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Acoustical Specifications and Wiring
LT 4402
®
-III Loudspeaker Product Description
The Bose
®
Panaray
®
LT 4402
®
-III loudspeaker is a mid/high-frequency device designed for
medium to long throw distances. The LT 4402-III loudspeaker offers a 44˚ horizontal by 38˚
vertical dispersion pattern which is ideal for highly reverberant spaces.
When arrayed correctly, LT 4402-III loudspeakers behave sonically as a large, single source
of sound energy. This coherent wavefront provides full fidelity and even-coverage at critical
mid- and high-frequencies throughout the coverage area of the array.
Each Panaray LT 4402-III loudspeaker uses two V2 mid-frequency drivers and a 1.4" com-
pression driver mounted on a 40˚H x 40˚V constant directivity waveguide.
The LT 4402-III loudspeaker can be operated in passive or bi-amplified modes.
• In passive mode, the internal passive crossover network is utilized, and a single amplified
signal is connected to the loudspeaker.
• In bi-amplified mode, the mid-frequency and high-frequency drivers are accessed through
separate pins on the Neutrik NL4 connectors.
Active equalization of the LT 4402-III loudspeaker can be provided by using the Panaray LT
4402-III EQ card or the Panaray System 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 4402-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 4402-III speaker with grille
LT 4402-III speaker without grille
LT 4402-III speaker rear
Power Handling
1
Impedance
Sensitivity
2
(at 1W @ 1m)
Maximum SPL
3
(pink noise @1m @ rated power)
Frequency Range
4
(± 3 dB)
Beamwidth
(-6dB point, average 800 - 5 kHz)
Recommended Crossover
Mid High
75W
8 Ω
106 dB SPL
128 dB SPL
Passive
140W
8 Ω
107 dB SPL
126 dB SPL
8 Ω
108 dB SPL
130 dB SPL
Bi-Amped
140W
LPF: 20 kHz
,
Butterworth
,
4th order
Internal Crossover @ 1.6 kHz
Hi
g
h Fre
q
uenc
y
Mid Frequency
HPF: 160 Hz
,
Butterworth
,
4th order
LPF: 1600 Hz
,
Butterworth
,
4th order
HPF: 1600 Hz, Butterworth, 4th order
180 Hz - 16 kHz
Horizontal: 44°, Vertical: 38°