Time domain characteristics are very important indicators of loudspeaker systems, and many professional terms for evaluating the sound performance of loudspeaker systems are related to them, such as: transient response, layering, clarity, sound field localization, and so on. For the time domain characteristics, engineers in the electroacoustic industry have conducted a lot of research earlier, but it is only qualitative analysis and some assumptions, and even the authoritative American electroacoustic test system LMS does not have the test function of time domain characteristics.

With the rapid development of computer technology, the time domain characteristics of the speaker system can now be quantitatively tested and analyzed, and the test system now includes DAAS in West Germany, LAUD in the United States, and most of our domestic test instruments are available.

The test of time domain characteristics has high requirements for the test environment, and the test results of the computer test system in the free environment can only be used as a reference!
The time domain characteristics mainly include the following aspects.
First, step response Step response
, which is often called transient, refers to the speed of the speaker system to the feeding signal to follow the speed, of course, the faster the better, and can also respond sensitively to weak signals.

The transient response index of the speaker system is related to many factors, and the cabinet speaker unit and crossover circuits and components, and even wiring have an impact on it. Speaker system with good transient characteristics" Move like the wind, still as a bell" , can accurately and faithfully reflect the instantaneous changes in audio signals, audiophiles are looking for " Detailed" In fact, it is a pursuit of the transient characteristics of the speaker.
Transient is speed, and the factors that affect speed are not only the speaker system, the sound source, but also the amplifier; The speed at which silver and copper wires transfer audio current is also very different (not just the difference in resistance values).
The same copper wire is divided into brass wire (copper aluminum alloy), copper wire (pure copper wire), multi-N copper wire (N is the first letter of English 9, such as 6N means copper content of 99.9999%), single crystal copper wire, single stranded wire, multi-strand wire, and even multi-stranded special stranding method line, various, difficult to say.

All this is to make a fuss about speed and timbre (speed will determine the main component of timbre), the speed of the gallbladder machine to the stone machine has become faster, the speed from analog circuit to digital circuit is faster again, the speed of the silver wire cannot catch up with the so-called carbon fiber wire without internal resistance, the transmission of the cable will of course be half a beat slower than the optical fiber, how fast is it? Today, digital circuits are very advanced, and some people stand up and say: " The digital taste is not good, and the old antique bile machine is much more enjoyable (the bile machine is slower). " The public says that the public is reasonable, the mother-in-law says that the mother-in-law is reasonable, the sound is really fun!

There is actually no need to argue about whether the equipment is fast or slow, as long as what you like is good. But for the speaker system, the author personally prefers a faster, perhaps a " Occupational diseases" , pay more attention to test indicators, the kind of " that a few people agree with; Very music" But speaker systems with poor time domain characteristics disagree.

This so-called very musical thing may have a special feeling of listening to a few slow songs, but whether the comprehensive performance can pass the level is a question mark.

Music is infinite, don't simply divide what strings, percussion, brass, vocals, symphonies..., all the peoples of the world have their own music, what is " I think it's better to honestly do a good job of electroacoustic indicators, faithfully restore the feed-in signal, quickly open the sound if there is a signal, shut up immediately if there is no signal, and it is good without personality. The primary cause affecting the transient of the speaker system is damping, which includes the resistance and mechanical damping of the speaker unit, the resistance of the crossover network, the sound damping of the box, and even the damping of the propagation medium (experienced readers may have the feeling that the sound of the same equipment will change slightly in the state of different air humidity on sunny days and rainy days).

Low damping speaker system is currently an international popular practice, analyzing many internationally renowned speaker systems, it is not difficult to see that the masters are making a lot of articles to reduce damping in order to improve the transient response of the speaker system!

Denmark's Weifa speaker factory has several new units that use copper short-circuit ring structure, the purpose is to improve the high-frequency impedance of the unit, in fact, it is also to reduce the resistance nide, of which the tweeter with a bullet (forget what model, the small cyclone has been used in high-end products) is one of the masterpieces; PMC's famous octopus woofer uses PU material as a hanging edge to reduce damping, readers and friends if they are interested in listening, the transient response of low frequencies is really good, listening to drums is very enjoyable; After the rain, several famous boxes are designed as short inverted tubes (only about 2cm), which effectively reduce sound resistance and obtain excellent transient characteristics, of course, there are unit low-damping PP material sound cones, low-damping butyl rubber overhangs are also very helpful, readers can also go to listen, the original high transient response speaker system is so fidelity and expressive.