3
English
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.
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 MB4 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 top of each loudspeaker
cabinet have a metric M8 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.
CAUTION:
Use only graded hardware. Fasteners should be metric Grade 8.8 minimum and should be tightened
using a 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. Lockwashers or a thread locking compound intended for
hand disassembly (such as Loctite
®
242) should be used for a vibration resistant assembly.
CAUTION:
The fastener should be long enough to engage no fewer than 8 and no more than 20 threads of the
attachment point. A fastener should protrude by 16 to 22 mm, with 18 mm preferred (
5
/
8
to
7
/
8
inch, with
11
/
16
inch 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
5
/
16
-18 UNC fasteners are very
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
5
/
16
-inch washers and lockwashers for the 8 mm ones.
Installation of MB4 Loudspeaker..........................continues on p11
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