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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
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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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6: Attaching the Grills
The speakers are shipped with the grill installed.
The purpose of the grill is to protect the units. The grill may be removed and re-attached as necessary.
7: Maintenance
• W hen d oi ng a ny mai nte na nc e, w ipe t he s urf ac e of t he ca b inet wit h a dry c lot h t o r e move dus t. Da mp cl ot h or cl e ani ng
paper may dull the finish on the cabinet surface. Do not use volatile liquids such as benzene, paint thinner, alcohol, etc,
and do not spray insecticide near it.
• If dust gets into the grill netting, use a vacuum cleaner to remove it. In doing so, adjust the suction power of the
vacuum cleaner so that it does not suction too strongly. Furthermore, do not wash the grill in water. The grill may sag
or its color may become uneven.
• If the surface of the speaker unit becomes dusty, use a soft, dry calligraphy brush or a paint brush to carefully sweep the
dust away. Never use a damp cloth.
•The speaker system is a durable consumer good. In particular, the edges of the woofer, which support rapid movement
of the paper cone, undergo a great level of stress, and there is a limit to the number of years of its practical use. Also,
the s pea kers ' li fes pan ma y be s hor tene d b y the effe cts of te mper at ure, h umi dit y or ultr a-vi olet ra diat ion. Ple ase a voi d
exposing the speaker to strong lighting such as from lighting equipment or direct sunlight and avoid placing the
speakers in high temperatures such as near the air conditioner exhaust pipe or a heat radiator.
8: Specifications
Type 3-way Bookshelf
Units used
Impedance 6 Ω
Allowable input 200 W (RMS)
Output sound pressure
level
Frequency response 45 Hz – 40 KHz (-6 dB)
Crossover frequencies 400 Hz, 3800 Hz
Dimensions ( W x H x D) 362 x 597 x 298 mm
Weight 21.8 kg
30 cm pure pulp cone woofer 2213H
100 mm titanium diaphragm MF 904
25 mm pure titanium dome AW025
93 dB (2.83 V/1m)
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