What do stereos 2 1 and 5 1 mean, respectively

Stereo. Two channels are stereo sound and not surround sound, there is a difference)

Stereo Two channels plus a subwoofer is generally a computer speaker, for student parties, relatively cheap).

It is five channels, that is, surround sound (five speakers must be at equal distances around the listener, so as to have different sound effects, and must also be used in a special listening room; If there is furniture in the room, the sound will be undesirablely refracted and you will not be able to hear true surround sound).

If it's the same**, the sound quality is the best.

Listen to ** to buy speakers. For example, there are more than 2,000 KEF bookshelf boxes in the UK, with a frequency response of 50Hz-25kHz (+3dB), and a bass of only 50 Hz, but the high-fidelity sound quality makes it very comfortable to listen to songs.

Only bookshelves with more than 4,000 boxes have ultra-bass + high-fidelity sound quality. For example, the British Mengpai Copper 100 bookshelf box, **5,000 more, frequency response: +3db37hz-30kHz.

3dB is the HiFi standard, and 37Hz is ultra-low. Whether you watch a movie or listen to **, it is a first-class effect and shocking!

Surround sound is for watching movies, mainly pursuing the different sound orientation sensations of front and back, left and right, so sound quality is not its preferred goal.

Only the highest-end panoramic sound system (surround sound) has excellent sound quality, **tens of thousands of yuan.

It's two speakers, one left and one right.

It's two speakers and one more subwoofer,In fact, these two speakers simplify the accent function,Concentrated in the subwoofer。

It's 5 small speakers, called satellite speakers, plus a subwoofer. The satellite speaker is a front left, a front right, a rear left, and a rear right, because the human ear cannot accurately distinguish the direction of the accent, so the subwoofer can be placed more casually.

To put it simply. With five speakers, if placed correctly and the game or movie supports 5 channels, you can hear the sound behind you, such as someone talking behind you, a car behind you ready to overtake you, etc. Two speakers can't create that kind of atmosphere.

However, in general, this kind of use is rarely used.

The speaker has 6 speakers (speakers), including the main speaker, subwoofer, surround and other sound effects, which can only be used with a sound card, otherwise it can only be used as a speaker.

The speaker has 3 speakers (speakers), and if it is used on a sound card, just plug in the green jack.

Hello, these two refer to two systems:

Fingers: a pair of front + a pair of surround + a center + a subwoofer system. Refers to a pair of front-facing + a subwoofer system.

The above is a personal opinion, and I hope it can solve your doubts.

Generally speaking,The speaker of the channel is mainly used for watching movies, pay attention to the sense of presence, reality,The sense of space is very good。 To exaggerate it, if you watch a war movie, the plane takes off, and the direction in which the bullet flies can be realistically restored through the sound channel. (Of course, this also requires the internal sound processing circuit of the power amplifier and a good audio source input as a premise).

The channel is nothing more than a bass channel than the usual stereo sound, so listen to it, if there is no perfect sound processing circuit, it is difficult to achieve a strong sense of space.