2
INTRODUCTION
Figure i.4. Air absorption for 30 degrees C at 100 meters
In addition to weather correction, the LD-3’s unique ability
to compensate for low to mid-low frequency build-up allows
the user to ne-tune each channel driving an M Series array.
Set the type of loudspeaker being used and the number of
cabinets in the array, and the LD-3’s stored presets do the
rest.
Figure i.5 is an example of a correction made to a MILO
array with eight loudspeakers. By applying this correction
the result is an incredibly at system response across a
wide range of frequencies.
Each of the LD-3’s two master channels consists of a
Master Input section, a dedicated subwoofer output,
and three outputs to required control. Three Sends and
four Insert/Returns provide the control to route the signal
and incorporate additional signal processing, such as
parametric equalization.
The Master Input section provides individual channel Gain
adjustment from –12 to +6 dB, an illuminated Mute switch,
Signal/Clip indicator, and a switchable High-Pass Filter
(0, 80, or 160 Hz) for boundary correction or optimizing
crossover to subwoofers. Master environmental controls
include Temperature (0° to 45° C), Altitude (switchable in
three ranges: 0-800, 800-2200, and 2200+ m) and Relative
Humidity (10 to 100%).
Individual outputs provide Gain trim from –6 to +6 dB,
Signal/Clip indicator, an illuminated Mute switch, illuminated
Send/Return Insert switches, and Distance controls to
dene the throw from each sound system branch to its
audience coverage area up to 150 meters (492 feet).
The LD-3’s dedicated subwoofer control sections feature
Polarity switches, Gain trim from –6 to +6 dB, mute, Signal/
Clip/Mute indicator, and Send/Return Insert switches.
In addition, a high-quality Low-Pass Filter is supplied,
switchable to 0, 55, or 80 Hz.
NOTE: While each of the LD-3’s output fully
independent channels can be used to divide
a main system into subsystems, they can also be
used to control downll, front ll, and delay systems,
allowing independent signal levels.
In addition to its sophisticated environmental and array
control functions, the LD-3 can integrate different types of
Meyer Sound self-powered loudspeakers into a cohesive
system, while maintaining signal integrity for long cable
paths.
The LD-3 occupies two standard 19-inch relay rack spaces.
Flash memory for future expansion is built in, and all input
and outputs are electronically balanced and utilize XLR
(A-3) type connectors. The AC inlet is an IEC standard male
connector, protected with
a 250 mA 250 V fuse, and
switchable in the ranges of
105-125 and 210-250 VAC.
Information and specications
are applicable as of the date
of this printing. Updates and
supplementary information
are posted on the Meyer
Sound web site at:
www.meyersound.com
You may contact Meyer
Sound Technical Support at:
Tel: +1 510 486.1166
Fax: +1 510 486.8356
Email: techsupport@
meyersound.com
Figure i.5. Correction needed shown with eight MILO loudspeakers at 35 meters
