JBL 8340 User Manual.pdf

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8340High Power Cinema Surround

Speaker for Digital Applications

Professional Series

Key Features:

Frequency range: 45 HZ - 18 kHz

High Sensitivity: 96 dB (1 W, 1 m)

High Power Handling Capability: 150 watts pink noise

Similar size enclosure to the successful 8330, allowing simple installation into existing systems

In-cabinet mounting hardware accepts JBL 2502 wall brackets for fast installation

D Crossover switchable between ISO2969 cinema surround rolloff and flat response

Uniform horizontal and vertical coverage

Approved by Lucasfilm, Ltd. for T H X® installations

The 8340 Cinema Surround Speaker offers high power handling capability, high sensitivity and extended bass response in an extremely compact enclosure. The two-way 8340 incorporates the proven reliability and performance features found in the industry standard JBL 8330 Surround Loudspeaker System and is designed to accurately reproduce the extended dynamic

range and frequency response characteristics required by digital sound formats.

The 8340 incorporates a highpower, long-throw 250 mm (10 in) low frequency transducer which extends the frequency response to below 50 Hz. The low frequency driver features an SFG™ (Symmetrical Field Geometry) magnet structure which lowers second harmonic distortion to inconsequential levels. The high frequency section incorporates

a 19 mm (¾ in) compression driver/ horn combination capable of very high output power. The true constant directivity coverage (100° horizontal by 60° vertical), combines with a very smooth off-axis design in the crossover range to provide the same sound character to all seats.




Frequency Range (— 10 dB): 45 Hz - 18 kHz







Power Rating¹:

150 watts continuous pink noise




Sensitivity²: 96 dB, 1 watt (2.83 V) at 1 meter (3.3 ft)






8 ohms








Crossover Frequency:









Downward Firing Angle: Nominal 15° when mounted flush on back panel



High Frequency Contour Switch: 2 positions: Flat and IS02969 Curve X surround contour




Polarity: EIA, red = “ + ”






L O W F R E Q U E N C Y L O U D S P E A K E R :








Nominal Diameter:

280 mm (10 in)







Voice Coil Diameter: 50 mm (2 in)
















Nominal Diameter: 19 mm (¾ in)







Voice Coil Diameter: 25 mm (1 in)







Characteristics: Ferro-fluid cooled







Coverage Pattern:

100° H x 60° V





















Black vinyl








Grille Color:

Dark gray










Dual five-way binding posts




539 mm x 481 mm x 304 mm




H x W x D 21¼ in x 19 in x 12 in







System Net Weight: 50 Ibs.








Raring based on test signal


IEC filtered random noise with

a peak-to-average


of 6 dB, two hours dnration.


Sensitivity is based on a swept

500 Hz to 2.5

kHz signal for an

input of 2.83 V

@ 8


JBL continually engages in research related to product improvement. New marerials. production methods, and design refinements are introduced into existing products without notice as a routine expression of that philosophy. For this reason. any current JBL product may differ in some respect from its published description. but will always equal or exceed the original design specifications unless otherwise stated

8340 High Power Cinema Surround Speaker for Digital Applications

Very high power handling (150 watts continuous, with peaks of 600 watts) gives the 8340 the extended dynamic range required by digital soundtracks. This power headroom also provides additional reliability.

The 8340 incorporates a true IS02969 cinema surround rolloff curve, which is switchable to flat response for installations where the speaker is mounted behind any material or curtaining which can block high frequencies.

The same width and style cabinet as the 8330 allows installation into existing systems. In-cabinet mounting hardware accepts Omnimount® or wall brackets for fast installation. Built to traditional JBL standards of precision, the 8340 will continue to deliver exceptional performance year after year, without special care or attention.

JBL Professional

8500 Balboa Boulevard, PO. Box 2200

Northridge, California 91329 U.S.A.

A Harman international Company


CRP 5M 6 / 9 6