Boston Acoustics 261 User Manual
251
261
Designer Series
In-Wall Speaker Systems
2
Specifications 251 261
Frequency Response (±3dB) 66–20,000Hz 58–20,000Hz
Recommended Amplifier Power 10–100 watts 10–100 watts
Nominal Impedance 8 ohms 8 ohms
Sensitivity [1 watt (2.83v) at 1m] 89dB 90dB
Tweeter
3
⁄4" (19mm) dome
3
⁄4" (19mm) dome
Bass Unit 51⁄4" (135mm) copolymer 61⁄2" (165mm) copolymer
Crossover Frequency 6500Hz 6200Hz
External Dimensions (HxW) 91⁄2 x63⁄4" (241 x 171mm) 109⁄16 x73⁄4" (268 x 197mm)
Mounting Hole Cutout (HxW) 83⁄
4 x5
3
⁄4" (223 x 146mm) 97⁄
8 x7
1
⁄8" (251 x 181mm)
Mounting Depth (from surface) 25⁄8" (67mm) 27⁄8" (73mm)
Description
Boston Designer Series speaker systems are designed to be as accurate, clean, and musical as our
free-standing speakers. The unobtrusive, flush-mount design makes them ideal for installation
in walls or ceilings of rooms where space or decor make conventional speakers undesirable or
inappropriate. They can also be used for the front and/or rear channels in a home theater system.
The front surface is provided with a matte white finish. The speaker can be installed as is or can be
painted to match the room environment, using the supplied painting mask. The speaker grille is
removable, and is made of epoxy-painted galvanized steel.
Their smooth, detailed sound comes from two highly refined driver elements: a copolymer bass unit
with butyl rubber surround for powerful bass and natural midrange, and a
3
⁄4-inch dome tweeter that
provides outstanding clarity and articulation. The tweeter and bass unit are mounted close together
in a point-source configuration for excellent imaging and extremely broad, uniform dispersion. This
is important, because wide dispersion gives you the flexibility to install the speakers where they look
the best (high on the walls, for example), yet still project clear sound throughout the listening area.
Both drivers are built in Boston’s state-of-the-art production facility to be within ±1dB of the laboratory reference, perhaps the industry’s tightest tolerance.
3
Installation Instructions
IMPORTANT: This manual assumes the installer possesses skill in the proper use of hand and
power tools, a knowledge of local building and fire codes, and a familiarity with the environment
behind the wall or ceiling in which the speakers will be installed.
Quantity Description
2 Designer Series Speakers
2 Mounting Bracket
2 Painting Mask
2 Metal Grille
1 Template
1 Owner’s Manual/Installation
Instructions
1 Hardware Package*
Examine the contents of the package and verify that it contains the following:
Loudspeaker Side View Mounting Bracket Mounting Hole
251
261
91⁄2"
(241mm)
95⁄8"
(143mm)
83⁄4"
(223mm)
109⁄16"
(268mm)
101⁄2"
(267mm)
97⁄8
"
(251mm)
6
3
⁄4"
(171mm)
2
5
⁄8"
(67mm)
5
5
⁄8"
(143mm)
5
3
⁄4"
(146mm)
7
3
⁄4"
(197mm)
2
7
⁄8"
(73mm)
6
11
⁄16
"
(170mm)
7
1
⁄8"
(181mm)
Hardware Package* Contents:
Quantity Description
12 8-32 x 2" Screw
2 Cable Clamp–Press-In
* If the hardware package is missing any items or is
not found, additional packages are available from
Boston Acoustics.
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