DIATONE DS-30B

Commentary

A bookshelf speaker system with a triangular duct and 30 cm woofer.

A 30 cm cone type woofer is installed in the low range.
Corn paper is made from carefully selected pulp and processed by the air-dry method. It is made into a curved cone with thick corrugation. In this method, the metal does not directly touch the corn paper during molding, so it can obtain strength with moderate internal loss for the diaphragm. In addition, the fibers are bonded together without being damaged, and a beautiful afterglow can be obtained when reproduced. In addition, the dust cap is an air-dry type with the surface pressed by mesh to prevent the inside from falling out which tends to occur in 2-way systems.
The edge is a double-woven thick fabric with a mixture of thermosetting resin and viscoelastic resin. It is coated in several batches. In addition, it is coated with acrylic resin to provide an upper structure that can withstand high output.
The magnetic circuit uses a large ferrite magnet with a diameter of 140 mm to achieve a magnetic flux density of 10,500 gauss. The frame is made of thick die-cast to suppress resonance and improve resolution.

A 6 cm cone type tweeter is installed in the high range.
This unit uses a back chamber with an orifice structure, which is also used in the DS-25B. A sub-frame with an orifice in the chamber is attached to provide acoustic braking, eliminating the deterioration of transients.
In addition, the center cap is made of titanium with excellent rigidity to prevent split vibration.

The enclosure uses a bass reflex system using a triangular duct with a triangular opening.
The triangular duct suppresses resonance inside the duct, standing waves inside the cabinet, and natural vibrations of the duct itself. This eliminates turbidity in the mid - and high-frequency range and improves resolution in the low-frequency range.
In addition, a distributed resonance structure has been adopted for the internal structure to disperse the resonance mode and eliminate the box sound.

Model Rating

Method	2-way, 2-speaker, Bass reflex, bookshelf type
Units Used	For low band : 30 cm cone type For high pass : 6 cm cone type
Nominal impedance	8 Ω
Playback frequency band	40 Hz to 20 kHz
Crossover frequency	1.5kHz
Output sound pressure level	92dB/W
Max Input	60W
Level control	High Frequency : 3 positions (1.5 kHz to 20 kHz)
External dimensions	Width 370x Height 630x Depth 301 mm
Weight	20kg