JBL 4338 User Manual


15 Inch 3-Way Studio Monitor

Model 4338

Owner's Manual

Model 4338 is a new member in the JBL4300 series of 15-inch 3-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.

JBL Incorporated

Studio Monitor Model 4338

1: Introduction

Thank you for purchasing the JBL 3-Way Studio Monitor 4338.

In order to better understand and correctly use this product, please thoroughly read this Owner's Manual before using 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 insufficient packing.

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.


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 HF (high-frequency) unit. Set the 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


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 4338 support bi-wiring and bi-amping configurations. Follow the instructions below for each type of connection method:

I. Single Wire Connection Using One Set of 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 Connection 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.

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