System Setup and Adjustment, Electronic Crossover

Observe the following color-codes: Left+: White

Left–: White with black stripe

Right+: Gray

Right–: Gray with black stripe

4.If you are connecting your Decade Series amplifier to a source unit with output voltage higher than 4V, connect the output signal wires of the source unit to the floating ground factory head unit inputs. Because the inputs have an impedance of 100K ohms, this connec- tion will provide the best noise-free performance possible.

System Setup and Adjustment

Electronic Crossover

The electronic crossover(s) in your Decade Series amplifier can be selected as a 12dB/oct. high-pass filter at 120Hz (HPF), a 12dB/oct. low-pass filter at 80Hz (LPF) or it can be defeated (FLAT).

Setting Input Sensitivity

Proper input sensitivity control settings on Decade Series power amplifiers are critical to ensure optimum performance, low noise levels and maximum system reliability. As a general rule, controls at the front end of a system (source, equal- izers and other processors) should be set as high as possible with the amplifier input sensitivity set as low as possible while still providing adequate volume lev- els. Using a high signal level and a low sensitivity setting will help keep back- ground noise in the system to a minimum.

Initially, turn the input sensitivity GAIN control to its minimum (counter-clock- wise) position.

1.Reconnect the (–) negative lead to your vehicle’s battery. Apply power to the audio system and play a favorite music track from a CD or tape. (Note: After the source unit is on, the JBL badge (on the top panel) will illumi- nate, indicating the amplifier is on. If not, check the wiring, especially the remote connection from the source unit. Also refer to “Troubleshooting” on page 7.)

2.On the source unit, increase the volume control until it is approximately 3/4 of its maximum output level. Slowly increase the Input Sensitivity control (clockwise) toward three o’ clock and, at the same time, listen to the quality of the reproduced sound.

At some point, you’ll hear distortion on the music peaks. Stop the adjust- ment and turn it back slightly. This is the maximum undistorted output level of your system, and should not be exceeded during use.

3.After adjusting the level of the main speakers in your system, you should adjust the remaining channels (if you are using a DA3504 or a multi-amp system) for the desired system bal- ance. You’ll find this easiest to do by adjusting the channels in the following order: 1) front speakers, 2) rear speak- ers, 3) subwoofer. Elaborate, multi- channel systems may be too complex to adjust. Your local JBL installation specialist is the best person to help with such adjustments.

DA6502, DA4002, DA1002, DA3504 specifications

JBL has built a reputation for producing high-quality audio equipment, and their series of amplifiers, including the JBL DA3504, DA1002, DA4002, and DA6502, exemplifies this commitment to excellence. Each model caters to different needs and preferences, making them versatile options for audio enthusiasts.

Starting with the JBL DA3504, this 4-channel amplifier is designed to deliver powerful performance in a compact package. It boasts an output power of 50 watts RMS per channel at 4 ohms, ensuring that it can drive a variety of speakers efficiently. The DA3504 features a high-pass and low-pass filter, allowing users to customize sound output to match their audio preferences. Its sleek design and built-in LED indicators enhance both functionality and aesthetic appeal, making it a great addition to any audio system.

Moving on to the JBL DA1002, this amplifier is a 2-channel model that focuses on delivering exceptional sound quality. It offers 50 watts RMS per channel, ideal for smaller audio setups. The DA1002 is notable for its simple installation process and lightweight design, making it accessible for users who may not be audio experts. This amplifier also includes a variable low-pass filter, allowing users to enhance bass response and create a more immersive listening experience.

The JBL DA4002 is a powerful 2-channel amplifier that provides an output of 100 watts RMS per channel. This model is designed for those looking for higher output and is perfect for larger audio systems or when more power is needed to drive speakers effectively. With its durable construction and advanced circuitry, the DA4002 ensures reliable performance and minimal distortion, preserving audio quality even at higher volume levels.

Lastly, the JBL DA6502 stands out as a 2-channel powerhouse with an impressive 150 watts RMS per channel output. Designed for audiophiles who demand robust sound performance, the DA6502 integrates advanced features such as variable bass boost and a crossover network. Its exceptional build quality and efficient cooling system make it suitable for extended use without overheating, ensuring that every listening session is enjoyable.

Collectively, these JBL amplifiers – DA3504, DA1002, DA4002, and DA6502 – offer a range of features and output capacities suitable for various audio setups. Whether for casual listening or serious audio applications, JBL amplifiers continue to deliver reliable performance and impressive sound quality, making them a top choice for many audio enthusiasts.