Part 1. Impedance matching
1. When the vacuum tube amplifier (tube 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 will be reduced and distortion will increase. Fortunately, most amplifiers have variable output impedance matching interfaces such as 4-8-16 ohms, and impedance matching with speakers has become simpler.
2. For the matching of transistor power amplifier (stone machine) and speaker impedance
A) When the speaker impedance is higher than the output impedance of the power amplifier, there is no other effect except for the different degree of reduction of the output power.
B) When the speaker impedance is lower than the output impedance of the power amplifier, the output power increases proportionally, and the distortion generally does not increase or the increase is negligible. However, the speaker impedance cannot be too low when matching, such as as low as 2 ohms (referring to when two 4-ohm speakers are connected in parallel). At this time, only the power amplifier has a large amount of power, and the high-power tube and multi-tube parallel push-pull with good performance are used. , Generally has no effect on such power amplifiers. On the contrary, ordinary power amplifiers are not rich, and the pcm and lcm of the power amplifier tubes are not large. When the volume is turned on again, the distortion will increase significantly, and the box will be destroyed in serious cases. Pay attention.
Part 2:Power matching
1. In principle, when the speaker's rated power is inconsistent with the power amplifier's rated power, for the power amplifier, its power is only related to the speaker impedance, and has nothing to do with the speaker's rated power. Regardless of whether the speaker power is the same as the power amplifier power, it has no effect on the work of the power amplifier, but is only related to the safety of the speaker itself.
2. If the speaker impedance meets the matching requirements, and the withstand power is less than the power of the amplifier, then the driving power is sufficient, which sounds very comfortable. This is often said that the reserve power of the power amplifier must be large in order to fully express the full content of the music, especially the low frequency part of the music, which 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 power amplifier, although both can work safely, at this time the power amplifier is not enough to drive the power, and the loudness will be insufficient. Often the speaker has been turned on to a saturated state, and the distortion is aggravated. Powerless. This is a poor match.
Part 3:Match according to damping coefficient
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, which refers to the requirements for the damping coefficient of the power amplifier. To make it clear is to match this For speakers, what is the damping coefficient of the power amplifier required?). In general, it is better for the damping coefficient of the power amplifier to be higher. When the damping coefficient of the low-end power amplifier is less than 10, the low-frequency characteristics, output characteristics, and high-order harmonic characteristics of the speaker will be deteriorated. (The damping number of household power amplifiers is generally between tens to hundreds.)
Part 4:Matching of wires
There are many fever lines, which cost more than 10,000 yuan, followed by a thousand to several thousand yuan (of course, there are also less than one hundred yuan). The effect of using it is a matter of opinion. A good wire will generally improve some of the deficiencies in audio equipment. Its transmission theory is too complicated to say, it can only be briefly described. The material and structure of the transmission line determine three important parameters, namely resistance, capacitance, inductance (and electromagnetic effect, skin effect, proximity effect, reactance, etc.). Don`t look at the small gaps in these parameters, which will directly affect the audio system frequency. Characteristics, damping characteristics, signal rate, phase accuracy, and tone color orientation and sound field positioning, etc. Its main function is high-speed transmission (to minimize signal loss), anti-vibration, anti-noise, anti-interference (mainly radio wave RFI radio frequency interference and EMI electromagnetic wave interference, etc.).
All right, above 4 parts are the some points need to notice, we XDEC speaker hope everyone can choose a good quality speaker and a good match power amplifier, then real music joyce come out !