DLS 4000 Subwoofer Installation and Care Guide

●Line-level inputs and outputs

●Speaker-level inputs and outputs

●Signal sensing auto turn on/off with bypass option

●Variable volume control

●Selectable phase control (0 or 180 degrees)

●Dual staggered low-pass crossover; 12dB/octave initial, 24dB/octave ultimate

Installation

Your new DLS subwoofer system provides for a number of installation options. Read all the installation information below in order to determine which installation option is best for your system. Remember to perform

all installation procedures with system power turned off.

Inputs

Your new subwoofer is equipped with both speaker-level and line-level inputs. Use the RCA/Phono type "INPUT" jacks when connecting your subwoofer to a pre-amp, signal processor, or line-level crossover. The "SPEAKER LEVEL-INPUT" jacks connect directly to the speaker outputs of a integrated amplifier or receiver. Your amplifier section will notice no additional loading effects when you use these inputs because of their high impedance.

Note:

Do not use both the RCA/Phono "INPUT" connections and "SPEAKER LEVEL-INPUT" connections simultaneously.

Volume control

This control allows you to balance the output from the subwoofer to the main speakers in your system. This control should be set to achieve similar volume level from both the main speakers and subwoofer.

Low-pass crossover

Both sets of inputs sum the left and right channels together and the resulting signal is passed through an adjustable low-pass crossover before being amplified. The crossover control allows you to adjust the upper limit of the subwoofer's frequency response from 40 to 120 Hz. The subwoofer's response will begin rolling off above the frequency you set this control to.

You should set the crossover frequency to obtain a smooth and seamless transition from the subwoofer to the main speakers in your system. If your

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Placement

True subwoofers operate at extremely low frequencies which are primarily omni-directional. While it is recommended that the subwoofers be placed on the same plane as the satellite speakers, room and system conditions often dictate otherwise. Keep in mind that frequency response and output level can be drastically influenced by placement, depending on the acoustic properties of the listening room. Typically, the optimum location for a subwoofer is tucked away in a corner of your listening room. This location will usually offer the greatest output levels and optimum low frequency extension. The worst location for a subwoofer is typically far away from any walls, and close to the center of your room. Avoid these locations when possible. When using a pair of Velodyne subwoofers in stereo, it is preferable to place each subwoofer by the satellite of the same channel. Typically, a minimum distance of 4 to 5 feet from your TV to the subwoofer will be adequate to avoid any magnetic interference.

Caution!

This subwoofer has electronics built into the cabinet. Do not place the cabinet next to sources of heat such as furnace registers, radiators, etc. Do not place the unit near sources of excessive moisture, such as evaporative coolers, humidifiers, etc. The power cord should be routed in such a way that it will not be walked on, pinched, or compressed in any way that could result in damaging the insulation or wire.

Care of Your DLS Subwoofer

Do not use any harsh detergents or chemicals to clean the cabinet. Abrasives, detergents, or cleaning solutions may damage the finish on the cabinet. We recommend using a damp cloth to clean the cabinet.

During normal conditions, the subwoofer may be left on continuously without any problems. The unit is equipped with a signal sensing circuit that will automatically turn on the unit when a signal is present at the inputs and turn off the unit after several minutes when there is no longer any signal at the inputs.

If you plan to leave the unit unused for an extended period of time, we recommend that you turn off the unit by the master power switch on the rear panel.

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DLS-3500, DLS-4000, DLS-3750 specifications

Velodyne Acoustics, renowned for its commitment to high-performance audio solutions, has developed a lineup of sophisticated subwoofers that stand out for their exceptional sound quality and innovative technologies. Among these models are the DLS-3750, DLS-4000, and DLS-3500, each designed to cater to different listening preferences while maintaining the brand’s hallmark of excellence.

The DLS-3750 is engineered for those who desire robust bass in a compact package. This model features a 12-inch driver combined with a built-in amplifier that delivers an impressive 375 watts of continuous power and peaks up to 750 watts. One of the standout technologies in the DLS-3750 is its digital signal processing, which ensures precise control over the frequencies and optimizes performance to minimize distortion. The adjustable crossover and phase control further allow users to tailor the output to best suit their specific acoustical environment.

Moving up the lineup, the DLS-4000 provides an even more powerful option with a 12-inch driver and a peak power output that reaches 1000 watts. The DLS-4000 integrates the same advanced DSP technology as the 3750 but enhances it with an upgraded enclosure design that improves resonance control. This results in a richer bass experience with greater depth and clarity, making it ideal for both home theater enthusiasts and audiophiles who demand high fidelity in their sound reproduction. Its user-friendly interface allows for seamless integration with existing audio systems.

Lastly, the DLS-3500, with its 10-inch driver, is tailored for listeners who may have space constraints but still desire quality high-performance bass. Despite its smaller footprint, the DLS-3500 doesn’t compromise on power, delivering a peak performance of up to 700 watts. It features adjustable tuning options to help achieve an optimal sound tailored to the specific acoustic characteristics of any room. The DLS-3500 also utilizes advanced driver materials that deliver more accurate sound reproduction throughout the low-frequency range.

In summary, the Velodyne Acoustics DLS subwoofer series exemplifies cutting-edge design and engineering. With their powerful amplification, innovative DSP technology, and customizable sound features, the DLS-3750, DLS-4000, and DLS-3500 provide compelling options for consumers seeking to elevate their audio experience. Each model, while differing in specifications, shares the core values of performance and reliability that Velodyne is known for, making them exceptional choices for a variety of audio enthusiasts.