I'm using the Floureon® Condenser Microphone 3.5mm BM-800 Studio Recording Mic with the InnoGear® 48V Phantom Power Supply but I'm getting a buzzing noise in the background when I use the phantom power, and the only way I know to avoid that is to turn down the sound, making it hard to hear my voice.

I'm confused slightly because I'm being supplied with a in line to usb adapter, (or usb soundcard, i'm unsure), it seems the phantom power makes no difference if I don't use a external soundcard. When I do use it, the audio sounds fine except from the buzzing noise, is there anyway I can fix this or any more information? I'm fairly new to this. Thanks.

  • 1
    Could you draw your exact setup - what kind of devices you have connected to what, without omitting anything, even if you think it's not relevant? (with Paint.NET or whatever, and upload it somewhere) Commented Jul 1, 2016 at 21:30
  • I had the same problem. It was my USB port. Somehow, it's noisy. I hope this helps someone.
    – user19442
    Commented Oct 15, 2016 at 14:10
  • Possible duplicate of Buzzing, Hissing input level issues BM-700 BM-800 NW-800 Neewer/Floureon
    – Tetsujin
    Commented Sep 22, 2019 at 7:56

4 Answers 4


According to the information on the Amazon.UK page you cited, the Floureon® BM-800 microphone DOES NOT use phantom power. There is no reason to use the InnoGear® 48V Phantom Power Supply at all. Since you DO NOT need it, and since it adds extra noise, I can't see that there is any reason to use it at all.

  • The Q/A section as well as the other reviews state otherwise. You are right that is can run on 9V, but it's very quiet and the quality is bad.
    – SirMangler
    Commented May 1, 2016 at 23:41
  • I own one of these mics. I bought it after a myriad similar questions around the interweb. I does much prefer 48v phantom, but it will just about work [badly & noisily] on a PC headset jack, if that jack supplies condenser power. To use phantom you have to buy an additional XLR>XLR cable; the one in the box is TRS. Wired 'properly' as though it was a 'pro' mic, then it's actually not terrible; quite worth the $£€ 12 I paid for mine. [I shall continue to use my 3 grand U87 for proper work, though;)
    – Tetsujin
    Commented Mar 16, 2021 at 18:33

The kind of "can run on a desktop computer" handwaving info suggests that this is an electret condenser capsule rather than a "true" unpolarised condenser microphone in need of phantom power.

The phantom power, if any, will likely only be used for the internal FET preamp instead of polarizing the membrane. While the microphone is apparently fine with 48V, it does not need it. Instead it can get along with "plugin power" supplied through its 3.5mm cable. It's also unlikely that the connection is balanced even when using a balanced XLR cable (rather than the delivered one) and an actual microphone preamp with phantom power.

That means you won't get the common noise rejection of a balanced connection, and the quality of your phantom power circuit might depend on it. Also, you'll likely become much more susceptible to the switching power problems of your laptop supply by having another power supply in the loop without using balanced connections. This is a classical ground loop problem.

Try working without the phantom power supply, using "plugin power" instead (it's usually available on most mic inputs of soundcards or laptops, possibly by using some utility for switching it on).

The microphone you are using is not as much budget equipment as cheap equipment. I am surprised they even specify an equivalent noise level in their data sheet, and it is not actually bad for a small condenser capsule of 16mm diameter. Too good to be true would be my guess. Maybe they have just reprinted the capsule's spec without bothering to measure the whole microphone including delivered cable and their own plugin power circuit. At worst they have copied the specs from an unrelated microphone.

Personally, I don't think separate phantom power supplies make a lot of sense for computer recording these days. External sound cards of some quality will readily supply phantom power and you don't have to meddle with batteries or ground-loop-susceptible additional power supplies.

You'll still be able to use your BM800 with one of those and it will likely get the best out of that mic that you can hope to get, but considering the price of, say, a Samson C02 pair of microphones (still on the cheap and thus noisier side of budget, but manageable with good placement), meddling with plugin power designed equipment and unbalanced cables is just not worth it.


Reading various reviews on this mic [including the ones underneath your source at Amazon], it appears that it can run on anything between 9v & 48v. It can just about get 9v through USB alone, so tbh, if it works like that, use it like that.

I suspect you're getting mains hum over your 48v phantom supply, which is very likely to be incurable without further cost, as the external 'wall-wart' is probably the cause - I guess you could bin it & get a better-rated unit, but that would probably cost more than you've already invested in the mic & phantom together... which has to be said, isn't a lot :/

As a complete aside, I wonder whether that shock-mount would hold a U87, as a real one would cost more than 10 times that entire package...

  • Thanks, I didn't know that the Phantom Supply could cause that and it's good to know it wasn't the microphone. Does this mean the phantom supply is totally useless?
    – SirMangler
    Commented Apr 30, 2016 at 22:34
  • hard to say for certain - but bear in mind that is really budget stuff, so it's just not very surprising. if it works without it, just use it without.
    – Tetsujin
    Commented Apr 30, 2016 at 22:37
  • @Tetsujin, would care to elaborate a bit on the supply of 9V from the USB? I always thought that the protocol supports 5V power supply (of course I may very well be wrong about it). If this is the case, that would see the need for a step-up regulator right?
    – ZaellixA
    Commented Mar 16, 2021 at 7:42
  • @ZaellixA - I gave up trying to figure out the spec on these mics a while ago & just bought one (12 quid, why not;) They supply an XLR>mini TRS which is neither use nor ornament if you own a Mac which doesn't do that 'electret voltage' thing that some PCs can do. It probably won't be any use on any modern TRRS headset jack structure at all. Instead, I route it it through the same phantom mic pre as my more usual U87 & it works just fine. It's actually better than I expected it to be. It ain't great, but it kind of works for a voice-over or certainly for any vlogger-type youtoob scenario.
    – Tetsujin
    Commented Mar 16, 2021 at 18:40
  • Assuming all else is of sufficient quality, the noise floor is certainly acceptable, if not stellar, even for a solo voice.
    – Tetsujin
    Commented Mar 16, 2021 at 18:40

Can you still return it? Then try that. Seeing that price, gee, this is an extremely cheap product. Great membrane condenser mics for 100 bucks are considered cheap already.. So it may be easy to simply get a defective device. Something not soldered properly. Bad material, like partially corroded copper that's supposed to have low resistance. (I've seen super cheap cables that had that). Especially bad when it's the shielding that's not connected properly.

  • try different cables
  • if you know someone who has good a quality audio interface with microphone preamps or other sort of recording gear, be it just a mixing console with headphones or speakers connected - try whether your microphone and/or cables work there, without all that usb stuff connected, to narrow down the problem
  • you might have a ground loop somewhere
  • If you can get the mic replaced for free, try that, before you can't anymore

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.