Bose LT Series III, Bose Panaray Loudspeakers manual LT 9702-IIILoudspeaker Product Description

Acoustical Specifications and Wiring

LT 9702®-III Loudspeaker Product Description

The Bose® Panaray® LT 9702®-III loudspeaker is a mid/high-frequency device designed for shorter throw distances. The LT 9702-III loudspeaker offers an 92º horizontal by 61º vertical dispersion pattern which is the broadest beamwidth of all the LT loudspeakers.

When arrayed correctly, LT 9702-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 9702-III loudspeaker uses two V2 mid-frequency drivers combined with a 1.4" compression driver mounted on a 90˚H x 70˚V constant directivity waveguide.

The LT 9702-III loudspeaker can be operated in a passive or bi-amplified mode.

• 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.

LT 9702-III speaker with grille	Active equalization for the LT 9702 III loudspeaker can be provided by using the Panaray
	LT 9702-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 9702-III speaker without grille

LT 9702-III speaker rear

LT 9702-III Acoustical Specifications

	Passive	Bi-Amped
		Mid	High
Power Handling1	140W	140W	75W
Impedance	8 Ω	8 Ω	8 Ω
Sensitivity2 (at 1W @ 1m)	104 dB SPL	105 dB SPL	104 dB SPL
Maximum SPL3	126 dB SPL	127 dB SPL	123 dB SPL
(pink noise @1m @ rated power)
		Mid Frequency
Recommended Crossover		HPF: 160 Hz, Butterworth, 4th order
	Internal Crossover @ 1.6 kHz	LPF: 1600 Hz, Butterworth, 4th order
		High Frequency
		HPF: 1600 Hz, Butterworth, 4th order
		LPF: 20 kHz, Butterworth, 4th order
Frequency Range4 (± 3 dB)		180 Hz - 16 kHz
Beamwidth		Horizontal: 92°, Vertical: 61°
(-6dB point, average 800 - 5 kHz)

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 loud- speaker terminals corresponding to the power handling of the loudspeaker. The loudspeaker must show no visible damage or mea- surable 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.

22