« The future is bright for plumbers | Main | Interview with Sherry Brantley, author of "Best of Friends" »
Speaker – the cornerstone of the stereo system
By admin | January 29, 2010
Reinvention of the original sound of a live concert with the sound produced in a recording studio, probably the paradigm of high loyalty of fans. Most of the amount invested in expensive sound equipment, which promises a better and more realistic testing experience. But beyond the technical specifications and the quality of each component, the sound you hear is the result of a series connection of all components of the audio signal chain.
Thus, if the objectiveSound more natural and realistic as part of this chain must give more prominence and allocating more resources? There is a key element in this chain can greatly affect the final sound we observe? I think music lovers and most do not these issues objectively analyze and are misled by the advertising, design and technical specifications for audio equipment, not realizing that the last sound of the result of all chain and that eachstep in this chain must be consistent with the others in terms of quality and performance. The sound you hear will be just as good as the sound of the weakest link in this chain.
In simple terms, we see three stages in the chain of the audio signal to identify the signal (usually a CD), the amplification (pre-amp + power amp or integrated amp) and the final phase, signal transduction electric waves, the system speakers (or headphones). Some keytechnical concepts that are in the range of equipment which allows us to compare are: the frequency response, signal to noise ratio (S / N), total harmonic distortion (THD), estimated capacity and efficiency.
The frequency response is the bandwidth that the device does not respond in a linear fashion, and must be greater or at least equivalent to the human audible range is from 20 Hz to 20,000 Hz. S / N is the percentage of clean signal (music) inReferring to the background noise: while this percentage is higher among the better the signal cleaner. Harmonic distortion is the level of harmonics introduced by the rats, which distorts the original input signal (music). THD at low sound more pure and means that the equipment is of high quality. You must believe that the man on the harmonic distortion, when the proceeds of pure sine tone with a distortion is higher than the 0.1% observed. If the sound isthe music is impossible to notice the distortion due to the complexity and confusion of sounds that are involved.
For the first phase of the audio chain, the signal of good quality, and the average price, CD player and in general the following characteristics: flat rate of 10 Hz to 20 kHz to 0.5 dB, S / N larger than 90 dB and THD less than 0.05%. The difference between the brands and models are usually located in the quality of their circuits for converting analog to digital, and the planof the motion, which shows that the accuracy of the clock that generates the common impulse of digital tools. These common features of a media-quality equipment far exceeds the debug level of the human ear, so the difference between a good CD player and a CD player unnoticed even for a really good listener urgent.
In the second phase there is a wider range of variation of THD, depending on the nature of the amplifier. The tube amps will generate an additional setharmonics and THD reached 0.5%. In these solid-state TDH is much smaller and, in general, the amount of 0.005% to 0.1% depending on the amp in class A, B, AB, and so the frequency response of a good audio amplifier able to cover a wide range of 10Hz to 200 kHz and 1 dB noise figure can be better than 95 dB.
The first two phases are in "electronic" domain of the audio chain, where the signal can be transformed and enriched with high accuracy.
The thirdphase, but the situation is very different. Audio-pass the chain of electronics domain to physical domain, the air. The electrical signal is converted into sound waves from the transducers and the pilots of the baffle. "You generally are not included in the technical specifications of the speakers TDH (leader) is between 1% and 5%, which is an order of size several times larger than in previous stages. This means that allperfection attained in the previous phases cease to be relevant and is subject to final stage.
These are the bandwidth is quite similar. They talk about a full-range is very little use in high-marry because of their poor performance in the corners of the acoustic spectrum. The frequency response is thus the result of the overlap between 2 or 3 segments linear low (low, medium and high) and measured-3dB, which is where the power drops by half. The electro-acoustictransducer (driver) does not work as smoothly as we do not want the impedance varies with frequency, the effect of increasing load amp (watt), acts as a perfect cone vibrating piston radial and concentric modes creates peaks and valleys in response frequency.
Apart from the loudspeakers is very dependent on the size to reach the low frequencies. A small speaker system can lose up to 2 octaves of the bass sound for an extension of low frequency of 80Hzfollowing a reduction in the size of bass and reduce the amount of cabinet low, because of cost or design criteria. A great talk the other hand, offers a low better able to handle more power and more efficient, but its sound is more direction and increases the diameter of the cone. Also, the sound you hear is highly dependent on the position of the puzzle in the room, the reflection of waves in the ceiling, walls and floor, and itsthe position of the listener.
A final point to consider is efficiency. A system of quality speakers has an average return of 90 dB / W / m, and this will increase the production of sound level by 3 dB each time the amplifier doubles its power of example. 1, 2, 4, 8, 16 watts and so on. This means that a speaker with an efficiency of 93 dB / W / m, driven by an amplifier 100 watts RMS sound pressure itself becomes one of 90 dB / W / m with an amplifier at 200 watts RMS. So efficiency is avery important aspect to consider in a baffle.
From the above it appears that the speaker system, the fundamental piece of the audio chain, and is probably the least understood by ordinary people as to what we can expect from it and what are the physical limits of its components, determine which aspects of the project . So, to enjoy the sound more accurately and realistically, it is imperative that we do as the best speaker wecan be obtained. It is this last part of the chain that really defined the sound that you hear.
Related posts:
- What speakers work?
- Wall Speakers
- Ceiling Speaker JBL Vs Others
- B & W Home Theater Speaker
- JBL Wall Speakers
- Buy cheap Home Audio Subwoofers
- Stereo Amplifier – Get the biggest boom stereo
- What is audio compression and why should I care?
- Ceiling and wall speakers – Who ever thought of sound should be seen to be believed?
- Get the best reception Bookshelf Speaker
Topics: Ceiling Speakers Articles | Comments Off
Comments are closed.