For the matching problem between the amplifier and the sound, in addition to the soft matching of the sound (the sound is often said to be soft and hard, it is based on the designer's design and materials for the tone, but has the characteristics and personality) and some techniques. A hard match on the indicator. Soft collocation is based on experience accumulation and personal hobbies. The hard collocation is determined by data and basic technical common sense. The following is a brief description of the problems related to hard collocation. Screw Terminal Block,Screw Terminal,Screw Terminal Connector,Pcb Screw Terminal Cixi Zhongyi Electronics Factory , https://www.cx-zhongyi.com
Impedance Matching 1. When the vacuum tube amplifier (amplifier) ​​is matched with the speaker, the output impedance of the amplifier should be equal to the impedance of the speaker, otherwise the output power and distortion will be reduced. Fortunately, most of the amplifiers have variable output impedance matching interfaces such as 4-8-16 ohms, and the impedance matching with the speakers has become simpler.
2. For the matching of transistor amplifier (rock machine) and speaker impedance A) When the speaker impedance is higher than the output impedance of the amplifier, there is no other effect except the output power is reduced to different degrees.
B) When the impedance of the speaker is lower than the output impedance of the power amplifier, the output power is proportionally increased, and the distortion is generally not increased or increased a little. However, the impedance of the speaker should not be too low when matching, such as as low as 2 ohms (when 2 4 ohm speakers are connected in parallel), at this time only the power of the power amplifier is large, and the high-power tube and multi-tube parallel push-pull with good performance are used. Generally, there is no impact on such a power amplifier. On the contrary, the general power amplifier is not rich, but the pcm and lcm of the power amplifier tube are not large. When the volume is turned on, the distortion will increase significantly, and the serious opportunity will destroy the box and pay attention.
Power matching 1. In principle, when the rated power of the speaker is inconsistent with the rated power of the power amplifier, for the power amplifier, its power is only related to the impedance of the speaker, and has nothing to do with the rated power of the speaker. No matter whether the power of the speaker and the power of the power amplifier are the same, it has no effect on the work of the power amplifier, but it is only related to the safety of the sound box itself.
2. If the impedance of the speaker meets the matching requirements and the power is less than the power of the amplifier, the power is sufficient and it sounds very comfortable. This is often said that the power reserve of the power amplifier should be large, in order to fully express the full connotation of music, especially the low frequency part of music, the performance is more vivid and powerful. This is a good match.
3. If the rated impedance of the speaker is greater than the rated power of the amplifier, although both can work safely, the power amplifier does not have enough power to drive the power amplifier. It will feel insufficient loudness, and it often appears to be saturated, and the distortion is intensified. The power is not in the heart. This is a poor match.
According to the damping coefficient matching, for the selection of a pair of Hi-Fi speakers, there should be the best specific resistance requirements. (Responsible speaker manufacturers should provide this data, referring to the requirements of the damping coefficient of the power amplifier. If you want to match this speaker, you need to have the damping coefficient of the power amplifier to be achieved. Under normal circumstances, the damping coefficient of the power amplifier is a little higher. When the damping coefficient of the low-level power amplifier is less than 10, the low-frequency characteristics, output characteristics, and high-order harmonic characteristics of the speaker will deteriorate. (The damping of household amplifiers is generally between tens and hundreds.)
The matching line of wire and wire is a total of 10,000 yuan, and the next is also thousands to thousands of dollars. (Of course, there are also less than one hundred yuan.) The effect is a matter of opinion. Good wire will generally improve some of the deficiencies in audio equipment. Its transmission theory is too complicated to say and can only be described briefly. The material and structure of the transmission line determine three important parameters, namely resistance, capacitance, inductance (also electromagnetic effect, skin effect, proximity effect, reactance, etc.). If you look at the small gap between these parameters, it will directly affect the audio system frequency. Features, damping characteristics, signal rate, phase accuracy, and tone orientation and sound field localization. Its main role is high-speed transmission (to minimize signal loss), anti-vibration, anti-noise, anti-interference (mainly radio wave RFI radio frequency interference and EMI electromagnetic interference, etc.)
February 05, 2023