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An introduction to FIFINE K669B, based on information from the maker and distributors: what it does, how to use it and who it may suit. It is not scored.
Built with simplicity and stellar performance.
— FIFINE official site
What is K669B?
The K669B is a USB condenser microphone from FIFINE. It connects to a computer with a single USB cable, so you can record or stream your voice without a separate audio interface or mixer.
It uses a cardioid (unidirectional) capsule, which the official page describes as designed to capture the voice clearly while reducing background noise. The listed frequency response is 20 Hz to 20 kHz.
The body is metal and comes with a tripod stand for the desk. The mount thread is 5/8 inch, so a 3/8-to-5/8 adapter is needed for 3/8-inch arms. A gain knob on the body lets you adjust the input level while you are live.
The official page lists gaming, streaming, podcasting, meetings and music as uses. It is stated to work with Windows, Mac and PS4/PS5, and sits in the simple, easy-to-set-up category.
The maker says it works by selecting the mic as the default input in the operating system, without extra software. Example compatible apps include OBS, Discord, Zoom, Webex, Twitch and Audacity.
Power comes over USB (70 mA) and no phantom power is needed. It cannot be connected to a mixer or audio interface, so moving to an XLR setup later would mean a different microphone.
Plug-and-play USB
It runs on USB power, so no phantom power is needed. The computer treats it as a standard audio device, so it can be chosen as an input without a dedicated driver. That can help when you want to start recording quickly.
Cardioid capsule
The pattern favors sound from the front and is less sensitive to the sides and rear. The official page presents it as a design for reducing background noise. It may suit desk setups where you speak toward the mic.
Gain knob on the body
The knob changes the input level in real time, and turning it to zero gives instant privacy according to the official page. You can adjust without opening a settings screen, which may help during a live stream.
Metal body and tripod stand
The metal body ships with a tripod stand for the desk. The 5/8-inch thread lets you move it to a stand or arm. It is convenient if you want to start without buying a separate stand.
20 Hz to 20 kHz response
The official specification covers the audible range. Sensitivity is -43 dB ±3 dB and max SPL is 130 dB. These figures point to close-up use such as speech or singing.
Software and device support
The official page lists Discord, OBS, Twitch, Zoom and Audacity among supported software. It works with computers and PS4/PS5, but not with Xbox, mixers or audio interfaces. Phones are not recommended because of insufficient power.
Compatible apps
The page lists Discord, OBS, Twitch, TeamSpeak, Audacity, Zoom, Webex and Amazon Chime among compatible apps; you simply select the mic as input.
No phantom power
Runs on USB power (5 V, 70 mA) with no external power unit.
Color options
The product page shows black plus red, green, white, blue and silver-toned variants; availability may differ by region and time.
Specifications
| Item | Details |
|---|---|
| Type | USB condenser microphone |
| Polar pattern | Unidirectional (cardioid) |
| Frequency response | 20 Hz-20 kHz |
| Sensitivity | -43 dB ±3 dB (1 kHz) |
| Equivalent noise level | -80 dBFS |
| Max SPL | 130 dB (1 kHz, 1% THD) |
| S/N ratio | 78 dB |
| Power | USB 5 V / 70 mA |
| Connection | USB |
| Mount thread | 5/8 inch |
| Sample rate | Not listed |
What is included and system requirements
- Microphone
- Tripod stand
- USB cable
- Works with Windows, Mac and PS4/PS5 (not Xbox, mixers or audio interfaces)
- The official page does not give a full box list
How to use it
- Connect the USB cable to the microphone and the computer.
- Place the tripod stand on the desk and set the microphone on it.
- In the computer's sound settings, choose this microphone as the input (on a Mac, 'USB PnP Audio Device').
- In your recording or streaming software, set the input device to the same microphone.
- Speak about 6 to 12 inches from the front of the microphone, as the official FAQ suggests.
- Turn the gain knob on the body to set your level.
- Turning the knob to zero silences the input, which is useful when you step away.
- If you use an arm, check the 5/8-inch thread and the adapter for 3/8-inch mounts.
Streaming and gaming
It works with the software the official page lists, such as Discord, OBS and Twitch. The gain knob lets you adjust the level while live, which may suit solo streaming.
Podcasts and radio-style talk
The unidirectional pattern and a spoken-toward-the-mic setup may suit one-person desk recording. Starting with just one USB cable is also easy.
Online meetings
The official page says it works with Zoom, Webex and similar tools. Standing the mic up and talking may be enough for home meetings.
Simple vocal recording
The response is listed as 20 Hz to 20 kHz. It may be a way to start recording your voice into a computer without an audio interface.
Calls and meetings without a headset
A desk-standing mic may suit people who prefer not to wear a headset.
A first external microphone
With a USB-only setup, it may be an easy first step for those new to audio gear.
Who it may suit
- People without an audio interface who want to start with USB only
- People who want an easy voice upgrade for streams and online meetings
- People who mostly record alone at a desk
- People looking for a first microphone
Good to know before you buy
- There is no XLR output, so it cannot connect to a mixer or audio interface (the official page lists these as incompatible).
- Xbox is not supported. Phones are not recommended because of insufficient power.
- The official page describes the cable in two ways: 'USB-B to USB-A/C' and 'USB-A to USB-A/C'.
- The mount is 5/8 inch; 3/8-inch arms need an adapter.
- The FAQ advises against using it with smartphones because of insufficient power.
- On a MacBook, select 'USB PnP Audio Device' as the default input, per the FAQ.
How it differs from similar products
We do not pick a winner; the official figures are placed side by side.
FIFINE K669
The K669B is listed at $37.99 and the K669 at $34.99 on the official site. Both pages list the same sensitivity, max SPL and S/N figures.
Price
$37.99 (FIFINE official site, checked 2026-10-27). Prices can vary by region and promotion, so check the official page before buying.
Sources: fifinemicrophone.com (checked 2026-10-27)
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