Setting up an amplifier for speakers without a subwoofer. Correct setting of the subwoofer in the car. Setting up household amplifiers

How to properly configure a car amplifier? I'll tell you about setting up a car amplifier step by step. The principle of amplifier tuning.
Setting up midbass.
Please note that the tweeters will need to be turned off, and if a subwoofer is installed, then that too, either from the head unit or manually. We do not cut off the midbass from above with filters.
We divide our path into two parts:
1. Head unit;
2. Amplifier.
Each of these parts of the path introduces its own distortions into the signal, including distortions due to signal limiting (). Therefore, for the final fine-tuning of the matching of the head unit and amplifier, this process should begin with determining their capabilities. We will not focus on abstract concepts about the position of the maximum..., or so many percent of the maximum permissible...
Tuning is done using the 315 Hz track.
We will need a setup (test) disk Denon Audio Technical CD.
We can download the disk here:
Http://rutracker.org/forum/viewtopic.php?t=2258371
We will need the following tracks:
46. 40Hz Sine Wave (0 dB L+R) (0:30)
48. 315Hz Sine Wave (0 dB L+R) (0:30)
50. 3149Hz Sine Wave (0 dB L+R) (0:30) - dome tweeters
51. 6301Hz Sine Wave (0 dB L+R) (0:30) - horn tweeters
Green for SUBWOOFER
Red for the Ministry of Foreign Affairs
Blue for TWITTER
To burn a disc, download the program from the Internet.
You can create the necessary sines yourself using the SoundForgeAudioStudio program, but you must pay attention that their level is ZERO dB.
Please note that you should not listen to the speakers on the test sine for a long time!!!
Set the Gain (Level) control on the amplifier counterclockwise to minimum. By this we prevent the possibility of introducing distortion into them by limiting the signal.
We disable all additional (set by us) settings on the GU!!!
- We put a track with a frequency of 315 Hz (track No. 48 on the disk) and by adjusting the volume knob we determine the level of signal amplification when a tone appears stepwise in the region of 1 kHz (1000 Hz). This will be the level above which there is simply no point in turning the knob, since further distortion will simply follow. You still need to focus not on this level (already audible distortion), but on a step or two below the volume control, depending on the level adjustment step grid on the head unit.
If, in the process of determining the maximum possible pure level of the signal from the PG, partially subtonal changes in the tone of the frequency 315 Hz appear somewhere, then this is a reason to think about the quality of the PG.
All! The maximum possible clean (with minimum distortion) level of amplification of the head unit has been sorted out, and it will be possible to move on to matching the identified maximum level of the output signal of the head unit (GU) with the level of amplification that the amplifier can provide.
- We also set the track with a frequency of 315 Hz, and set the GU volume level knob to the position that was already determined at the first stage of setup, and by changing the position of the amplifier’s GAIN (Level) control, we find the level of the maximum possible (pure) signal amplification by the amplifier, without distortion , which this amplifier is capable of delivering. We again focus on the appearance of an audible transition to a frequency of 1 kHz (1000 Hz).
I remind you! Do not use sinusoidal signals for a long time to avoid mechanical damage to the speaker!!!
Now the Head Unit and the Amplifier are coordinated with each other. !!!
And the following happened.
Here is an example of a graph of distortion versus power. We see that up to 100 watts the distortion was within 0.01%, and after 100 watts there was a sharp jump upward. This is what we hear in the presented videos.
Next, we adjust the volume of the head unit to the maximum volume value without distortion, already in the agreed path.
Setting up the tweeter.
Tweeters, for the most part, are louder than midbass. More precisely, not even that. Due to the way they are installed and directed, they are louder. For this reason, we adjust their volume level to the midbass.
You can also use a sinusoidal track of 3149 Hz (disk track No. 50) for dome tweeters and a 6301Hz track (disk track No. 51) for horn tweeters. And using the method described above, we repeat the whole process. But without a complete understanding of the process (what we ultimately do), the tweeters may fail to work! Since the maximum signal distortion, as a rule, occurs within their range.
To tune dome tweeters, set a second-order filter in the region of 2.5 - 3 kHz, and for horn tweeters, set a second-order filter in the region of 5-6 kHz. To avoid damaging the tweeters.
Setting up the subwoofer.
We take a 40 Hz sinusoidal track (track No. 46 on the disk) and use the method described above for midbass to match the sub amplifier with the head unit.
If you have additional equipment, it is possible to coordinate without sound.
An example of such a setting:
1 kHz sine distortion 0,03% link to listen
Http://music.privet.ru/user/eterskov/file/310328286?backurl=http://music.privet.ru/user/eterskov/album/310327806

Date: 08/26/2013, 15:03

We invite you to consider several options on how you can easily configure the amplifier, depending on its purpose at one time or another. Let's do this using the four-channel amplifier Blaupunkt GTA-475 series as an example. Do not forget that no matter what methods of adjusting such amplifiers you use, their meaning is still the same. For example, instead of smoothly adjusting the cut using the so-called “twist”, you can use a fixed switch.

