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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.
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 Acoustical Specifications
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.
LT MB24-III with grille
LT MB24-III without grille
LT MB24-III rear
Power Handling
1
Impedance
Sensitivity
2
(at 1W @ 1m)
Maximum SPL
3
(pink noise @1m @ rated power)
Frequency Range
4
(± 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, Butterworth, 4th order
LPF: 250Hz, Butterworth, 4th order
91 dB SPL 91 dB SPL
123 dB SPL 117 dB SPL 117 dB SPL
94 dB SPL