Huxa3em wrote: actually it is audible up to 90hz, the loudspeaker is flying like crazy, but you can only hear it as the air tube blows, nothing more.
So, as I thought - this type has and you will not do anything with it.
Huxa3em wrote: I put the loudspeaker in the corner of my colleague's room at home for a moment, the bass was good
You have created a substitute for a horn column in this way) not to be confused with the waltz with the loudspeaker to the car!). This setting results in several times increasing the amount of bass (but only in the range that the speaker can move).
Huxa3em wrote: Can you offer me a Bluetooth speaker with good bass?
I am sorry but I have never been interested in such inventions. I'm from an old school, the way a phone buys it so that I can communicate with someone and not just to prowl the Internet or listen to music. Similarly with MP3 - I think there are much better sounding devices for recording and playing music. I'm sorry, I will not help you.
Huxa3em wrote: what I have is a little while it is big.
In 99% of cases it is a close relationship - either bass or small size.
Otherwise - In order for the loudspeaker to radiate low frequencies sufficiently effectively, it must be large - have a large diaphragm. The second option is that the membrane may be smaller, but it must make up for it with a greater vibration amplitude - not every loudspeaker is capable of this. It's just about the mass of the "pole" of the air that the membrane will set in motion - the higher the mass, the easier it is to get a sufficiently large amount of bass.
Curiosity:
There is also a third option which is used by almost all producers of "flat" TV - the so-called psychoacoustic processor. "Sound before it is sent to the power amplifier and further to the loudspeaker (we know all the dimensions of the speakers in LCD TV

) is specially "machined" - by adding to the frequency of fundamental (low) tones nad-harmonics. Hearing does not really cope with the distinction, whether what you hear is true 40Hz or a set of harmonics in the right proportions - thanks to this we have the impression that despite the small speaker size the sound is more saturated bass / has more dynamics and generally sounds better.
Has such a patent reached and to portable loudspeakers with a signal sent after BT - I do not know - as I wrote I am not interested in this branch of audio.