BOSE 242 WestBorough

Commentary

A acoustimass speaker system that can step up to 363 when combined with 121.

The 242 West Borough uses a woofer made by Kusu Timas, a technology patented by Bose in the United States, for the low band, and a newly developed soft dome type tweeter for the high band to achieve a wide range.

A 2.5 cm soft dome type tweeter is installed in the high range.
This unit uses a very thin Tetoron for the diaphragm to suppress peaks and dips and make possible less colored sound. In addition, by shortening the stroke of the horn part around the dome, the wide directivity of the dome type is exhibited.
In addition, the magnetic circuit is filled with magnetic fluid to improve damping characteristics and reduce distortion components.

A 16 cm cone type woofer unit is used for the low range, and it is a acoustimass system mounted inside the base enclosure.
In this system, since the woofer unit is hidden inside the cabinet, acoustic energy is radiated outside in resonance with the air mass inside the port. Therefore, even if mid-range energy or strain occurs inside the cabinet, resonance does not occur because the frequency energy is different from the resonance frequency of the air inside the port. This acoustic filter effect cuts out high frequency strain.
In addition, the port outlet has been designed taking full advantage of hydrodynamics to prevent air jet energy from becoming turbulent, which not only eliminates port noise but also improves the reproduction efficiency of low-frequency energy.

In the Acoustic Kusu system, acoustic energy is radiated through ports located at the front and rear of the unit. Each port is tuned to a different frequency. Near the tuning frequency of port A, there is almost no output from port B on the front side of the unit. However, from port A, large acoustic energy can be obtained without moving the cone paper very much. Conversely, near the tuning frequency of port B, there is almost no output from the rear side and large acoustic energy can be obtained from the front side.
This structure allows both outputs to be combined in the region between the two tuning frequencies, resulting in a flat and high-efficiency bass over a very wide bandwidth.
The playback bandwidth at this port is a wide range of more than two octaves.

The enclosure uses MDF made from 100% conifer in pursuit of musical beauty.
In addition, the side panel is finished in a bird's eye maple style, and the surface is treated with a special UV coating that is hard to get scratches to increase durability.

The speaker terminal is a gold-plated screw-in type. This terminal is also compatible with a banana plug.

There was a special speaker stand sold separately.

Model Rating

Method	2-way, 2-speaker, Kusu timmass system, bookshelf type, magnetic protection design
Units Used	For low band : 16 cm cone type For high pass : 2.5 cm cone type
Impedance	6 Ω (connected to 121)
Allowable input	80W(rms) 210W(peak) * By connection with 121
Low flux leakage	Canceling magnet system
External dimensions	Width 270x Height 415x Depth 268 mm
Weight	11.5kg
Sold Separately	Dedicated Speaker Stand PS-3 (2 pcs 1 set, ¥ 22,000)