Bose LT Series III LT MB24 Loudspeaker Product Description, LT MB24-IIIAcoustical Specifications

Acoustical Specifications and Wiring

LT MB24 Loudspeaker Product Description

The Panaray® LT MB24-III modular bass loudspeaker is a compact low-frequency loud- speaker 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.

The LT MB24-III is fully compatible – acoustically and aesthetically – with LT mid/high- frequency loudspeakers. The LT MB24-III loudspeaker is the ideal bass extension solution for any of the LT mid/high-frequency loudspeakers.

LT MB24-III with grille	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.
	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 with presets for each Panaray
	speaker and combination of speakers. A parametric equalizer can replicate the active
	equalization curve on the following page, along with a high-pass filter and low pass filter as
	shown.

LT MB24-III without grille	LT MB24-III Acoustical Specifications
		Parallel		Discrete
				Driver 1	Driver 2
	Power Handling1	800W		400W	400W
	Impedance	4 Ω		8 Ω	8 Ω
	Sensitivity2 (at 1W @ 1m)	94 dB SPL		91 dB SPL	91 dB SPL
	Maximum SPL3	123 dB SPL		117 dB SPL	117 dB SPL
	(pink noise @1m @ rated power)
	Recommended Crossover		HPF: 40Hz, Butterworth, 4th order
			LPF: 250Hz, Butterworth, 4th order
	Frequency Range4 (± 3 dB)			40 Hz - 250 Hz
LT MB24-III rear	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 mea- sured 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 1 watt, as referenced to the nominal impedance, and the level measured at 1meter. Resulting graph is smoothed by 0.05 octave-band.

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