Introduction - LD Systems LD DS21 Manuel D'utilisation

The warning triangle with lightning symbol indicates dangerous uninsulated voltage inside the unit, which may cause an
electrical shock.
The warning triangle with exclamation mark indicates important operating and maintenance instructions.
Warning! This symbol indicates a hot surface. Certain parts of the housing can become hot during operation. After use, wait for
a cool-down period of at least 10 minutes before handling or transporting the device.
Warning! This device is designed for use below 2000 metres in altitude.
Warning! This product is not intended for use in tropical climates.
CAUTION! HIGH VOLUMES IN AUDIO PRODUCTS!
This device is meant for professional use. Therefore, commercial use of this equipment is subject to the respectively applicable national
accident prevention rules and regulations. As a manufacturer, Adam Hall is obligated to notify you formally about the existence of potential
health risks.
Hearing damage due to high volume and prolonged exposure: When in use, this product is capable of producing high sound-pressure levels
(SPL) that can lead to irreversible hearing damage in performers, employees, and audience members. For this reason, avoid prolonged
exposure to volumes in excess of 90 dB.
NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC
Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment
generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause
harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If
this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and
on, the user is encouraged to try to correct the interference by one or more of the following measures:
- Reorient or relocate the receiving antenna.
- Increase the separation between the equipment and receiver.
- Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
- Consult the dealer or an experienced radio/TV technician for help.

INTRODUCTION

The LD DS21 is an all-purpose 2.1 24-bit speaker processor with outstanding sound quality, which can be easily configured via the practical
front operating panel, and conveniently edited via PC software.
The rackable device is suitable both for live use and fixed installation, and offers adjustable EQ, crossover, delay and limiter functions.
The parametric 3-band EQ of the LD DS21 offers a variable bandwidth as well as high and low frequencies. Crossover filters available for
selection include Butterworth, Bessel and Linkwitz-Riley – with slope values between 6 dB and 24 dB. The delay time for the three outputs
can be individually adjusted to values up to 12.5 ms, the limiter value for the threshold and hold time can be separately configured for the
L/R and subwoofer channels.
The operating element, which consists of an illuminated 2-row LC display and a rotary encoder, makes it possible to quickly retrieve up to
6 presets, and also offers real-time level display. The back of the device has two XLR sockets for inputs, three more XLR sockets for the
stereo L/R or subwoofer output, as well as a USB connection. Also included in delivery is a CD with editing software, a power cable and a
USB cable.
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CAUTION:
To reduce the risk of electric shock, do not remove cover (or back). There are no user serviceable parts
inside. Maintenance and repairs should be exclusively carried out by qualified service personnel.