The volume, volume, bass (Bass, Treble or Tone), Balance, or echo or reverb control (Echo or Reverb) on the karaoke are all within the working range of the preamp. A lot of advanced home audio is separated from the two machines by the front and rear.
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The multi-knob mixer (Mixer) in the concert or studio is also a preamp. The main thing behind the concert is the post-production of the big output (it is very common to see more than a dozen units). Then I received those black and big speakers (called PA Speakers in English), and of course there are Powered Mixers that have their own post.
The Line out output of the SoundBlaster card on the computer is also equal to the pre-output, so you need to receive a Powered Speakers with a rear stage. Going back to the guitar speaker, if you see a Master Volume, it is controlling the output of the rear stage. Usually such a speaker will have two channels to control two channels (Channels), one is: the Clean Channel of the dry piano; the other is: the bullet with the distortion or the Drive Channel (two channels with a button or foot switch) Switch). There is another Volume button and other controls on the two channels, such as high and low sound, brightness, distortion (Gain or Drive), etc. These are the functions of the pre-stage (some brands of speakers before and after the volume button is written Pre and Post).
Why do you want to divide the volume buttons of the front and rear? This requires a little bit of discussion about the principle of distortion.
The earliest speakers were without distortion, and some guitarists turned the speaker volume to the bottom and broke it (just like you broke the sound of the home audio) and found it for music (to listen to Kinsky's early You Really) Got Me and Wild Thing). But it's not practical to turn the volume to the bottom at any time (always to be so loud). So there are two reforms:
First, the volume control buttons for the front and rear stages are separated on the speaker. The front stage is turned on, and the rear stage is turned down to make distortion without having to endure the loud volume.
Second, it is to do a modern pedal effect to first amplify the guitar signal to distortion, and then let the guitar player control the output through the volume control.
Seeing those who have front and rear volume control speakers should know how to make distortion without the distortion pedal? Even the front-level volume button of the Clean Channel of the dry channel is as large as the Master Volume. But the distortion is not strong enough, so some speakers have another Lead (or Drive) Channel with a Gain (or Drive) button that lets you boost the signal to high distortion in the front stage. In the vacuum tube, the distortion sound is better. The front vacuum tube in the speaker usually has only one, which is the smaller one. The other big ones are the latter.
Therefore, the principle of the front and rear adjustment of the speaker is: If you want the fuller tone (Full), the signal of the preamp is strengthened. When it is full, it will be slightly distorted, and then the signal will increase the distortion effect. Turning the Gain (or Drive) button and the front volume to the bottom on the Lead (or Drive) Channel is the most distorted sound for this speaker.
So there is an article that mentions the use of your equipment. In the United States, you can see that a guitarist can make excellent sounds without relying on the effects. These people must be able to integrate the front and rear of his speakers, Gain and other control buttons, know how to call out the sound. A mild overload like the TS-9 is not difficult to make in the front of the vacuum tube, but it is not as clean as the TS-9.
The overload caused by vacuum tube manufacturing is "natural"! What TS-9 does is "artificial"!
As for those of Digital's integrated effects (such as GNX-X, GT-X), they should not be called "functions with pre-levels." They are a predecessor! So the guitar is connected to them and then connected to the front jack of the speaker, then you actually pass the signal through two preamps. Each has its own function of controlling the sound, and the sound adjustment of the two front stages is to find a balance point to make the sound perfect!
Many speakers have two holes, Pre Out and Power In, which allow you to add an effect between the front and rear stages (not all effects are suitable for this!), so many people (including me) using this equipment (English called Effect loop) for the integrated effect is: guitar > integrated effects > Power In hole so that the front of the speaker itself skipped, all the front level sounds are Controlled by the integrated effect, any tone control buttons on the front of the speaker will have no effect.
But if you spend a lot of money to buy a speaker but only use its post-stage, it is a waste! Therefore, some guitarists connect the integrated effects to the latter (Power Amp) that is connected to the back of the Mixer, and then to the "box" of the lower body of the split Marshall (can be connected to the left and right to play a comprehensive Stereo effect of the effect). So someone asked a guitar cabinet behind what was behind a large cabinet? Rack-type integrated effects (sometimes more than one) plus the rear stage take up half of the cabinet!
[Supplementary Note]: Some speakers have a Line Out hole on the back. This hole is also the output of the front stage. The Power In that connects this hole to the other speaker becomes: a pre-stage control tone, two sets of subsequent levels and The horns work together to make a sound. You see some guitarists working with two large stacks of Marshall speakers in the concert video, usually the simplest possible connection.
At this point someone might ask if you can use Pre Out to do this? Because Pre Out is also the pre-output! When the line output of the general speaker is Pre Out, the line leading to the rear stage is cut off. Because the latter level is back from Power In after the signal! Therefore, the first speaker in this way will not sound.
Line Out is also used to receive recording equipment, but it is best to use the signal processing of Equalizer and other equipment, so that the recording sound is close to the microphone from the speaker.