More and more audiophiles begin to fall in love at collocation gives can reflect oneself distinctive individual character and grade "golden combination acoustics". Most people don't have the analytical skills for each component, but there are plenty of opportunities for speakers and amplifiers.
Especially in the professional sound amplification field, the sound equipment configuration is very exquisite, among which the power amplifier and the sound box configuration are also the most important. Although the use of the speaker will recommend the user to some of the required power amplifier configuration, the user is often faced with many types of power amplifier or do not know how to begin. How to select the best power match between speaker and amplifier?
There are many aspects involved in the configuration of the amplifier and speakers, such as the amplifier brand, the type of power tube, and which amplifier should be configured for low sensitivity speakers. It is difficult to find a unified standard for the specific configuration of the amplifier and speakers, which is generally related to the designer's experience, hobbies, listening habits and other factors. Some users often assign a small power amplifier to the speaker to save money, while some users assign a large power amplifier to the speaker for what is called "full power reserve." Neither the pony (amplifier) pull car (speaker) nor the big horse-drawn trolley is appropriate, as this configuration can cause damage to the equipment. And in the power amplifier and speaker configuration, power amplifier is really the key.
From the technical aspect, the following points should be paid attention to in the power amplifier and speaker connection: power matching, power reserve quantity matching, impedance matching and damping coefficient matching. On the one hand, we should consider installing several sound box systems in the listening room. The simplest power amplifier only has 1-2 power outputs, and the simplest dual-channel stereo system can be configured. More complex power amplifier to be equipped with 4-6 power output. The maximum output power of the amplifier and the maximum bearing power of the speaker must be matched to prevent the speaker from burning accidentally.
At the same time, it should be paid attention to the data of the DampingFactor(DampingFactor) of an amplifier, which represents the control ability of an amplifier to the horn. The larger the data and the better the control ability, the better it is for the creation of high-quality sound.
In the human auditory domain of 20Hz ~ 20kHz, music signals with a real concentration of a large amount of energy are generally in the medium and low frequency bands, while the energy in the high frequency bands is only 1/10 of the energy in the medium and low frequency bands. As a result, the average speaker loses much less power to the treble than the woofer, in order to achieve a high-woofer balance; Modulator and the power amplifier is like a current, it under the control of the input audio signal, the output current for speakers of different size, make it happen voice of different size, under the certain condition of impedance, want to let the nominal power of 200 w power amplifier output of 400 w or several times is easy, just distortion (THD) of the power amplifier will be greatly increased, the distortion is mainly produce the high frequency harmonic in medium and low frequency signal, the greater the distortion, the greater the high frequency harmonic energy, and the high frequency distortion signals with high frequency music will together into the high head, This is why the large speaker with a small power amplifier will burn the treble head.
It is reported that the specific standard of power amplifier and speaker power configuration should be: under certain impedance conditions, power amplifier should be larger than speaker power, but not too large. The true power amplifier should be about 1.2-1.5 times of the rated power of the speaker in general application. In large dynamic situations, it should be about 1.5 to 2 times. With reference to this standard, it can not only ensure the power amplifier to work in the best state, but also guarantee the safety of the sound box. Even for inexperienced operators, as long as there is no serious error in operation or improper adjustment of front-level peripheral equipment, the sound box and power amplifier can work in a stable state.
However, if the power of the amplifier greatly exceeds the rated power of the speaker and the volume is high, the speaker will be burned, otherwise, the sound will be weakened, or the life of the amplifier will be shortened or even the amplifier will be burned.
The power amplifier and the power configuration of the speaker are also related to the target loudness. Under certain target loudness, music signal dynamics should be fully guaranteed on each device. If the power amplifier is too large, its gain setting is very small, and the loudness has reached the requirement, but at this time, the power amplifier's gain limits the dynamic range of the signal. Therefore, the power amplifier cannot be too large; Otherwise, it will not only waste the expense, but also bring the loudness and music dynamic can not be considered as well as the heavy load of the speaker. Generally, the signal fluctuation of the amplification field is small, and it does not require the amplifier to provide large current to the speaker for a long time or very soon. Therefore, the power of the amplifier should be smaller than that of the large dynamic amplification field which requires strong power. In addition, the so-called "power reserve" should also be targeted at the speaker. It is worth noting that the selection of the amplifier should be determined by the speaker, and the amplifier should not be configured with the concept of "power reserve".
In addition, the configuration of the speaker and amplifier is closely related to the sensitivity of the speaker, the highest required sound pressure and the performance of the amplifier. Generally speaking, the power of home audio system is more than enough, and the power of power amplifier on the market is more and more, mainly as a result of commercial behavior. A 2 x 100W power amplifier can output less than 1W when actually working. It is of course light and light for the equipment, with less distortion and no overheating. It is very beneficial for the manufacturer. It's just that users spend more on equipment and society consumes more resources.
When choosing power amplifier, want to have a comprehensive understanding to domestic environment and the sound equipment that matches with power amplifier photograph. See appearance design whether accords with him aesthetic requirement, whether the style photograph of the home environment is consistent. The carpet and curtains in the room will reduce the reflection of sound, and the wood floor will make the bass sound good. Many borne power amplifier has the power of 100 w x 2, but used in the family generally the volume is only about 1/5, 1/4, which is only about 10-30 w power, open up the ears will not only suffer mental agony, horn can't stand, and can make music distortion, so in a few square meters of family environment have 30 w power of "gold" stereo equipment is most appropriate.
However, it is best to be able to connect the amplifier and your own chosen sound box system to the field. If you can, bring a few of your own familiar high-quality CD testing machine, symphonic, piano, voice, string and other content should be complete, attention to sound quality, tone effect.
When listening to the low-frequency region, if the bass is muddy and messy, it is a manifestation of poor damping characteristics, large internal resistance of power supply, or poor circuit design. The middle frequency band can be identified by human voice and string music. The interpretation of human voice should be round and pleasant, the sound position should be stable and unchanged, and the middle frequency band of string should be full and strong, smooth and smooth. The pitch of the piano should be clear and powerful, and the string should be round and not hairy or harsh, otherwise there will be frequency distortion and interactive distortion. The development of an instrument from bass to treble should remain the same without moving left or right. When playing symphonies, it is necessary to have a certain expression on the playing scene, and to feel as many instrumental parts as possible spread out in front of you, which is a general requirement for sound amplification equipment.
[multiple principles] from a technical perspective, the following points should be noted for the power amplifier and speaker connection: power matching, power reserve quantity matching, impedance matching and damping coefficient matching.
[power matching] the specific standard of power amplifier and speaker power configuration should be: under certain impedance, the power amplifier should be larger than the speaker power, but not too large. The true power amplifier should be about 1.2-1.5 times of the rated power of the speaker in general application. In large dynamic situations, it should be about 1.5 to 2 times.
[target loudness] under a certain target loudness, the speaker can be larger than the design value for different purposes, while the power of the amplifier should be determined strictly by the speaker, without much flexibility.
[environmental factors] many power amplifiers have a power of about 100W x 2. However, when applied to families, the volume is only about 1/5-1/4, that is, the power is only about 10-30w. When the power is turned on, not only the ears will suffer, but the horn will also suffer, and music will be distorted.