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Ten details to pay attention to when playing with speakers

2021-10-04 38
For music lovers, they have a complete set of their own sound system, and the speaker system-speakers, play a decisive role in the quality of the replay sound, so when choosing speakers, they will take great pains, but apart from comparing the speaker technology In addition to the indicators and listening evaluation, there are some issues about speakers that are usually overlooked by people, but they have a lot to do with the replay sound effect.

1. Some new speakers need to be used for a period of time before they can exert their excellent performance. This is the so-called "boiler". Otherwise, its playback sound will appear hard and overly bright, or it will be too tight to let go. This time course can vary greatly for different speakers, ranging from tens of hours to tens of days.

2. The small bookshelf speaker is limited by physical factors, its bass dynamic range cannot be too large, so even if its low frequency extension is very low, its practical significance is not great. It can be seen that the pursuit of the lower limit of the low frequency of the small speaker, the actual effect I'm afraid it's hard to be ideal, and it's not suitable for replay of bursting music.

Three, the nominal impedance of the speaker is usually 4Ω and 8Ω. The 4Ω impedance speaker can make the power amplifier output more power, but because the impedance is low, the output current capacity of the power amplifier is required to be high. Some power amplifiers with small power supply margins tend to increase distortion, and low-impedance speakers are unfavorable for damping, which will affect low-frequency control. In addition, the impedance of some speakers may be reduced to less than half of the value at certain frequencies during actual work, so it is best to choose a speaker with an impedance of 8Ω. (For example, the load impedance of many AV amplifiers cannot be lower than 6Ω)

4. Although the speakers of the small-diameter speaker unit can achieve very good listening effects, this kind of speakers is only suitable for close listening. For a room with a larger space, such as a hall for sound reproduction, a large speaker with a larger-diameter speaker unit should be selected to achieve a good listening effect.

5. Dumbbell speakers use two identical mid- and low-frequency speaker units with a symmetrical layout on both sides of the high-frequency unit, which can achieve better low-frequency and transient response, higher sensitivity and power tolerance, and large dynamic nonlinear distortion. It is small, but its mid-band comprehensive frequency characteristics tend to produce troughs, and the vertical directionality is narrow, so its mid-range performance should be paid attention to. However, the lower unit of some dumbbell speakers is only used to reproduce the low frequency, and the upper unit reproduces the middle and low frequencies, the so-called 2.5 frequency division. The above shortcomings can be overcome.

 

Ten details to pay attention to when playing with speakers


Six. Two-wire split speakers have two sets of speaker binding posts. If they are connected in common, the two sets of binding posts are connected in parallel. At this time, the speaker wire must be connected to the pair of binding posts in the low-frequency unit, otherwise due to the two sets of binding posts. The effect of low-frequency replay is mostly lost due to the connection or copper used in parallel.
 
7. Acoustic speakers are placed on the ground, but the resonance of the ground often affects the balance of the replayed sound, and even causes the bass to blast. Therefore, in most cases, foot studs are indispensable. Most of the stand speakers need to be equipped with a pair of feet with a suitable height, which can be placed on the table or cabinet at will. Due to the reflection of sound waves, the playback characteristics of the speakers will often change. For speakers with a mirror symmetry design for the high-frequency unit (that is, the high-frequency unit is not in the middle of the baffle), the high-frequency unit should be tilted to the inside when placed.

8. Between the speaker and the tripod, it is best to use three small pieces of foam double-sided tape, stick it on the bottom of the speaker in a triangular position, and then put it on the tripod, so that the speaker has a certain adhesion between the tripod. Otherwise, if the speaker is accidentally brought to the speaker during use, the speaker will easily slip out of the tripod and fall to the ground and be damaged.

9. The distance between the bass reflex speaker and the rear baffle of the sound outlet must be adjusted to achieve normal and reasonable low-frequency performance. Too close, generally will produce too much low frequency or ambiguous sound, too far, may make the low frequency insufficient. The speaker with the sound outlet on the front baffle does not need to worry about the problem of the reflection hole, even if it is placed on a low cabinet.

10. The speakers are very susceptible to the acoustic characteristics of the room where they are placed and where they are placed. When the speaker is placed in different spatial environments, its sound effect will be different. Even if the same speaker has the same frequency response through the balanced playback system, as long as the room size is different, the sound effect will be different.
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