Question 1

Will this device switch microphone inputs as well? I play to connect this to a laptop to switch between headphone/mic inputs.

Accepted Answer

You should look into mixers? Mixers have multiple inputs and one output for speaker. It has a jack for headphone.

Question 2

Does have to plug into the tv or use Bluetooth

Accepted Answer

You plug the speaker output on your TV or computer to the Input then you have the availability to plug in external speakers or headphones.

Question 3

My speakers and headphones make pop-noise whenever turning it on, Can I just leave it on with the lowest volume when not using it?

Accepted Answer

The reason for the popping noise when the amplifier is turned on is that it does not have a capacitor in line with the power supply.  The amplifier produces sound through electrical current, so the initial surge of electricity when the device is turned on, causes a kind of signal to be forced through to the headphones.

In theory, such a thing could cause damage to a speaker, if the "signal" overloads the power ratings of the speakers, but in practice, this is not very likely, especially for an amplifier like this one.  The bigger issue, to my mind, is that if you're wearing headphones and the volume is turned up, you may expose your ears to a rather loud pop, which could be harmful.

So, yes, you could avoid the problem by not turning the unit off but only turning the volume down.  I would still recommend, however, the step of putting your headphones on only after you have plugged them in, and if you do turn the amplifier off, putting your headphones on only after you have turned the unit back on.

Question 4

I bought 8 of these and we have tried several. And we have tried using difference stereo cables. No matter what we do left side only??

Accepted Answer

Mine works fine.
Please check the source, sometimes happens that there is the problem with the setup. Just put some basic headphones with volume and check that the source is sounding fine, complete

ASIN	B08XZL91VT
Age Range Description	Adult
Best Sellers Rank	109 in Headphone Amplifiers
Box Contents	12V DC power adapter1, Use manual1
Brand	Fosi Audio
Brand Name	Fosi Audio
Colour	Black
Connectivity technology	Wired
Control Method	Touch
Control Type	Button Control
Customer Package Type	Standard Packaging
Customer Reviews	4.4 out of 5 stars 671 Reviews
Enclosure Material	Metal
Form factor	In Ear
Headphone Form Factor	In Ear
Is Autographed	No
Is Electric	Yes
Item Weight	172 g
Manufacturer	Fosi Audio
Model Name	Fosi Audio PH04
Model Number	PH04
Model name	Fosi Audio PH04
Network Connectivity Technology	Wired
Noise Control	None
Noise control	None
Number of Items	1
Product Features	Volume Control
Product Warranty	2 year manufacturer
Style Name	In The Ear

Fosi Audio PH04 4 Channel Headphone Amp, Portable Headphones Amplifier Splitter 4 Way for Music Studio, Mixer Audio Sharing Podcast Monitor, Supports 15-150 Ohms with 12V Power Adapter

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