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ENGINEERS' AND ARCHITECTS'
SPECIFICATIONS
The low-frequency loudspeaker shall be a
multiple driver, low-frequency system with
matched active equalisation as follows:
The transducer complement shall consist of
two low-frequency drivers of 12" diameter,
mounted symmetrically.
The bass enclosure shall be composed of
13-ply marine-grade Baltic birch with 16
stainless steel hang points and a paintable
contoured stainless
steel grille. Its outer dimensions shall be 648
mm x 508 mm x 714 mm (25.5"D x 20"W x
28.1"H ). Its weight shall be 59 kg (129 lb).
The loudspeaker shall comply with ANSI/EIA
636 for electrical and mechanical safety and
for the EU EMC directives 89/336/EEC and
92/31/EEC.
All versions of this product shall bear the CE
mark, unless restricted to North American or
Japanese markets.
The loudspeaker shall be the Bose
LT MB24-III loudspeaker.
TECHNICAL LITERATURE
PANARAY LT Reference Guide
Available at pro.bose.com
SAFETY AND REGULATORY
COMPLIANCE
The LT MB24-III loudspeaker complies with
ANSI/EIA-636 Recommended Loudspeaker
Safety Practices and with EU EMC Directives
89/336/EEC for CE marking.
SAFETY FEATURES
EIA-636: Recommended Loudspeaker Safety
Practices.
This document is a set of guidelines
related to the safe design and testing of
loudspeakers and their components set
by the Electronics Industry Association.
Although one cannot list a product to the
standard, Bose has performed the tests
outlined for the LT MB24-III and it complies
with the standard as set forth in EIA-636.
WARRANTY
The Bose Panaray LT MB24-III mid/high-
frequency loudspeaker is covered by a 5-
year, transferable limited warranty.
Panaray
®
®
HOW OUR LOUDSPEAKERS ARE
MEASURED
1. Power Handling
Full bandwidth pink noise, meeting the
IEC Standard #268-5, is applied to the
loudspeaker and amplified to a level at the
loudspeaker terminals corresponding to
the power handling of the loudspeaker. The
loudspeaker must show no visible damage
or measurable loss of performance after 100
hours of continuous testing
2. Sensitivity
Full bandwidth pink noise is applied to the
loudspeaker with its active equalisation
curve and amplified to a level at the
loudspeaker terminals corresponding
to 1 watt as referenced to the nominal
impedance. The average sound pressure level
(dB-SPL) is measured at 1 meter from the
speaker in an anechoic environment.
3. Maximum SPL
Full bandwidth pink noise is applied to the
loudspeaker with its active equalisation
curve and amplified to a level at the
loudspeaker terminals corresponding to
the long-term rated power handling of the
speaker. The average sound pressure level
(dB-SPL) is measured at 1 meter from the
speaker in an anechoic environment.
4. Frequency Range
Sine waves are injected into the loudspeaker
and the level is adjusted to 1W, as
referenced to the nominal impedance, and
the level measured at 1m. Resulting graph is
smoothed by 0.05 octave-band.
All information subject to change without notice.
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