New technology of speakers

In recent years, with the development of new materials, new technologies, new structures, new processes, stereo technology, digital technology applications, the popularity of CD and VCD, loudspeakers and their systems have also achieved great development, and new products continue to emerge. JBL, EV, Ph.D. companies, British KEF, TONNY companies, Japan's Panasonic, Pioneer, Mitsubishi, TOA, Yamaha companies have all launched a variety of speakers and speaker systems in recent years. Their distinctive feature is that they can withstand high power and uniformity. Above 200W, the efficiency is high, generally 98-100bb, and the directivity is wide.

In order to realize the above-mentioned characteristics, the speaker manufacturers' eight immortals cross the sea and each show their magical powers. The main methods adopted are as follows.

 (1) Adopt new magnetic materials and use new magnetic circuit design methods, such as the SFG magnetic circuit design adopted by JBL, which includes a new structure setting that balances the magnetic flux and reduces the inductance and heat conduction of the driving source. The magnetic materials used are other The magnetic energy level is above 3.6MGsOe, which increases the capacity of the speaker to withstand the power, and reproduces the bass with a strong and powerful force.

(2) New materials are used, such as the tweeter diaphragm made of titanium material. Because the EP of titanium metal is superior to female materials, it is suitable for manufacturing high-quality tweeter diaphragms. The use certificate. The tweeter of the titanium diaphragm can obtain high frequency. With a larger extension, the power capacity has also been greatly improved. The woofer uses a laminated high-density composite paper cone, and the voice coil uses a flat wire. Due to the high space factor of the flat wire and the high utilization rate of the magnetic circuit gap, higher sensitivity can be obtained. This technology was invented by JBL and other major companies Have followed suit.

(3) Adopt the new model tube. The exponential horn loudspeaker that has been used for a long time in professional sound reinforcement has been replaced by a new type of iso-directional horn. The key technology of iso-directional horn is that the horn adopts different shapes of side walls. Because of the simple linear and exponential in the past, it has become complicated , Discontinuous function formula, in order to achieve constant directivity.

(4) Computer CAD, CAM and CAT technology are widely used, and modern technology is used to tap the potential of traditional loudspeakers to make loudspeaker products more perfect. Representative products, such as JBL's MR professional loudspeaker series and SR professional loudspeaker series.

In particular, the speakers of JBL, which occupies an important position in the audio field, have high endurance power, high sensitivity, flat frequency response, excellent transients, and some unique new technologies.

(1) The magnetic poles of the low-frequency speaker for sound box are quite thick, the magnetic pole core is hollow, and the inserts formed by wire cutting are inserted on the magnetic pole core. This specially designed magnetic pole core can reduce the weight of the speaker, facilitate heat dissipation, and improve the power bearing capacity.

(2) As an advanced technology, the flat wire voice coil was invented by JBL. It was first used in woofers, and later tweeters were also commonly used. Both aluminum and copper wires are available. According to tests, they are in the same magnetic circuit. The flat wire voice coil can increase the sensitivity by about 1db than the round wire voice coil.

(3) Titanium diaphragm dome-shaped unit is also the first success of JBL company. The Young's modulus of titanium material is superior to that of female material. The tweeter using titanium diaphragm expands the high-frequency cut-off frequency to 27kHz and has a power capacity. Significant increase.

(4) The SFG symmetrical magnetic field magnetic circuit titanium diaphragm is a patented technology of JBL. This patented technology ensures that the FB value distribution on the magnetic gap is symmetrical and the up and down positions of the voice coil are equal. It includes the balance of the magnetic flux, which reduces the inductance of the drive source and The structural setting of heat conduction effectively suppresses low frequency distortion and improves the power bearing capacity and damping characteristics.

 JBL has specially designed various types of dual-radial horns so that the horizontal and vertical directions can be selected according to the needs of use. The directivity of its products includes 100°×100°. , 120°(H)×49°(V), 90°(H)×40°(V), 60°(H)×40°(V), 40°(H)×20°(V), etc. .

The internal structure of a speaker uses a number of new technologies, including the use of VALOX materials to make extra-strong interlocking angles, high-temperature bonding technology to bond the reinforcing ribs, and the aperture design of the horn to greatly reduce mid-frequency distortion, and meet the requirements of acoustic design Special custom-made plates, reinforcing ribs to prevent resonance of the cabinet, open gap self-cooling (VGC) design woofer, steel protection net, specially treated fiber felt attracting material and used for built-in passive crossover or use External electronic frequency divider and two sets of power amplifiers work mode switching high-current switching switch.