Audio Database
B-4000A Moorish
Commentary

A speaker system from the Symphony Series.

Two 30 cm cone type woofers are installed in the low range.
A cone made of pulp and paper and wool is used for the diaphragm, and a variable density system is used. The density is highest in the central part and decreases as it goes to the periphery. This prevents interference due to flapping and reflection of propagating waves and provides a constant response.

The mid-range is equipped with 16 cm cone type mid-range.
The diaphragm has a structure in which light aluminum is sandwiched between two thin neoprene rubber films. The center and periphery are processed into a stepped shape to realize a clear and natural sound.

Eight 5-cm cone tweeters are installed in the high range.
The cone is placed on a foam rubber platform to damp spurious peaks and vibrations. Similarly, ranges above 10 kHz are handled by a 2 cm aluminum center dome. This is based on the principle that the diameter of the cone must not exceed the wavelength of the maximum reproduction frequency.

The unit layout of the enclosure is symmetrical, and the tweeter is arranged in a vertical line to obtain wide horizontal directivity.
In addition, the exterior has a matte walnut finish and uses an arch frame which is a traditional design of bozak.

There was a variation of wiring for 2-way multi-amplifier by special order.

Model Rating
Method 3-way, 11-speaker, airtight type, floor type
Units Used For low band : 30 cm cone x2
For Medium Range : 16 cm cone type
For high pass : 8 x 5 cm cone type
Playback frequency 35 Hz to 20 kHz
Impedance 8 Ω
Allowable input 100W(MUSIC)
Crossover frequency 400 Hz, 2.5 kHz (6dB/oct.)
External dimensions Width 660x Height 1,130x Depth 387 mm
Weight 74.8kg