Owners Manual

7
English English
BI-WIRE AND BI-AMP CONNECTION (continued):
BI-AMPLIFIED WIRING
An amplifier and speaker system are bi-amplified when one channel of an amplifier is used for high frequencies, and
one channel of an amplifier is used for low frequencies. One Bookshelf Studio Monitor Loudspeaker could use both
channels from a stereo amplifier. Selecting amplifier channels and wires better suited for different bandwidths can
produce very noticeable improvement.To wire the JBL 4309 for bi-amplification, connect the speakers according to the
following illustration.
Left
Ch
.
+ -+ -
Right
Ch
.
+ -+ -
Left
Ch
.
Right
Ch
.
Left Speaker
Amplifier 1 (LF)
Amplifier 2 (HF)
Right Speaker
Right
Ch.
Left
Ch.
Right
Ch.
Left
Ch.
High
Frequency
Connection
High
Frequency
Connection
Low
Frequency
Connection
Low
Frequency
Connection
In either case, follow the instructions for the different connector types on page 5. NOTE: For more information about
various speaker-wire and connection options, contact your local JBL dealer.
COntrOLs/aDJustMents
Although the 4309 only has a woofer and a compression driver, the advanced crossover has stepped front-panel
adjustments that let you balance the ultra-high frequency (UHF) range relative to the woofer.
You can use these controls to adjust the speaker’s sound according to your room’s acoustics or your personal taste. If
you want to return the speakers to their factory-shipped response, set the controls to “0 dB.”
As with most speakers, the 4309 has transducers whose suspensions will take several weeks to “break in” and
achieve optimum performance. During this period, the balance between woofer, and UHF trim level may change, so we
recommend that you adjust the UHF controls accordingly.
CarInG FOr YOur sPeaKers
• Wipethecabinetwithaclean,dryclothtoremovedust.Adampclothmaydullthecabinet’sfinish.Donotuse
volatile liquids such as benzene, paint thinner or alcohol on the cabinet.
• Donotsprayinsecticidenearthecabinet.
• Toremovedustfromthegrillefabric,useavacuumcleanersettolowsuction.
• Donotwashthegrilleinwater,aswatermayfadethegrille’scolorormakeituneven.
• Ifthesurfaceofthewooferconebecomesdusty,youcancarefullysweepitcleanwithasoft,drycalligraphybrush
or paint brush. Do not use a damp cloth.