Engineers’ and architects’ specifi cations
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 305mm (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 648mm x 508mm x
714mm (DxWxH) (25.5”x 20”x 28.1”). Its weight shall be 59kg (129lb).
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
®
PANARAY
®
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/highfrequency loudspeaker is
covered by a 5-year, transferable limited warranty.
Product codes
MB24 – Black PC 040175
MB24 – White PC 040706
Replacement parts
Grille with screws and logo-Blk PN 297514
Grille with screws and logo-Wht PN 298561
Input panel kit-Blk PN 297518
Input panel kit-Wht PN 298570
Woofer PN 297519
Replacement logo assembly-Blk PN 297504
Replacement logo assembly-Wht PN 297505
Replacement screws for grille-Blk PN 297502
Replacement screws for grille-Wht PN 297503
Hang Point Screw-Blk PN 298591
Hang Point Screw-Wht PN 298316
All replacement parts are available at authorized Bose Service Centers.
How our loudspeakers are measured
1. Power Handling
Full bandwidth pink noise, meeting the IEC Standard #268-5, is
applied to the loudspeaker and amplifi ed 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 amplifi ed 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 amplifi ed 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.
BOSE
®
PANARAY
®
LT MB24-III modular bass loudspeaker
(21 pages)
(69 pages)
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