I installed a Yamaha MG32-14FX sound board. My cordless mics sound so muffled.

The manual says that the stereo microphones are either side at the rear of the flash. Make sure nothing is near them. It also says that it can be affected if the flash is raised. It sounds like a firmware issue, and it is a pity there is no external mic jack socket.

https://www.google.com/search?q=nikon+coolpix+l820+video+muffled+audio

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Depends on what you mean by "muffled". Internal microphones and standard external ones are not high quality mics, but that sound I would describe more as fuzzy. So if you could be a little more descriptive I could help further.

It's probably the mic, or you have some mental condition. I'm going with the mic, try returning it and getting a new one and if there's no difference, then try the software you use on whatever it is you're recording it with.

Try to talk with your lips touching the mic . If there is any improvement open the mic housing very carefully and bring the capsule as near as possible to the top part of the housing .
hope this helps.

I think that rather than the mixer, that your front speakers may have a limiter built into the high frequncey amp. You may be asking them to do more that they are capable of.

Please get the microphones checked seperately If there is an impedance difference orr if the coil is damaged then this difference of sound is possible.
So just check it out or else replace the mic.

Its set too loud and the mic is way to close to your mouth. try seeting the boom mic about 2inches from your mouth!
It's a matter of experimenting with mic placement to get the best results. (If it'sd not a new unit, make sure that the microphone holes underneath the windsock aren't blocked up with debris!)

Good Luck

It is possible that your cell phone has gotten something covering the mic or dirt has gotten into it. There is a piece of felt that is used near the mic area. It is possible that it has moved or was never in the correct place. In order to know a person with experience would need to take th phone apart to check the mic area. Or you might just want to have a new mic added.

Check wind screen. Make sure output level is not higher than volume level.

If the wireless mic has an XLR output that matched the corded mic input, the answer to your question is yes.

Dan