Ultimate Studio Home Theatre

Total Professional Concept

 

Benefits of professional drivers

1) Drivers with diaphragms made of various materials, but the same design, can reproduce the sound almost ideally. There is no fundamental difference in the sound of the same type of the drivers where diffusers are made of different materials. This is typical for speakers that operate at frequencies below 1000 Hz. For this reason, subwoofer and mid-woofers can be made of any material. Their sound is much more dependent on the specific model dynamics and the implementation of its various materials and engineering principles that reduce distortion. Generally, nowadays are used materials like paper, Kevlar, carbon fiber, polypropylene, etc. These materials are not used in clear form as it was before. Always, more or less decent, drivers have a diaphragm with additional sockets in the base material which manufacturer is not mentioning in the declaration. Such additives can greatly change the usual character of the sound of the base material. As an example, JBL studio monitors of the last century had some additional elements that were added in cones like Kevlar, carbon and polypropylene.

2) Drivers made of hard materials (titanium, Kevlar), have greater resolution but can add to playable audio detail to their own resonances. Drivers of soft material (silk, paper) have lower resolution, but a minimum of resonances. Greater influence on the sound material of diaphragm can be observed only at medium and high frequencies.

3) Fundamentally different sound has midrange and tweeters that have excellent design of the cone or diaphragm of different materials. The first category represents AMT drivers (emitters Hale) and the second is professional midrange compression driver that actually represents enlarged tweeters. Special different material used for the manufacture of the diaphragms of these speakers, after the use of titanium is, of course, beryllium.

But if all drivers, except ribbon and titanium compression drivers, sound almost the same, then why in the high-quality acoustics we should use the professional drivers? What are their advantages over other home acoustic drivers?

Professional drivers are capable of receiving and reproducing sound of great capacity and there is no possibility of overloading. That does not mean that they must be "turned on" to the maximum. The fact is that in the time of not so loud audio material playback in the record may be places with powerful dynamic bursts. This is usual during the explosions, gunfire, sounds of lapping cars, etc. During these moments powerful signal that should be delivered to the speaker output can exceed the nominal value, leading to a blurry reproduction of loud noises. At the Ultimate Studio theatres this moment is particularly critical. Since the acoustic system should be cover the large space without distortions, causing a vibration of the internal organs and even some ear buzzing effect, of course for those who love that. These requirements can satisfy only professional speakers.

Dynamic overload is not characteristic only for the speakers but also for the amplifiers, which should be chosen with a nominal backup power reserve at least four times exceeding the value of drivers. This again does not mean that the driver with power of 800 watts must be attached to the more powerful amplifier of even 2000 Watts. Here we consider that maximum is necessary to develop sound pressure level at a certain distance, and based on that to calculate the required power of driver and amplifier. If a driver with a capacity of 600 watts is operated by only 100W in that case you need an amplifier up to 400-600W.

All professional drivers have very high sensitivity. The increased value of this parameter along with power is logical: acoustic system should develop high sound pressure that is achieved by using powerful and high sensitive drivers. The result is reproduction without surge and distortion, but that is not all. High sensitivity speaker will save quite amount of money to purchase a power amplifier. Efficiency index of the home drivers is in a range 84-88 dB and tweeters over 90Hz. The sensitivity of the subwoofers starts at 97 dB and compression mid-woofers and tweeters from 105dB. For producing sound of 98dB and higher, home cone driver should receive the signal of 16W.Professional device can reproduce such sound and even stronger sound with only one watt input power. At 16 watts, they give out more than 110 dB SPL with an enormous reserve of power, and the midrange and tweeters are able to reproduce the sound of 110dB with the signal power of 1-2W. Not difficult to guess that the power of drivers does not give any manifestation of sound that can be reproduced if there is no data on the efficiency of the driver.

Unfortunately, many people forget how to achieve high efficiency. The high value of this parameter indicates that the driver is designed has quality design. It uses a light diffuser, a powerful magnet, large voice coil, etc. All this provides a great response of the diffuser on the variation of the input electrical signal and more accurate sound reproduction across the operating band. Home drivers are, in this sense, quite "dystrophic" from the very beginning, which can be clearly seen by comparing the characteristics of magnetic systems of both groups of speakers, especially the compression driver. Because of the high quality professional drivers with an elusive sound samples, sound seems unreachable for the house acoustics.

Only the professional drivers are able to sound the room in the way that satisfies the concept of Ultimate Studio. The strict norm regulates not only the capacity but the size also. The larger room means more subwoofers that enable naturalness of the sound and thunderous bass response. The maximal diameter of house subwoofers is twelve inches. Ultimate Studio acoustics only use drivers of that diameter only as mid-woofers. To ensure good bass reproduction should be used loudspeakers with the size of a minimum of 15". Even more preferably is the large 18" or more inches for a more natural and surround reproduction of low frequencies.

Professional speakers have the following advantages over the home acoustics:

Low-frequency drivers. They are always made of paper, because only the use of this material in the diaphragm allows obtaining high efficiency. The main advantage of professional drivers is hard membrane suspension, which does not allow the membrane to enter the self-oscillating mode when playing the lower bass. For this reason, all of them are characterized by a clean, faster and dry low frequency reproduction. But it is also a drawback: even larger drivers have problems with the reproduction of frequencies below 30Hz. Everything depends on the specific model. This threshold can be approximated very close to 20 Hz using drivers with soft suspension, dual 18 "speakers in total body or a diffuser diameter of 21".

Mid-woofer drivers. Everything said before also stands for the mid-woofers. At the home acoustics market the diameter of12 "have only subwoofers with the upper limit of the frequency range which of 200-300 Hz. Professional samples of the same size can easily reproduce frequencies up to 3 kHz, which is more than enough and they are eligible to reproduce the frequencies in range 600-1000 Hz. In the catalogues of manufacturers those drivers are called they are called Midrange / Mid-Bass Transducers and do not have concentric rings of rigidity in their diaphragms.

Midrange and the compression drivers. These drivers are completely identical, except those with larger dimensions that have characteristic of midrange. They have a domed structure and compression principle. They should have a horn, which provides them with greater efficiency, a narrow focus and "thick" sound image in the open sound zone. MIDRANGE professional titanium compression drivers are a unique type of driver (except the ribbon and AMT) that is able to qualitatively reproduce midrange tones in range 600-8000 Hz, which is most sensitive for the human ear. The "Limit" for all other cone or soft home acoustic drivers is 3-5 kHz. High sensitivity, the dome shaped form, light and strong titanium diaphragm, magnetic systems with high density and immense power drivers provide professional midrange drivers elusive for all cone and most soft dome shaped drivers most of the playback quality and performance. However, most of the tweeter has a problem with the playback frequency of 16 kHz, although you can find models that do not have this drawback. For high frequencies is better to use just ribbon or AMT drivers which is almost impossible to find in retail, but they are with ready-made casings. As far as I know, the company Beyma sells one of its AMT drivers.

Articles

Basics of studio sound reproduction

Ultimate Studio audio systems

Add-on

Other