Loudspeaker with PEERLESS drivers. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Speakers

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We offer a description of another loudspeaker design from the book prepared for publication by S. D. Batya. This loudspeaker is made without a bass reflex, in a closed housing, so it is recommended to use it as a satellite in speakers with an additional low-frequency loudspeaker.

The closed housing prevents an acoustic short circuit of the dynamic head, when, during low-frequency oscillations, compression and rarefaction of air from the front side of the diffuser are compensated by rarefaction and compression created by its rear side. This process takes place at wavelengths exceeding the diameter of the diffuser, i.e. at relatively low frequencies (below 1 kHz).

The BT-2 loudspeaker is designed as a high quality "satellite" to work together with an additional bass link. As part of the task, it was decided to place the heads on the front panel of the case in the MTM configuration (MTM - midle, tweeter, midle), when the tweeter is installed between two midrange heads. This arrangement of dynamic heads contributes to the expansion of the radiation pattern in the horizontal plane and narrowing - in the vertical.

The BT-2 loudspeaker uses two PEERLESS 830436 dynamic heads, reproducing low-midrange signals, and a PEERLESS 810665 HF head (you can find information about these heads on the website arkada.com). The enclosure of the closed-type loudspeaker with a useful volume of 12 liters is made of 16 mm thick MDF material.

The housing drawing is shown in fig. 1. Hydrostekloizol was chosen as an anti-vibration coating, and the internal volume is filled with a low-density synthetic winterizer.

A rectangular terminal is fixed in the rear wall, for which the hole has dimensions of 94x74 mm. The design of the terminal is not of fundamental importance: you can simply attach two terminals suitable for connecting a cable to the rear panel.

The frequency response of the VT-2 loudspeaker is shown in Fig. 2, the graph of the dependence of the impedance modulus on frequency is shown in Fig. 3, diagram - in Fig. 4.

Unlike a number of other PEERLESS HF heads, there is no magnetic fluid in the gap of the magnetic system of the 810665 head. High-frequency heads without magnetic fluid, as a rule, have an increased resolution when reproducing the sound of musical instruments, but require additional measures to be taken to protect against overload by mid-frequency signals.

In the crossover filter of the VT-2 loudspeaker, the high-frequency head is connected through a third-order high-pass filter C1C2L1. the filter retains its design characteristics in the operating frequency band by compensating the reactivity in the RF head impedance with the R2C5 and L2R1C3C4 chains. The midrange and bass heads are connected through a first order filter.

The VT-2 loudspeaker was demonstrated at the Russian High End 2000 exhibition. Experts and visitors characterized the sound of the VT-2 loudspeaker as dynamic and detailed with good localization of sound sources.

The author knows several amateurs who have successfully made this design: the VT-2 loudspeaker is distinguished by good repeatability of the design characteristics.

In the manufacture of loudspeakers, it is necessary to ensure the strength of the connection and the rigidity of the walls. The vibrations of the case must be strongly attenuated so as not to introduce a noticeable coloration into the sound of the loudspeaker.

The walls are connected using PVA glue and screws. Pre-drilled panels at the joints are smeared with glue and tightened with screws. Screws with a diameter of 3,5 - 4 and a length of 40 - 150 mm can be screwed well into the ends of plywood and MDF panels. It is advisable to sink the screw heads into cylindrical recesses, which are puttied and do not interfere with the decorative finish of the case. The partitions connecting the walls together are also secured with screws and glue.

Between the rear wall and the slats, a seal made of tape polyethylene foam is introduced, glued to the slats. The adhesive layer of these strips is protected by a strip of paper. The back walls are secured with screws, which are wrapped in slats. The number of screws for the rear wall is determined by the selected distance between the screws in the range of 80...100 mm.

The loudspeaker crossover filters use Solen capacitors for a nominal voltage of 250 V and ceramic resistors for a power of 5 W. You can also use capacitors K73-16 at 63 V and MBGO at 250 V.

The inductors of the separating filters are wound on organic glass frames with a wire with a diameter of 1 mm, and the L2 coil of the compensating circuit is 0,2 mm with an active resistance of not more than 3,5 Ohm. The active resistances of the coils L1, L3 should not exceed 0,2 ohms.

When making separating filter coils on your own, you can use the information from the table, where the following designations are used: D1 - inner diameter of the frame, D2 - cheek diameter, H - winding width (distance between cheeks), N - number of turns.

The appearance of the VT-2 loudspeakers is shown in fig. 5.

Author: S.Bat, Moscow

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