Bi-Amplified Wiring; Controls/Adjustments; Caring For Your Speakers - JBL 4309 Manuel Du Propriétaire

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 Speaker
High
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.
Amplifier 1 (LF)
Left Left Right Right
Ch. Ch . Ch . Ch.
+ - + -
Left Left
Ch .
Ch.
+ - +
Amplifier 2 (HF)
7
Right Speaker
Frequency
Connection
Right
Right
Frequency
Ch.
Ch .
Connection
-
High
Low