Handleiding JBL LSR308 (pagina 7 van 22) (Engels)

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LSR310S Subwoofer - The subwoofer weighs 19 kg (42 lbs.) Unpacking the subwoofer does not require you lift the

subwoofer. However, you will need to rotate the subwoofer in the carton. If you are unable to perform the following

steps without assistance, please request help from another person.

• Remove the outer shipping carton, if one exists.

• Place the carton on the oor with the bottom facing upward.

• Open the bottom aps of the carton and remove any protective packing materials from the bottom of the

subwoofer. Open the bag that protects subwoofer, exposing the subwoofer’s four feet.

• Gently rotate the carton so the bottom of the carton is facing the oor and the four feet of the subwoofer are

in contact with the oor.

• Gently lift the carton allowing the subwoofer and protective packing materials to slide out of the carton and

remain on the oor.

• Remove the protective packing materials and documentation from the top of the subwoofer. Save the

cartons and use the above procedure in reverse when you want to repack the units for shipment.

PLACEMENT

3 Series speakers are designed to deliver exceptional imaging in any room. To get the most out of your speakers,

follow these recommendations:

• Locate the four self-adhesive rubber pads supplied with LSR305 and LSR308 speakers. Position and attach

these to the bottom surface of the speaker close to each corner.

• Position each LSR305 and LSR308 speaker in a vertical orientation with the tweeter on the top.

Vertical orientation eliminates phase shift and cancellation of frequency response that occurs when the

distance of the woofer to the ear is different from the distance of the tweeter to the ear.

• Angle the speakers so the high-frequency transducer in each speaker is aimed directly towards the ear

of the listener.

• Ideally, LSR305 and LSR308 Series speakers should be placed on suitable speaker stands, rather than on

the work surface. This will reduce resonance and deterioration of low frequency performance that occurs

through the speaker’s mechanical coupling with the work surface.

• For optimum imaging, the left speaker and the right speaker should be placed symmetrically in the room,

so each speaker is the same distance from adjacent walls and reective surfaces.

• The speakers should be placed so the position of the listener and the two speakers form an equilateral

triangle. Adjusting the distance between the speakers will affect the quality of bass heard at the listening

position. You can experiment with speaker placement to nd the placement that produces the preferred

bass response, imaging and when listening to stereo material, produces a strong “phantom” center in

which vocals and some instruments seem to originate from a point between speakers.

• The listening distance can be determined according to your preference, the acoustics of your room and the

maximum SPL (Sound Pressure Level) you want to hear at the listening position. You can nd the speaker’s

maximum SPL at 1 Meter in the Specications Section at the end of this manual. Each doubling of listening

distance will reduce the SPL at the listening position by 6 dB in an acoustically absorptive room, but only 3

or 4 dB in an acoustically reective room.

LSR310S Subwoofer placement: The low frequency driver of the 310S is mounted on the bottom panel of the

subwoofer. Before placing the subwoofer, make sure the position on the oor is free of any large objects that can

interfere with or damage the woofer. In a stereo system, The LSR310S Subwoofer should be placed directly on the

oor, located between the Left and Right Speakers. In a surround sound system, the subwoofer can be located

between the Left and Center or between the Right and Center channel Speakers. The distance of the subwoofer

from the listening position can be adjusted to produce the optimum balance of bass in the system. Placing the

subwoofer close to a wall or in a corner generally will increase the amount of bass heard in the room. Experiment to

determine the Subwoofer placement that produces the best balance and quality of bass in the system.

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