconnect after every KVM switch.
