Velodyne Acoustics Velodyne DLS Series DLS-3750 user manual

Summary of the content on the page No. 1

"If you know subwoofers, you know about Velodyne."
- Corey Greenberg
Home Theater Technology/February 1995
"It delivered room-shaking bass and dramatically demonstrated the
effectiveness of a single subwoofer placed to one side of the room."
- Julian Hirsh
DLS-3500/DLS-3750/
Stereo Review, January 1997
DLS-4000
"Notes were distinct, not blurry".
Home Theater, May 2002
Owner's Manual
Other Velodyne Subwoofer Products:
CHT Series SPL Series
CHT-8 SPL-800
CHT-10 SPL-1000
CHT-12 SPL-1200
CHT-15 SPL-

Summary of the content on the page No. 2

SPECIFICATIONS DLS-3500 DLS-3750 DLS-4000 CAUTION Cabinet (H,W,D) 15" x 12" x 18" 16.25" x 15" x 21" 18" x 15" x 21" RISK OF ELECTRIC SHOCK DO NOT OPEN Frequency Response 35Hz-140Hz 28Hz-120Hz 25Hz-120Hz (±3 dB) Caution High Pass Crossover Passive 85Hz Passive 85Hz 80Hz or 100Hz To reduce the risk of electric shock, do not remove cover (or back). No user-serviceable parts inside. (6 dB/octave slope) Refer servicing to qualified service personnel. Low Pass Crossover 40Hz -120Hz (12 dB/octave, 24

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Troubleshooting and Service Congratulations! Before seeking service for your subwoofer, please re-check all systems. Congratulations on your purchase of a Velodyne DLS subwoofer system. Following is a simple troubleshooting guide to assist you. This system represents the state of the art in low frequency reproduction. Your new subwoofer features Velodyne's exclusive DLS (Distortion Limit- 1. Verify unit is plugged in and power outlet used is active. ing System) technology that significantly imp

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Line-level inputs and outputs Placement Speaker-level inputs and outputs Signal sensing auto turn on/off with bypass option True subwoofers operate at extremely low frequencies which are primarily Variable volume control omni-directional. While it is recommended that the subwoofers be placed Selectable phase control (0 or 180 degrees) on the same plane as the satellite speakers, room and system conditions Dual staggered low-pass crossover; 12dB/octave initial, 24dB/octave often

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Caution!!! main speakers are smaller units with limited low frequency output, you may To avoid damage to your main amplifier, be sure to maintain correct wish to choose a higher frequency (such as 100-120Hz) than you would with polarity when making all connections. The correct method is to connect larger speakers which have greater low frequency output. With larger red (positive) to red and black (negative) to black. Be sure that all speakers, you might start with this control set lower, such as

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In these installations, you may bypass the internal crossover in either the Line-level Connection processor or your DLS subwoofer. In some installations, it may be beneficial to have a steeper ultimate crossover slope. To do this you can Figure 1 shows connection to a pre-amplifier's main outputs and returning use both your processor's crossover and the one internal to the DLS them to your amplifier inputs. subwoofer. You should stagger the frequencies (i.e., 120Hz sub, 80Hz processor) for be