BOSE PANARAY LT MB24-III modular bass loudspeaker
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TECHNICAL DATA SHEET
Key features
> Proprietary acoustic enclosure provides clean, loud bass with high
driver reliability
> Enclosure size has been optimized to be used in multiple bass array
configurations
> High SPL without audible port noise
> 13-ply, marine-grade, Baltic birch enclosure
> 16 stainless steel hang points
> Contoured, powder-coated, stainless steel grille
> Selectable parallel and discrete modes
> Designed for indoor and most outdoor applications*
Applications
Product overview
The PANARAY LT MB24-III modular bass loudspeaker is a compact, lowfrequency loudspeaker designed exclusively for use with the PANARAY
LT mid/high-frequency loudspeaker family. The LT MB24-III integrates
two 305mm (12”) woofers in a proprietary acoustic enclosure. This
enables the LT MB24-III to deliver high SPL and wide bandwidth without
audible port noise. The size of the LT MB24-III has also been optimized
so that it can be used in multiple bass array configurations.
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The LT MB24-III loudspeaker is well-suited for professional installations
such as:
> Stadiums
> Arenas
> Houses of worship
> Auditoriums
> Performing arts facilities
> Dance clubs
> Outdoor* events facilities
Product information
Each PANARAY LT MB24-III bass loudspeaker uses two 305mm (12”)
low-frequency drivers built into a proprietary acoustic enclosure. The
LT MB24-III can be operated in parallel or discrete modes. In parallel
mode, a single amplified signal is connected to the loudspeaker. In
discrete mode, each loudspeaker can be independently driven by a
separate amplifier. Individual drivers are accessed through separate pins
on the Neutrik NL4 connectors. The 13-ply, marine-grade, Baltic birch
enclosure has sixteen hang points, four each on the top, bottom and
sides. Each hang point will accept SAE 3/8 - 16 rigging hardware.
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* PANARAY LT MB24 series III loudspeakers
LT loudspeakers can be installed outdoors under cover.
Please contact Bose for additional details.
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BOSE PANARAY LT MB24-III modular bass loudspeaker
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Detailed product specifications
Additional product information
The PANARAY LT MB24-III loudspeaker requires equalisation through
the use of BOSE active equalisation or by using a highpass filter and a
low-pass filter. Equalisation is required for both parallel and discrete
configurations.
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Active equalisation curve
On-Axis Response – Impedance vs. Frequency
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BOSE Professional Systems Division
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Active equalisation for the LT MB24-III loudspeaker can be provided by
using a Bose controller or by using the ControlSpace ESP- 88 engineered
sound processor.
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TECHNICAL DATA SHEET
Driver complement:
Two 305mm (12”) low-frequency drivers built into a proprietary acoustic
enclosure.
Dimensions:
648mm x 508mm x 714mm (DxWxH)
(25.5”x 20”x 28.1”)
Construction features:
13-ply, marine-grade, Baltic birch enclosure with 16 stainless steel hang
points and a powder-coated, stainless-steel grille.
Weight:
59kg (129lb)
Hang points:
Sixteen steel threaded inserts – 4 top, 4 bottom, and 4 on each side
– allow for easy rigging. The threaded inserts are SAE 3/8 - 16 thread,
with at least 18 usable threads.
Rigging:
Obtain your mounting system from a reputable manufacturer. Select
a system design that works for your loudspeaker of choice and its
intended use. Always have a licensed professional engineer review the
design and fabrication for structural integrity and safety in the intended
application.
Shipping weight:
67kg (147lb)
Finish:
Each loudspeaker is manufactured with a textured black polyurethane
finish and contoured, powder- coated, stainless steel grille. Both cabinet
and grille can be painted to match the surroundings.
Connectors:
Two Neutrik NL4 connectors wired in parallel.
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NL4 Wiring Diagram:
Parallel
Discrete
Mechanical Diagram:
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Engineers’ and architects’ specifications
Replacement parts
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.
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.
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.
How our loudspeakers are measured
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.
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Technical literature
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
PANARAY LT Reference Guide. Available at pro.bose.com
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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.
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.
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.
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Product codes
MB24 – Black
MB24 – White
PC 040175
PC 040706
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.