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For Permanent Installation
WARNING:
Permanent installations involve the attachment of the loudspeakers to brackets or other mounting surfaces
for long-term or seasonal use. Such mountings, frequently in overhead locations, involve risk of personal injury if either the
mounting system or the loudspeaker attachment fails.
CAUTION:
Use only graded hardware. Fasteners should be metric Grade 8.8 minimum and should be tightened
using torque not to exceed 50 inch-pounds (5.6 Newton-meters). Overtightening the fastener could result in irreparable
damage to the cabinet and an unsafe assembly.
Do not re-tighten these fasteners unless they are visibly loose. Characteristics of the plastic cabinet may cause some
relaxation of tightening torque over time, which is normal. Lockwashers or a thread locking compound intended for hand
disassembly (such as Loctite
CAUTION:
The fastener should be long enough to engage no fewer than 8 and no more than 12 threads of the
attachment point. A fastener should protrude by 10 to 15 mm, with 12 mm preferred (
beyond the assembled mounting parts to provide sufficient threaded attachment to the loudspeaker. Using a fastener that is
too long may result in irreparable damage to the cabinet and, when overtightened, can create a potentially unsafe assembly.
Using a fastener that is too short provides inadequate holding power and may strip the mounting threads, resulting in an
unsafe assembly. Confirm that at least 8 full threads are engaged in your assembly.
CAUTION:
Do not attempt to alter the threaded attachment points. While SAE
similar in appearance to the metric M8, they are not interchangeable. Do not attempt to re-thread the attachment points to
accommodate any other thread size or type. Doing this will render the installation unsafe and will permanently damage the
loudspeaker. You may substitute
Installation of 402
®
Bose
offers permanent mounting brackets for the safe use of these loudspeakers in such
installations. However, we realize some installations may call for use of other, custom-
designed mounting solutions or non-Bose mounting products. While Bose Corporation
cannot be held responsible for the proper design and use of non-Bose mounting systems,
we offer the following guidelines for the permanent installation of any Bose 402 loudspeaker:
• Obtain your mounting system from a reputable manufacturer, and make sure the system
is specifically designed for the loudspeaker of choice and your intended use.
• Before using a custom-designed and fabricated mounting system, have a licensed
professional engineer review the design and fabrication for structural integrity and safety
in the intended application.
• Notice that all threaded attachment points on the bottom and rear of each loudspeaker
cabinet have a metric M8 x 1.25 thread with at least 10 usable threads.
• Use a safety cable, separately attached to the cabinet at a point not in common with
the load bearing attachment points of the bracket to the loudspeaker.
• If you are unfamiliar with the proper design, use, and purpose of a safety cable, consult a
licensed professional engineer, a rigging professional, or a theatrical lighting trades
professional.
®
242) should be used for a vibration resistant assembly.
5
/
-inch washers and lockwashers for the 8 mm ones.
16
®
Loudspeakers..................continues on p11
3
/
8
to
5
/
inch, with
1
/
inch preferred)
8
2
5
/
-18 UNC fasteners are very
16
3
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