What is the best speaker configuration for the speaker to use?

Question

Do it yourself

Hello.
It is necessary to assemble the speaker system in an extremely limited case. Case size - two blocks of 10x15 cm, 1 cm thick (maximum 1.3 cm in some places). The blocks are symmetrical, the shape is almost rectangular (imagine that these are two flat columns, the main condition is that the thickness cannot be more). Amplifier and power will be in a separate case. It's just the speakers. I found several speakers from the Chinese with sizes from 3 to 8 cm in diameter, which will fit in the given dimensions (in thickness). Among them are low-frequency, wide-frequency, high-frequency. And here is the question: what configuration is better to use? For example, two "LF, two SC, two HF" 4-5 cm each (whatever fits and does not touch each other) or "4 SC 8 cm", or "two SC 8 cm, two SC 4 and passive LF membranes" and so on, advise how best.
A couple of examples of speakers:
https://ru.aliexpress.com/item/1-5/32847330746.html
https://ru.aliexpress.com/item/2/32874153968.html
Here is an example column. The review says that it costs tweeters and woofers, as well as a passive membrane for woofers? But how does it work? Will there be a failure in the midrange? https://magazyaka.com.ua/upload/iblock/b11/b11ce60...

Answer 1

In the announced dimensions, it is silly to talk about frequency dips, so be guided by the size, the larger the diameter of the speaker, the less obscene it will sound.
Unless you should take high-frequency ones, they may turn out to be specialized "tweeters" for multi-band audio systems.
A passive membrane allows you to slightly improve the audibility of small speakers, due to such a membrane, you can increase the surface area of ​​\u200b\u200bradiating sound, sound waves from the speaker going inside the case will swing this membrane and it will re-emit sound, as if an additional speaker, but again, if there is room for membranes, it is better to put a second full-fledged speaker.
For ultra-compact audio systems, do not neglect sound "improvers", virtual expansion of the stereo base, etc., if the sound is from an android, it makes sense to think about installing SRS or dolby or other sound enhancement programs in the phone, some phones already have built-in enhancers.
If the sound is from a computer, then some sound drivers allow you to enable enhancers in the driver settings, they are usually useless with ordinary speakers, but sometimes they help with tiny speakers.
Alternatively, you can try to put a Chinese hardware improver like this aliexpress.com/item/Free-ship-3D-virtual-surround-BBE-tone-tuning-board-effect-is-better-than-QS7779-XR1075/32819694226.htm
on tiny speakers gives a good effect.