The JBL Concert 521 is a 5-1/4" (130mm) two-way car audio speaker system designed for enhanced sound quality and easy installation. This installation manual provides guidance for setting up the Concert 521 speakers, which are part of the JBL by Harman product line.
Function Description:
The JBL Concert 521 is a coaxial car speaker system, meaning it integrates a woofer and a tweeter into a single unit. Its primary function is to reproduce audio within a vehicle, delivering a full range of sound from bass to treble. The system is designed to provide clear, dynamic, and powerful audio performance, making it suitable for upgrading factory car audio systems or for custom installations. The included components suggest a focus on straightforward installation and robust performance.
Important Technical Specifications:
- Speaker Type: 5-1/4" (130mm) two-way coaxial car speaker.
- Power Handling:
- RMS: 40 Watts
- Peak: 120 Watts
This indicates the speaker's ability to handle continuous and maximum power inputs, ensuring durability and consistent performance even at higher volumes.
- Sensitivity (@ 2.83V): 91 dB
A high sensitivity rating means the speaker can produce a significant amount of sound with relatively little power, making it efficient and suitable for use with various car stereos, including those with lower power outputs.
- Frequency Response: 75 Hz – 20 kHz
This range covers most audible frequencies, providing a balanced sound profile with decent bass extension and clear highs. The 75 Hz lower limit suggests a good balance for a speaker of this size, capable of reproducing mid-bass effectively.
- Impedance: 3 Ohms
A 3-ohm impedance is slightly lower than the common 4-ohm standard, which can allow the amplifier to deliver more power to the speakers, potentially resulting in higher volume and dynamic range. It's important to ensure that the amplifier or head unit used is stable at 3 ohms.
- Woofer Cone: Plus One™ Woofer Cone
This proprietary cone technology is designed to provide a larger radiating surface area than conventional cones of the same size. This results in increased bass output and improved efficiency, contributing to a more impactful and detailed sound.
- Basket Frame Design: Vented Basket Frame Design
The vented design helps to dissipate heat from the voice coil, which is crucial for maintaining speaker performance and longevity, especially during extended periods of high-power operation. It also helps to reduce air compression behind the cone, allowing for more linear cone movement and improved sound quality.
- Mounting Dimensions:
- Overall Diameter (Woofer): 5-1/8" (129 mm)
- Mounting Depth (Woofer): 1-13/16" (45 mm)
- Overall Height (Woofer): 4-1/2" (113.6 mm)
- Mounting Hole Diameter: 5/16" (7.8 mm)
These dimensions are critical for ensuring proper fitment in various vehicle applications. The relatively shallow mounting depth of 45 mm makes it compatible with a wide range of car doors and panels where space might be limited.
Usage Features:
- Coaxial Design: The integrated woofer and tweeter simplify installation by requiring only one mounting location per speaker. This design also ensures proper phase alignment between the drivers for a cohesive soundstage.
- Included Hardware: The package includes all necessary components for installation:
- (A) 2x Speakers (Concert 521)
- (B) 2x Grilles (for protection and aesthetic finish)
- (C) 8x Mounting Screws (for securing the speakers)
- (D) 8x Speed Clips (for secure mounting in various materials)
- Polarity Indicators: The speaker terminals are clearly marked with "+" and "-" to ensure correct wiring polarity, which is essential for proper sound reproduction and phase alignment within the audio system.
- Grille Installation: The grilles (B) are designed to be installed over the speakers (A) after they are mounted, providing protection from physical damage and giving a finished look. The manual illustrates how the grilles fit securely over the speaker frame.
- Mounting Flexibility: The inclusion of both screws and speed clips (D) allows for versatile mounting options, accommodating different vehicle panel materials and thicknesses. The diagram shows the screws passing through the speaker frame and into the mounting surface, secured by the speed clips on the other side if needed.
- Harman Quality: As a JBL product by Harman, the Concert 521 benefits from Harman International Industries' extensive experience and reputation in audio engineering, suggesting a commitment to quality and performance.
Maintenance Features:
- Durable Construction: The vented basket frame design and robust materials used in the Plus One™ woofer cone contribute to the speaker's durability and long-term performance, reducing the need for frequent maintenance.
- Protective Grilles: The included grilles (B) serve as a primary maintenance feature by protecting the delicate speaker cone and tweeter from accidental damage, dust, and debris, which can degrade sound quality and speaker lifespan.
- Heat Dissipation: The vented basket design helps manage heat, preventing thermal overload of the voice coil, which is a common cause of speaker failure. This passive cooling mechanism extends the speaker's operational life.
- Warning for California Residents: The product includes a warning regarding Proposition 65 (Cancer and Reproductive Harm - www.P65Warnings.ca.gov), which is a standard disclosure for products sold in California and indicates potential exposure to certain chemicals. This is a regulatory compliance feature rather than a direct maintenance feature, but it informs users about potential material considerations.
In summary, the JBL Concert 521 is a well-engineered 5-1/4" coaxial car speaker system designed for car audio enthusiasts seeking an upgrade with a focus on clear sound, robust power handling, and straightforward installation. Its technical specifications and design features aim to deliver a balanced and dynamic audio experience within the vehicle environment.
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