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PANARAY®LT MB24 Series III
Modular Bass Loudspeaker
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Product Overview
The Panaray®LT MB24-III modular bass
loudspeaker is a compact, low-frequency
loudspeaker designed exclusively for use
with the Panaray LT mid/high-frequency
loudspeaker family.
The LT MB24-III integrates two 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.
Applications
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
*
LT loudspeakers can be installed outdoors under cover.
Product Information
Each Panaray LT MB24-III bass loudspeaker
uses two 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
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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*
• Optional bass array rigging accessories available
from ATM Fly Ware
®
PROFESSIONAL SYSTEMS DIVISION
Detailed Product Specifications – Acoustic
PROFESSIONAL SYSTEMS DIVISION
PANARAY®LT MB24-III
Modular Bass Loudspeaker
Information subject to change without notice www.pro.bose.com
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Additional Product Information
The Panaray®LT MB24-III loudspeaker requires equalization through the use of Bose
®
active equalization or by
using a high-pass filter and a low-pass filter. Equalization is
required for both parallel and discrete configurations.
Active equalization for the LT MB24-III loudspeaker can be
provided by using the Panaray LT MB24-III EQ card or the
Panaray system digital controller. A parametric equalizer
using a high-pass and low-pass filter can replicate the
active equalization curve below.
Recommended controller:
The Panaray System Digital Controller has a universal
power supply for worldwide use. Variants of the product
refer to the AC cord included with the product. There
are five variations.
Australia: PC 028024
Europe: PC 028022
North America: PC 028021
Japan: PC 028025
United Kingdom: PC 028023
Available EQ Cards:
MB24-III/MB4
active equalization card PC 028666
MB24-III/MB4 02
active equalization card PC 027058
Power Handling
1
Impedance
Sensitivity2(at 1W @ 1m)
Maximum SPL
3
(pink noise @1m @ rated power)
Frequency Range4 (± 3 dB)
Recommended Crossover
4 Ω
8 Ω
8 Ω
800W
400W
400W
Parallel
Discrete
Driver 1
Driver 2
40 Hz - 250 Hz
HPF: 40Hz, 4th Order
LPF: 250Hz, 4th Order
91 dB SPL
91 dB SPL
123 dB SPL
129 dB SPL (Peak)
117 dB SPL
123 dB SPL (Peak)
117 dB SPL
123 dB SPL (Peak)
94 dB SPL
Active Equalization Curve
On-Axis Response – Impedance vs. Frequency
Information subject to change without notice www.pro.bose.com
PANARAY®LT MB24-III
Modular Bass Loudspeaker
Driver complement:
Tw o 12" low-frequency drivers built into a proprietary acoustic enclosure.
Construction features:
13-ply marine-grade Baltic birch enclosure
with 16 stainless steel hang points and a
powder coated, stainless steel grille.
Hang points:
Sixteen steel threaded inserts – 4 top, 4 bottom, and 4 on each side – allow for easy rigging. The threaded inserts are SAE
thread, with at least 18 usable threads.
Rigging:
Rigging hardware for the Panaray
can be purchased from ATM Fly Ware
PROFESSIONAL SYSTEMS DIVISION
more information contact ATM Fly-Ware at
www.ATMflyware.com.
Dimensions:
25.5"D x 20"W x 28.1"H
(648 mm x 508 mm x 714 mm)
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®
LT MB24
®
.For
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:
Tw o Neutrik NL4 connectors wired in parallel.
NL4 Wiring Diagram:
Parallel Discrete
Weight:
129 lb (59 kg)
Shipping weight:
147 lb (67 kg)
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Information subject to change without notice www.pro.bose.com
PROFESSIONAL SYSTEMS DIVISION
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PANARAY®LT MB24-III
Modular Bass Loudspeaker
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.
Warranty
The Bose Panaray LT MB24-III mid/high-frequency
loudspeaker is covered by a 5-year, transferable limited warranty.
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.
Engineers’ and Architects’
Specifications
The low frequency loudspeaker shall be a multiple
driver, low-frequency system with matched active
equalization 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 25.5"D x
20"W x 28.1"H (648 mm x 508 mm x 714 mm). Its
weight shall be 129 lb (59 kg).
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.
Replacement Parts
Grille with screws, tape, logo,
fastener and spring PN 278244
Screws for grille PN 276847
Logo with tape, fastener and spring PN 276848
Input panel with molex connector PN 278245
Woofer PN 278248
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
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 equalization 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 equalization 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.
©2004 Bose Corporation, The Mountain, Framingham, MA 01701-9168 USA
CCM-000252 PC035697
Technical Literature
PANARAY LT Reference Guide
Available at www.pro.bose.com
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