CONTENTS

Before You Begin - Important Information

2-5

Product Range

6-7

Product Specifications

8-9

Block Diagrams

10

Speaker Cables

11

Basic Configuration

12

Bi-Amp Configuration

13

JBL Warranty and Contact Information

16

BEFORE YOU BEGIN

The MPRO speakers covered by this manual are designed for portable applications in which the speakers will be stacked directly on the floor, stage, a solid, stable platform, mounted on a tripod stand or pole mount. JBL Professional does not support suspension of the MPRO models covered by this manual nor are these models intended for fixed installation in outdoor or high moisture environments. Moisture can damage the speaker cone and surround and cause corrosion of electrical contacts. Avoid exposing the speakers to direct moisture. Keep speakers out of extended or intense direct sunlight. The driver suspension will prematurely dry out and finished surfaces may be degraded by long-term exposure to intense ultra-violet (UV) light.

MPRO speakers can generate considerable energy. When placed on a slippery surface such as polished wood or linoleum, the speaker may move due to its acoustical energy output. Precautions should be taken to assure that the speaker does not fall off a stage or table on which it is placed.

Some MPRO speaker models include a 35 mm receptacle cup to allow mounting on tripod stands. When using stands, be sure to observe the following precautions:

•Check the stand specification to be certain it is designed to support the weight of the speaker. Observe all safety precautions specified by the stand manufacturer.

•Always verify that the stand is placed on a flat, level, and stable surface and be sure to fully extend the legs of tripod type stands. Position the stand so that the legs do not present a trip hazard.

•Route cables so that performers, production crew, and audience will not trip over them pulling the speaker over.

•Do not attempt to place more than one speaker on a stand designed for a single speaker.

•Always be cautious in windy, outdoor conditions. It may be necessary to place additional weight (i.e. sandbags) on the base of the stand to improve stability.

•Unless you are confident that you can handle the weight of the speaker, ask another person to help you get it onto the tripod stand.

Hearing damage, prolonged exposure to excessive SPL

MPRO loudspeakers are easily capable of generating sound pressure levels (SPL) sufficient to cause permanent hearing damage to performers, production crew and audience members. Caution should be taken to avoid prolonged exposure to SPL in excess of 90 dB.

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JBL MPro 400 manual Contents, Before YOU Begin
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MPro 400 specifications

The JBL MPro 400 is a compact and versatile portable PA speaker designed to cater to a variety of audio needs. A part of JBL’s professional series, the MPro 400 stands out for its robust construction, exceptional sound quality, and innovative features that make it suitable for both mobile performers and fixed installations.

One of the key characteristics of the JBL MPro 400 is its high-performance woofer, which delivers powerful low frequencies, while the accompanying compression driver provides crystal-clear high frequencies. This combination ensures that whether users are delivering speeches, playing music, or engaging in live performances, the sound is balanced and rich. The speaker has a frequency response that spans from 55 Hz to 20 kHz, enabling it to reproduce a wide range of audio content effectively.

The construction of the MPro 400 is another impressive feature. It is housed in a rugged, multi-ply hardwood enclosure that not only enhances durability but also minimizes unwanted resonance. This quality construction makes the speaker suitable for outdoor events and harsh environments. The cabinet design includes integrated handles that make transportation easy, while the built-in pole mount allows for various setup configurations.

Technology-wise, JBL has incorporated a passive crossover system in the MPro 400, helping to ensure that audio signals are effectively directed to the appropriate driver. This results in better overall sound clarity and definition, crucial for performances that require precise sound reproduction.

The speaker also comes equipped with multiple input options, including standard XLR and TRS jacks, making it compatible with a variety of audio sources, from mixers to musical instruments. The MPro 400 is designed for flexibility, catering to performers, DJs, and even as part of a larger PA system.

Additionally, the MPro 400 is designed with thermal protection, which helps prevent damage from overheating during extended use. This feature ensures that users can rely on consistent performance, regardless of the duration or intensity of their events.

In summary, the JBL MPro 400 is an exceptional portable PA system that combines durability, sound quality, and user-friendly features, making it an ideal choice for audio professionals and enthusiasts alike. Whether used in small venues, outdoor events, or as part of a larger sound setup, the MPro 400 promises performance that meets the highest professional standards.
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