I have used both the Fifine AM8 and K688 for over half a year.
If you’re choosing between them, start with the mounting arrangement. I’d pick the AM8 without an arm and the K688 if an arm is planned. Their sound differs, but where the microphone can sit affects everyday use more.
Either way, the requirement to speak close to the microphone remains the same. Both models feature low gain, meaning you need to keep the mic 10 to 20 cm from your mouth to get proper sound levels. Fifine even released a setup guide after reports surfaced that USB volume levels dropped in Windows 11.
AM8 Is an All-in-One Desk Microphone
The AM8 comes out of the box with a desktop stand and cable, making it ready to use immediately. It weighs 590g with the base attached, so it won’t slide around on your desk. The RGB lighting can be turned off with a long press, so it isn’t an obstacle.
The stand doesn’t adjust in height, and there’s no screw to lock its tilt. With the cable exiting at the back, tilting fully can catch it against the bracket. A low desk or a taller user makes that limitation more noticeable.
K688 Requires Factoring in the Cost of a Boom Arm
The K688 comes with a metal shock mount, but it does not include a desktop stand or an XLR cable. The shock mount blocks desk vibrations from traveling up into the microphone. However, you will need to purchase a boom arm separately.
The Fifine BM88 boom arm features a low-profile design that stays out of the way of your monitor. It supports up to 1.5kg and has a reach of 706mm, which might feel a bit short on larger desks. Instead of springs, it uses a hex wrench to tighten the joints. Some reviews note that after mounting the K688 for a long time, it began to sag and required retightening. It is best suited for users who prefer a set-and-forget setup.
Sound Differences Come Down to Direction, Not Superiority
The frequency response range is 50–16,000Hz for the AM8 and 70–15,000Hz for the K688. Most human voices fall within both ranges. The real difference lies in the tonal character. The K688 has a boost around 2kHz that makes articulation clearer, projecting the ends of your words forward. The AM8 rolls off the highs slightly, resulting in a rounder, heavier tone.
Dynamic mics emphasize bass as you get closer. One AM8 reviewer attributed much of its weighty sound to speaking right against it. Keep the distance equal if you want to compare the two fairly.
Which Mic Fits You Depends on Your Setup and Voice
Recommended AM8
- Those who want to use the mic straight out of the box without a boom arm
- Users with sharp voices who need a rounder tonal quality
- Gamers looking to match an RGB desktop aesthetic
- Users whose height and desk level align well with the default stand angle
Recommended K688
- Those who already use a boom arm or plan to buy one
- Users who want to emphasize clarity in pronunciation and word endings
- Environments where keyboard typing vibrations travel up through the desk
- Users wanting to minimize monitor obstruction using a low-profile boom arm like the BM88
Put the AM8 on an arm and much of the practical gap between the AM8 and the other microphone disappears, leaving the shock mount as the main difference. I’d also watch for a Fifine firmware response to the USB volume issue. For now, ask whether the included stand suits the desk you’ll still be using a year from now.
After alternating between the microphones for more than six months, I have a fuller item-by-item comparison to put together. I plan to post that separately rather than trying to settle every part of the choice in this mounting-focused guide. It will include recordings made at the same distance and gain settings, so the examples have a fairer basis for comparison. For now, the practical question is where the microphone will sit and whether the stand or arm fits that space. That is the difference I would resolve first, before expecting a frequency-range figure to make the whole decision.
