For audio, good sound quality is also very important, because the lack of real natural texture will lose the most authentic quality. Here is how to improve the sound quality of the sound system for your reference, hoping to help friends in need.
How to improve the playback sound quality of sound system
1. Tighten the screws that secure the speakers in the sound box.
Due to long-term use, the screws for fastening the horn may be loosened due to frequent impact and vibration of sound waves. Therefore, you can carefully remove the mask on the front panel of the speaker and tighten the screws that fix the speaker one by one with a small screwdriver.
Note: It is best to use a small screwdriver without magnetism. In addition, when tightening the screw, don't use too much force to avoid the screw slipping.
Usually, after the screws of the speakers are tightened one by one, the clarity of the midrange will be improved and the resolution will be improved when playing back music.
2. Try to make the cables cross 90.
Audio equipment must be connected by signal wire, speaker wire and digital wire, and each equipment must be connected by power cord. So there are often many wires behind the stereo cabinet. It is inevitable that these wires do not cross, which creates a feeling and interferes with the music playing. In order to avoid and reduce induction, try to make these lines non-parallel and try to open the distance between them. When intersection cannot be avoided, try to do 90 orthogonal intersection.
3. Clean the contacts regularly.
No matter the signal line, horn line or power line, the joint between plug and socket will be gray or oxidized in the financial contact area because of long time. Therefore, in order to ensure good contact, it is necessary to pull out these connecting cables regularly (for example, half a year or a year) and wipe the contact surface with cotton and industrial anhydrous alcohol or special cleaning agent. Of course, there is a simpler way, that is, plug these plugs in and out several times to wipe off dust or oxides and blow them away.
4. Don't listen to music under the fluorescent light.
Because lighting equipment such as fluorescent lamps will make the power supply flicker and produce noise. So, don't listen to music under the irradiation of fluorescent lamps.
5. Try to absorb the reflection of the side wall.
If possible, try to hang a small decorative blanket or similar sound-absorbing material on the side wall between the speaker and the listening point to reduce sound pollution and improve the sound field.
6. Adjust the position of the speaker
The placement of speakers has a very important influence on the sound quality of playback. However, it is very likely that the speaker is not in the best position. Therefore, when listening to music, try to change the position of the speakers slightly, so that the two speakers move the same small distance back and forth, left and right, and the inner buckle angles of the two speakers are equal.
Usually just changing the position of the speaker will change the balance of some tones and even affect the collection of audio and video.
7. Improve the shock absorption of equipment.
If possible, it's best to put all the audio equipment on a special sound frame that is relatively solid and has good shock absorption. In addition, in order to further reduce vibration, shock absorbers such as financial or wooden shock-absorbing corner nails can be installed under each device.
8. Turn off the display of the audio device panel.
Some audio devices are specially designed to turn off the display screen on the front panel when in use. The reason is that the display screen will produce harmful radiation interference and make the sound of playing music worse.
9. Short-circuit the input of the unused preamplifier.
The input of the preamplifier may pick up some noise. Therefore, if these inputs can be short-circuited (grounded), noise will not enter the channel of audio signals. If the power amplifier uses balanced and unbalanced inputs and uses unbalanced input terminals. Then, you need to short the unused 1 and 2 terminals of XLR socket with "U-shaped short circuit piece". Of course, special XLR short-circuit plugs can also be used.
10. Equipped with high-quality double-wire short-circuit pieces.
If the speaker can be connected by two wires, and the speaker originally equipped for use is just a very common short circuit piece. Then, if possible, it should be replaced by an advanced "two-wire short circuit piece" like Cardas. Cadas's double-wire short circuit piece is not only made of pure copper, but also plated with rhodium.
1 1. Move the listening position slightly.
This can adjust the balance of bass. The reason is that the audio equipment placed indoors will produce some harmful standing waves, which will make the bass form quite strong sound pressure in some places and quite low sound pressure in some places. If you can move the listening position forward or backward a little, say 3 ~ 5 cm, the distribution of standing waves will change, thus improving the tone balance.
12. Replace the original power cord.
Although the original power cord of audio equipment can be used, it is not high-grade goods. As long as conditions permit, it should be replaced by a dedicated power cord dedicated to Hi-Fi equipment.
13. Turn off other digital audio devices when playing LP records.
Although analog sound sources such as LP records and turntables sound particularly pleasing to the ear, they will be disturbed by noise. Digital audio devices such as CD players, digital-to-analog converters and multi-output converters will generate and radiate some noise. In particular, even if some equipment is turned off, it will still radiate some interference. Therefore, in order to make the output of low-level LP discs unaffected by these radiated noises and listen to LP records in a clean background, we should turn off the power supply of all digital audio devices or even unplug their power cords.
What are the problems easily overlooked in the sound system?
First, some new speakers need to be used for a period of time before they can exert their excellent performance. This is called "guarantee". Otherwise, its playback sound will be too hard, too bright or too tight. This time process will be very different for different speakers, ranging from dozens of hours to dozens of days.
Secondly, due to physical factors, the bass dynamic range of the small bookshelf speaker cannot be too large, so even if its bass expansion is very low, it is of little practical significance. It can be seen that the pursuit of low frequency limit by small bookshelf speakers may not be ideal, and it is not suitable for the playback of sudden music.
