BOSE 901 WestBorough

Commentary

A speaker system developed for the purpose of reproducing the impression obtained from music before the superiority and inferiority of physical characteristics are maximized.
It is built on patent theories such as "direct / reflective", "flat power radiation", and "active equalization".

The enclosure is an acoustic matrix enclosure (A.M. E.).
The interior of the cabinet is precisely divided into nine equal parts to accurately reproduce the deep bass and reduce distortion. The dimensional error of each room is finished on a scale of less than 1/1000 inch of the design value.
This ensures uniform air volume and prevents the occurrence of standing waves.
This eliminates the need for a sound absorbing material such as the cabinet of a typical speaker, making it possible to use all the internal niter acoustically.
The "resonance damping" effect of the cabinet air, which is fixed for each unit, and the tuning of the bass reflex port mounted on the back, apply the damping to the front aftermovement of the cone paper and release the maximum acoustic energy while suppressing the amplitude.
The bus recovery port (rear active air column) is arranged in three positions depending on the direction of the unit. It is arranged by calculating the energy efficiency, direction and phase consistency of the compressed air.
In addition, the shape is designed based on the same hydrodynamics used for jet jets. While preventing turbulence caused by high-speed air jets, it has the ability to instantaneously send air at a speed of 100 km / h. It realizes clear and responsive playback even at high volume.

Nine 11.5 cm cone type units are used for the speaker unit.
In order to finish the unit uniformly, we are developing a computer program to control 126 points to wind the voice coil of the unit as accurately as possible.
By controlling even a small amount of adhesive, the impedance curve of the speaker that was considered impossible to align is made uniform.

The speaker terminal uses a gold-plated screw terminal type.

It has an active equalizer.

Model Rating

Method	Direct / reflexing speaker system
<901WB>
Unit	For all bands : 9 x 11.5 cm cone type
Acoustic energy distribution	Reflection component : 89% Direct component : 11%
Allowable input	270W (rms, IEC268-5) 700W(peak)
Impedance	8 Ω
Frequency characteristic	30 Hz to 18 kHz
Cross-sectional area of line corresponding to terminal	0.75 to 5.5 square millimeters
External dimensions	Width 538x Height 322x Depth 344 mm
Weight	17.2kg
<901WB-EQ>
Input impedance	47k Ω
Output impedance	1k Ω
Dynamic range	106dB(35Hz)
Distortion factor	0.09% or Less (THD 1 kHz, 1 V Input)
Room acoustic	Mid-Bass : 225 Hz, ± 6 dB
Compensator control	Mid-Treble : 3 kHz, ± 6 dB
Bass switch	3 kHz, -6dB/oct.
Rated power consumption	3W
External dimensions	Width 330x Height 70x Depth 125 mm
Weight	1.5kg
<General>
Attachment	Insulator 4 Pieces / 1 Piece Two audio pin cables
Sold Separately	Dedicated Floor-Placing Stand PS-9 (1 set of 2, ¥ 40,000)