What is Reddit's opinion of Mini Portable Speaker, 3W Mobile Phone Speaker with 250mAh Lithium Battery Line-in Speaker with Clear Bass 3.5mm AUX Audio Interface, Plug and Play for iPhone, iPad, iPod, Tablet, Computer (White)?

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Can't speak for the quality, but you can get little rechargeable battery powered speakers designed for smartphones.

Do you mean plug a speaker into a computer?

The speakers I have are mini speakers:

https://www.amazon.com/gp/product/B01NCQ5BAM/ref=oh_aui_detailpage_o04_s00?ie=UTF8&psc=1

The speakers do not emit noise. Are you instructing to bend head down to listen at where the jack plugs into the computer?

The jack is plugged into the computer. How to place a finger on it?

>You must apply at least 45db amplification to hear it.

Instructions? What does it sound like?

Could subscribers test their speakers and post the recordings?

>I have been using an oscilloscope to measure the frequencies and waveforms on my living environment and works alternating current. I will make this future knowledge once I gather and compile all the data. It should be noted that every time I hear stomps, creaks etc, I see pulse code modulation on the line ranging from 2.4khz and up. I have been using an oscilloscope to measure the frequencies and waveforms on my living environment and works alternating current. I will make this future knowledge once I gather and compile all the data. It should be noted that every time I hear stomps, creaks etc, I see pulse code modulation on the line ranging from 2.4khz and up.

2.4 khz is ultrasound.

>Ultrasonic (20,000 Hz to 100,000,000 Hz) and, finally to Megasonic (100,000,000 Hz and above). Future blogs will explain in more detail properties of sound waves in the Ultrasonic and Megasonic region, but the basic effect of frequency is the same in all cases.

https://techblog.ctgclean.com/2011/09/ultrasonics-sound-frequency/