The front control panel of the amplifier has a line piercing the upper controls, on which you can see the inscription FRONT. This means that these adjustments are used to adjust the front (front) channels, adjust the REAL, and also adjust the channels to which the subwoofer or rear speakers are connected (rear).

Now is the time to learn how to set up an amplifier in a four-speaker system without including a subwoofer. It is easiest to configure this system, since the amplifier filter is already turned off, and the speakers reproduce absolutely the entire possible frequency range. Set the switches to the appropriate positions:

Set the LEVEL switch to position 8V (front and rear);
- set CROSSOVER SELEKTOR to the FLAT position (front and rear);
- set the BASS BOOST switch to 0dB (front and rear).

After the work has been done, set the volume on the radio to about 80-90%. Why not 100%? Yes, because we need a power reserve, due to the fact that some compositions are played very loudly, others normally, and others very quietly. The task would be simplified if the equalizer of the radio was already configured. If not, then set all the sliders to zero. You can also select from the list of proposed settings one of the options that suits you best (POP, DANCE, CLASSIC, ROCK, etc.). Then, turning on the music, slowly turn the LEVEL control to the right to the maximum value. At the same time, we make sure that the sound is as clear as possible and loud enough. If there is not enough power, then you can add more BASS BOOST.

The following instructions are for setting up an amplifier for speakers and a subwoofer. Let's assume we are dealing with regular speakers that are connected to the front channels. There is no rear subwoofer here. Let's get started. We set the switches one by one to the appropriate positions:

We set the FRONT switch to the HP position, while the FI PASS regulator should be in the range of 70 - 90Hz;
- set the REAL switch to the LP position, while the LOW PASS type regulator should be in the range of 60 - 80Hz;
- set the LEVEL switch to 0 (8V to the front and rear);
- set the BASS BOOST switch to 0dB (front and rear).

We adjust the sensitivity of LEVEL and BASS BOOST, as in the above example, but to our own taste.

And finally, let's start setting up the amplifier with channel amplification. Typically, such amplification is applied only to the front speakers. Then the tweeters and speakers (midbass) are amplified separately. Subtleties of this type of setting:

Set the CROSSOVER SELEKTOR switch to the FLAT position;
- turn on HP, and set the HI PASS control to the 250Hz position.

Using advanced head units (radio tape recorders), the above mentioned methods for adjusting amplifiers may not be applicable. The thing is that the radio itself is already capable of filtering all frequencies, and adjusting BASS BOOST is not difficult. All that remains is to set the LEVEL on the amplifier to a position suitable for each.

How to connect a subwoofer to a 4 channel amplifier

How to connect a subwoofer to a 4-channel amplifier without losing power? What needs to be done so that the connection diagram of a subwoofer to a 4-channel amplifier is fully and correctly implemented?
All these questions require answers, which we will try to provide in the article.

What is an amplifier for?

The audio system, as you know, has long been of interest to the driver. If earlier more attention was paid to the chassis or technical serviceability of the vehicle, today, on the contrary, it is to comfort.
And car audio occupies one of the leading positions in this regard. In order for the audio system to play at full power, recently they have introduced a separate speaker that reproduces low frequencies.
It is connected through an amplifier. Today there are three types of amplifiers installed in a car.

Note. The amplifier is installed in the car so that the driver and his passengers can fully enjoy the sound of music or watching a movie or video. For this reason, a properly selected and installed amplifier is of great benefit.

Of the above types of amplifier, 4-channel is considered the most popular, because it can be used for both 4 and 2 speakers, as well as a subwoofer.

In addition, the 4-channel amplifier can be used to connect 2 subwoofers.

Note. The best and most widespread manufacturers of high-quality 4-channel amplifiers are considered to be models from the brands Alpin, Blaupunkt, Magnat, etc.

A 4-channel amplifier can be of two more classes:
AV amplifier (see), that is, analog, with high amplification quality, but low efficiency and low power;

D is a digital amplifier, already with high efficiency and high power, but low quality.

Connector groups
A 4-channel amplifier has not one, but several groups of outputs.

Let's look at them in more detail:
Power connectors or outputs for power supplies.
12 V outputs, which are powered by the battery. When connecting wires to these contacts, it is recommended to also install a fuse at a remote distance from the battery.
REM output, where the control cable from the head unit is connected.
Output 1.3 GND or simply grounding. Designed to be connected to the machine ground.
Inputs for speakers and subwoofers, with plus/minus contacts.