JBL 4348 User Manual

15 Inch 4-Way Studio Monitor

Model 4348

Owner's Manual

Model 4348 is a new member in the JBL4300 series of 15-inch 4-way studio monitor systems.
With the introduction of the advanced technology fostered by the development of "Project K2 S9800", together with
the inline unit layout for realizing a brilliant sound image positioning, a new generation bi-radial horn that
constructs accurate sound field without requiring an acoustic lens, and the slim and advanced cabinet that makes
these technologies possible, the system is a result of innovative system engineering that fuses tradition and
revolution.
This is a new generation monitor speaker system that enables a full-spec monitoring of high-bit/high-sampling
digital source.

Studio Monitor Model

4348

JBL Incorporated

1: Introduction

Than k yo u for purchasi n g t h e JBL 4-Way Studio Monitor 4348.
In or de r to bet t er un dersta n d and c or r e ct ly us e this produc t, pl ease t h oroug hl y rea d t hi s O w n e r ' s M a nual b ef ore using t h e
product.

2: Unpacking

The product should have been delivered complete in appearance and functionality. However, if you find any scratches or
defects, please dir ectly 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 packi n 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, soli d 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 that a precise center image is obtained.
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 UHF
(ultra-high-frequency) unit. Set the speakers so that the UHF unit is
aligned at ear-level. In addition, t o avoid acousti cal 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 two groups of input terminals on the 4348 support bi-wiring and bi-amping configurations. Follow the instructions
below for each type of connection method:

I. Single Wire Connectio n Using O ne S et o f Speaker Cables

Connect to either the upper or the lower terminals, leaving the short wires
with the gold plated ring sleeves connected.

II. Bi-wire Connect ion Using Two Sets of Speaker Cables

Remove the short wires with the gold plated ring sleeves, and connect the
high-frequency and the low-frequency cables to their respective terminals.