Jbl 4312SX, 4312SXR User Manual
12 Inch 3-Way Studio Monitor
Model 4312SX
Owner's Manual
The 4312SX is an upgraded version of the classic 4312 Studio Monitor. It incorporates a new inverted dome
midr ang e driv er and a new dome high frequency driver whose response has be e n extended to 40 KHz.
JBL Incorporated
Studio Monitor Model
4312SX
1: Introduction
Than k yo u for pur chas in g t h e JBL 3-Way Studio Monitor 4312SX.
In or de r to b et t er u n de r s t a n d and corr e ct ly us e this produ c t, pl e a s e thoroug hly read t hi s O w n e r ' s M a nual b e f ore us i n g the
product.
2: Unpacking
The product should have been delivered complete in appearance and functionality. However, if you find any scratches or
defects, please directly contact the store where you purchased the product.
We recommend that you keep the original box and packing material after unpacking. Please note that if a product must be
shipped for a repair service, JBL Incorporated will not be responsible for any damage incurred during shipping caused by
insu fficie nt pa ckin g.
3: Installation
Avoid placing the monitors near power amplifiers or radiators that generate large amounts of heat, or in very humid or
dusty places, and any places exposed to direct sunlight. Also place them on a firm, solid floor.
•Settings
Start the setup using a recorded sound source that has a distinct virtual center image. Once the center point between the
speakers is obtained by measuring equal distances from the left and right speakers, adjust the distance between the
listening position and the speakers, as well as the distance between right
and left speakers, so tha t a precise center image is obtaine d.
These monitors are designed to reproduce the most accurate stereo sound
stage when the interior angle between the lines connecting from each
speaker to the listener is between 40 to 60 degrees. Additionally, it is
ideal that a distance of approximately 50 cm or more is maintained from
the left and right walls.
The center of the speaker's sound image is in the vicinity of the HF
(high-frequency) unit. Set t he speakers so that the HF unit is aligned at
ear-level. In addition, to avoid acoustical interference with the floor
surface, it is recommended that you set a sturdy base (cube or block
shaped) with a thickness of 5 – 20 cm under the speakers.
4: Connection
*Caution
When connecting the speakers to the amplifier, always do so after turning off the power. Connecting the speakers
while the power is on may damage the amplifier or the speakers.
The pos iti ve ter minal s of th e spea ker ha ve a r ed ring, and th e nega tive t ermi nals ha ve a bl ack ri ng. Be s ure t o conne ct
without mistaking the polarity. The speakers are designed so that when a positive signal is applied to the positive
terminal, the woofer mov es in the f orwa r d direct io n (p osit ive p hase o pera t ion) .
In order to safely and securely connect to the terminals, we recommend that you use the Y terminals or banana plugs on
the cable ends.
5. Attenuator Adjustment
Independent, continuous variable attenuators are used for each unit to adjust the MF (mid-frequencies) and HF (highfrequencies) levels to the speaker's woofer level. Make adjustments appropriate to the reverb in the actual room, and to
your liking. In general, f or most speakers, it takes about 1 – 2 months after initial use until the unit's vibration system
yields optimum performance. As the level balance is expected to initially change with use, we recommend that you
readjust the level accordingly.
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