Three, the speaker's nominal impedance is generally 4 Ω and 8 Ω. Although the loudspeaker with 4 Ω impedance can make the power amplifier output more power, the output current capacity of the power amplifier is required to be higher under the condition of low impedance, which often leads to the increase of distortion of some power amplifiers with small power supply margin, and the poor damping of low impedance speakers will affect the low frequency control. In addition, in practical work, the impedance of some speakers may be reduced to less than half at some frequencies, so it is best to choose a speaker with an impedance of 8 Ω. (For example, the load impedance of many AV amplifiers cannot be lower than 6 Ω)
Fourthly, although the sound box of small-caliber speaker unit can achieve very good listening effect, this kind of sound box is only suitable for close listening. For a room with a relatively large space, such as a hall, it is necessary to choose a large speaker with a large caliber speaker unit to achieve good listening effect.
5. Dumbbell loudspeaker adopts two identical medium and low frequency loudspeaker units, which are symmetrically arranged on both sides of the high frequency unit, and can realize better low frequency and transient response, higher sensitivity and power tolerance, and smaller large dynamic nonlinear distortion. However, the comprehensive frequency characteristics of the middle tone often produce valley value, and the vertical directivity is narrow, so we should pay attention to the middle tone performance. In some dumbbell-shaped speakers, the lower unit is only used to play back low frequencies, and the upper unit plays back middle and low frequencies, which is called 2.5 frequency division, so the above shortcomings can be overcome.
Six, two-wire speaker, with two groups of speaker terminals, such as ordinary connection, two groups of terminals in parallel, then the speaker cable must be connected to the low-frequency unit that a pair of terminals, otherwise due to the influence of two groups of terminals in parallel or copper, the effect of low-frequency playback will be mostly lost.
Seven, floor speakers are placed on the ground, but often because of the ground vibration and affect the balance of playback sound, and even cause bass rumbling, so in most cases, foot nails are indispensable. Most of the speakers on the base need a tripod with a suitable height, which can be placed on tables and cabinets at will. Due to the reflection of sound waves, the playback characteristics of speakers often change. For the sound box with mirror symmetry design of high-frequency unit (that is, the high-frequency unit is not in the center of the sound insulation board), the high-frequency unit should be biased to the inside when setting.
Eight, between the speaker and the tripod, it is best to use three small pieces of foam double-sided tape to stick at the bottom of the speaker in a triangular position, and then put it on the tripod, so that the speaker and the tripod have a certain adhesion. Otherwise, if you accidentally bring it to the speaker in use, the speaker will easily slip off the tripod and fall to the ground and be damaged.
Nine, the sound outlet is set on the back baffle of the bass reflex speaker, and its distance from the back wall must be adjusted to achieve normal and reasonable low-frequency performance. Too close will generally produce too many or ambiguous sounds, and too far may make the low frequency insufficient. Speakers with sound holes in the front grille can be placed on low cabinets without worrying about reflection holes.
X. Speakers are easily influenced by the acoustic characteristics and placement of the room. The sound effect will be different when the speakers are placed in different spatial environments. Even if the same speaker has the same frequency response through the balanced playback system, its sound reproduction effect will be different as long as the room size is different.
How to improve the bass effect of speaker with power amplifier
It depends on whether the bass is insufficient because of the insufficient power of the amplifier or the problem of the speaker.
If it is caused by insufficient power of the power amplifier, a filter capacitor with large fixed capacity can be installed in a suitable standby position, and then the welded CBB electrodeless capacitor can be led out, but the original filter capacitor is best connected in parallel with 0. 1 microfarad, which can improve the anti-high frequency interference effect. The power supply of power amplifier is usually positive and negative dual power supply, pay attention to the wrong polarity.
If it is a problem with the speaker, you can install reinforced wooden strips in the box, lay sound-absorbing cotton, adjust the capacitance of the frequency divider, or replace the woofer to improve the bass effect.
The following are sorted by effect:
The most direct thing is to upgrade and change boxes.
The second is to change the speaker, after all, the speaker is the biggest influence on the sound.
If the design of the frequency divider is unreasonable, the effect of adjusting the frequency divider is extremely significant.
Replace it with a transformer with better quality and more power.
Replace two high-quality filter capacitors (note that this capacitor has a great influence on timbre, so you need to choose one that suits your ears. We recommend two high-priced ones: ELNA with high intermediate frequency and neutral flat sound.
Change the operational amplifier, as everyone said. Just choose according to your own needs. It is not recommended to change it to Cheng Gui, which is not worth ten yuan.
It is generally not recommended to replace the power supply manifold block, such as upgrading from 2030 to 1875. After all, even the cheapest 2030 has a good sound, and it is a waste to change the integrated block without increasing the power of the transformer.
Exchange coupling capacitance and decoupling capacitance
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The best effect of sound adjustment
Sound quality is mainly determined by sound source and line performance.
1. If the preceding stage uses a multiband equalizer, the low frequency below 250HZ should be about 6db, the 500HZ-6KHZ should be about 3db, and the high frequency band should be 16khz.
2. If the negative feedback tone is bass at 4 o'clock, alto at 2 o'clock and treble at 5 o'clock.
3. The line of sight performance, sound source, speakers and other factors.
Related instructions
The combination of combined audio is called audio host. This host generally has a power amplifier circuit, including radio, cd, tape drive, and even MD. , and often the overall design. Audio amplifier generally refers to a single-function amplifier. Individual audio amplifiers are basically high-powered. At present, mono is usually 50w~ 100w and above.
Active audio refers to a speaker with a built-in power amplifier. Passive audio means that there is no internal power amplifier, and it can only work if it is connected with an external power amplifier. 2.0 is 1 left channel and 1 right channel, so there are two speakers. 2. 1 is a subwoofer based on 2.0. Because the bass has no directionality, it can be played anywhere. 3. 1 is one.