For the loudspeaker plays exactly sound after just buying, you must let speaker run slowly in a time and connect cables accurately. If the sound is still not good, you can open a plank covering and increase the mid and treble volume.
 

        
Running slowly in a time not meaning let speaker play continuously. Photos: Cache.
   

This is the first step that any music player also has to try when buying new speaker. Similar to a motor, a speaker also needs to be running slowly in a time because specifications inside sub speaker, especially the film and rubber piece of a new speaker is still hard. It is the physical characteristics cause film move in a lack of flexibility, listening sound is single, not melodious and soft. In particular, woofer speaker (bass speaker) is the drivers in which the size of film is large and the weight is more significant than mid or treble speaker. Although after a period of using, the rubber piece and other mattress parts will be soft and the speaker will show its correct sound quality. But, nobody wants to hear bad sounds in a long time, so the only way to resolve those speakers is running slowly in a time.

Running slowly in a time dose not mean let speaker play continuously that it needs technologies so that the running time is shortest and most effective. You must put two speakers opposite each other, connecting ampli with each speaker in accordance with phase (pole), the rest speaker will be connected to opposite phase (anode of speaker connects to negative pale of ampli, and vice versa, cathode of speaker connects to positive pale of ampli) . For the best, you should choose the type of CD rock in which bass is so much or CD pro for speaker to run. With this way, only after two to three days, a new pair of speakers was "run" quite well. The next thing is to arrange speaker in the previous position. Please note that we do not adjust volume in too high level during the running. 

        
Connect bi-wire. Photo: Hometheaterhifi.    

To use bi-wire connection, your speaker should be installed bi-wire device, including four speaker pales at the behind each of speaker. Those pales are linked together into each two pairs by a metal bar, often called a bridge. When connecting bi-wire, you need to prepare a pair of bi-wire speaker cable in which two ones connecting to ampli and four ones connecting to speaker or use two single pairs of speaker cable. Please shall make sure that the power supply of the system was turned off. The connection is quite simple; you remove 2 bridge bars, connect to all four speaker pales and then connecting ampli, please note that speaker pales must match. When using two single pairs of wire cable, the connector of ampli must be formatted as crab so that we can integrate two cables in a pole of ampli. In case of speaker having three sound lines and the support of tri-wire connection (including 6 connector pales in each speaker), can separate the tri-wire or three pairs of normal core wire. When using tri-wire connector, the sub speaker’s system will work independently or divided into two or three branches of bass, mid/treble or bass, mid, treble. The feelings of the details (crack sound), the movement at high level, and the balance long sound will make you surprise.
Increasing the weight and using more metal base (skipe/cone) help speaker be improved on sound quality.

        
Von Schweikert VR3 speaker. Photo: Stereotimes.
  

One of the tips is quite or very well and also is a basic way is to increase the weight of the speaker. The increased weight means a stable vibration and reducing correct languages, especially improving bass sound. In some speaker models, the manufacturer also designed the open space so you can add other materials such as sand, stone ... in order to increase the basic weight. For example, the pair of speaker Von Schweikert VR3 (about USD 2,000), the sub speaker system is stabilized by an empty space, you can put more sand or lead to it, after using many lead bullets and compressed-air guns to fill up the open space, bass sound of the speaker will become firmer and stronger, mid and treble sound is clear. However, if you own a pair of normal speaker, you can still use granite stones 300 x 300 mm, thickness 20 - 30 mm to the put under the base. Right on top of speaker box, you can also add a stone similar to this. For anti-scratch, you should prepare thin piece of cloths and put it between the surface of box and stones. In addition, for removing vibration sounds and bringing bass sounds with a clear and strong, we can equip more of the metal set (if speaker does not have). Currently, some hi-fi shops also sell the metal set from oversea or self-processed from copper, etc. 
        
Simply, to open the plank covering speaker

Photo: Homecinema.   

Open the plank covering speaker when start enjoying music, which very few people pay attention to and it is also very simple to help you improve your sound. Sound wave is broadcasted directly to listener’s ears without any obstacles, even smallest ones, helping listener enjoy music in high-level maximum details. And this plank also helps us prevent dust and the naughty of kids.

Increase mid and treble volume 

        
Increase mid and treble volume if necessary. Photo: Ptvsystem.     

We can increase the volume of mid dome or treble speaker by adding a self-made horn. It can be made from wood or composite horn. This is the method used is quite popular with the audiophile world. However, using more horn will reduce the opening level of long-audio, good listening areas will be narrower.

With treble speakers, if not using added horn, we can open the machine and move the speaker to front from one to several cm, the crack between speaker and box will be inserted more wooden plank or rubber.

Resolving noisy sounds due to the phenomenon of down cone speaker, also called out of the center. 

        
Cone speaker. Photo: Timeelect.     

Due to the impact of gravity, after a period of activity, voice coil of speaker is out of the center. Some cases go down to touch a pole of magnet causes the sound is cracked very uncomfortable. The way of efficient resolving without having to repair or replace sub speaker is to rotate 180 degree; gravity will impact on voice coil and drag speaker return to the center position. In some cases, the voice coil is out of too far and the surrounding wire scroll is strongly affected by a magnet, the above way will not be improved. At that time, you can ask workers to repair voice coil or it is forced to change the new speaker.

(According to Audio-Visual)