BOSE PANARAY LT MB24-III modular bass loudspeaker ® ® 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. ® 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. ® * PANARAY LT MB24 series III loudspeakers LT loudspeakers can be installed outdoors under cover. Please contact Bose for additional details. ® 1 BOSE Professional Systems Division ® of 4 BOSE PANARAY LT MB24-III modular bass loudspeaker ® ® 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. ® ® Active equalisation curve On-Axis Response – Impedance vs. Frequency 2 of 4 BOSE Professional Systems Division ® 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. ™ 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. ® NL4 Wiring Diagram: Parallel Discrete Mechanical Diagram: 3 of 4 BOSE PANARAY LT MB24-III modular bass loudspeaker ® ® 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. ® ® 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 ® 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. ® ® 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.