Electrodynamic heads and sound columns. Reference data

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Broadband electrodynamic heads of the 30GDSh-27D series, as well as two-way 30GDSh-34D (with a coaxially installed RF head) are intended mainly for use in automotive acoustic systems as broadband radiators. Heads of the 30GDSh-28D series are distinguished by a honeycomb membrane and are recommended for automotive speakers as broadband radiators, as well as for stationary speakers as bandpass radiators (LF and MF). Heads ZOGDN-ZZD with a dome diffuser and a rubber suspension are recommended to be installed in small-sized speakers.

In the designation of the heads, the symbol "P" corresponds to the design option of the diffuser holder for installing the head outside the acoustic design case, and the symbol "K" corresponds to the option for installing the head on the inside of the acoustic design panel. Heads with a decorative protective grille have the symbol "P" in their designation.

Maximum sinusoidal power for heads 30GDSh-27D, 30GDN-ZZD, 30GDSh-34D - 30 W, for heads 30GDSh-28D - 25 W; maximum noise power - 30 W; maximum long-term power - 35 W; maximum short-term power - 40 watts. All heads listed here have a nominal electrical resistance of 4 ohms; their main parameters are summarized in Table. 1.

On fig. 1 shows a variant of the design of these heads with the symbol "K" (round), and in fig. 2 - with the symbol "P" ("rectangular"). Height 80 mm corresponds to heads ZOGDN-ZZD, 30GDSh-34D.

On fig. 3-6 show the frequency response of the heads mentioned in Table 1.

JSC "Dynamik" has developed a new high-frequency dynamic head 25GDV-23D (T40-23D). It has some design features. It uses a flat membrane as a radiator, clamped in the center and along the periphery. The head has a short exponential horn and a bullet-shaped concentrator. To remove heat from the coil and improve damping, the gap of the magnetic system is filled with a magnetorheological fluid.

The head is designed for use in multi-way modular acoustic systems and high power units. In the AC, it is connected through an LC high-pass filter, which protects the head from overload by low-frequency signals.

The filter parameters are given in Table. 2, and the filter circuit - in fig. 7. The head has a nominal electrical resistance of 8 ohms, and the resistance of the resistor R1 is selected in relation to the sensitivity of the loudspeaker in other bands. Depending on the cutoff frequency - 5, 8 and 10 kHz, the values ​​​​of the maximum power of the speaker in which this head is installed are different: 40, 80 and 120 W, respectively.

The main parameters of the head are given in table. 3, the frequency response is shown in fig. 8. Its design and installation dimensions are shown in fig. 9.

On the basis of electrodynamic heads, developed at DYNAMIC JSC, loudspeakers - sound columns are produced. They are a line of the same type of emitters (dynamic heads) mounted in aluminum cases together with a matching transformer. Depending on the number of heads, the speakers have different radiation patterns in the vertical plane. Speakers can be used for scoring open spaces, sports fields, stadiums, industrial premises, hangars, cargo areas, platforms.

Sound speakers can be connected to a wired broadcasting network or to local amplifiers with a rated output voltage of 30, 90 or 120 V, and the speakers are connected to any of the indicated voltages using a three-wire cord without opening them. Three models 10KZ-14D, 20KZ-13D, 30KZ-12D have a reproducible frequency range of 250 ... 12500 Hz and the corresponding maximum noise power - 10, 20 and 30 watts.

The main parameters of the columns are summarized in Table. 4, and the frequency characteristics and drawings with overall and mounting dimensions of some of them are shown in fig. 10, 11.

Radiation patterns are important for the correct placement of loudspeakers in the sounded area. On fig. 12, 13 respectively show the radiation patterns in the vertical and horizontal planes for the column 10KZ-14D, in fig. 14, 15 - for column 20KZ-13D, in fig. 16, 17 - for column 30KZ-12D. In all diagrams, the solid line corresponds to a signal frequency of 1 kHz, the dashed line corresponds to 4 kHz, and the dotted line corresponds to 8 kHz. At lower frequencies, the directivity of the radiation from the speakers is less.

JSC "DYNAMIC"
Russia, 215010, Gagarin, Smolensk region, st. Gagarina, 16
Тел. 4-10-71, 4-19-09
Тел./факс: (08135) 4-28-07, 4-18-70
Email:

Author: V.Demin, Gagarin, Smolensk region

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