Meyer Sound LD-1A User Manual

5
AC Power
AC Inlet and Voltage Select Switch
The LD-1A uses an international standard IEC 320
Mains AC inlet. This convenient rear panel receptacle
accepts many power cord types for mains outlets used
throughout the world. The LD-1A must have the correct
power cord for the AC power in the area in which it will
be used.
The LD-1A operates in two AC voltage ranges: 90 – 125 V
and 180 – 250 V, at 50 or 60 Hz. The voltage select switch
on the rear panel must be set to the proper voltage before
applying AC power. Connecting the LD-1A to a 225 V
AC source with the voltage select switch in the 90 – 125
V position could blow the fuse. Unplug the power cord
before changing the voltage select switch!
IEC 320
male power inlet
Voltage select
switch
180-250V ~
90-125V ~
AC Voltage Ranges
CAUTION:
Set voltage before
applying power.
90-125/180-250 V ~
50-60 Hz 25W MAX
CAUTION: RISK OF FIRE REPLACE WITH
T250mA - 250V FUSE
The audio outputs are muted internally during normal
power on and off, and in case of sudden loss of AC power
or unstable line voltage. This precaution prevents noise
transmission, and possible damage, to interconnected
devices.
Donít use a ground-lifting adapter or cut the AC ground pin.
To avoid electrical shock and damage to the unit, use the
power cord specified by Meyer Sound or an equivalent
that satisfies the requirements of the local safety testing
agency. Do not operate the unit if the power cables are
frayed or broken.
AC Fuse
Always disconnect the power cord before changing the
fuse. To replace the fuse, insert a flat-blade screwdriver
in the fuse cap and gently turn counterclockwise; the
fuse springs from its socket. Replace only with a 5 x 20 mm,
T 250 mA, 250 V, time-lag fuse that conforms to identical
safety agency standards. If the fuse blows again, contact
Meyer Sound for repair information.
Main Channels 1 and 2
Channels 1 and 2 are equipped to control a full-range
main system. Each channel has a Signal/Mute-Clip LED
indicator, mute switch, gain control, Mid-Hi, DS-2, and
Sub output controls, and a male XLR Loop connector.
Mute
CH 1
Sub φ
DS-2
& Sub
Crossover
DS-2 φ
Mute
Mute
Mute
Array
EQ
Lo Cut
CH 2
DS-2
& Sub
Crossover
Mute
Mute
Signal Mute-ClipSignal Mute-Clip
Master
-12
-6
-3
0
+3
+6
-9
DS-2
Mid-Hi
Sub
Array
EQ
Lo Cut
Master
Mid-Hi
-12
-6
-3
0
+3
+6
-9
-12
-6
-3
0
+3
+6
-9
-12
-6
-3
0
+3
+6
-9
-12
-6
-3
0
+3
+6
-9
Sub φ
Mute
Sub
-12
-6
-3
0
+3
+6
-9
-12
-6
-3
0
+3
+6
-9
Mute
DS-2
φ
DS-2
-12
-6
-3
0
+3
+6
-9
The Master gain control sets the channel’s overall level.
The Mute switch mutes the entire channel. The bicolored
Signal/Mute-Clip LED indicates input signal presence
and level with a variable intensity green color, and clipping
or mute with red. The Loop connector is used to send the
input signal to an auxiliary channel or to another device.
The Mid-Hi, DS-2 (mid-bass), and Sub outputs each have
a level control and mute switch. The level control modifies
the level set by the channel’s Master gain control; the
mute switch affects the Mid-Hi, DS-2, or Sub output only.
For example, the Mid-Hi output could be muted without
affecting the Loop, Sub, or DS-2 outputs. Additional
functions specific to each output are described in the
following sections.

Meyer Sound LD-1A Specifications

Audio Inputs

input impedance	10 k differential
common mode rejection ratio	> 80 dB
rf filter common mode frequency	425 kHz low-pass

Audio Outputs

output impedance	50 Ohm balanced
maximum voltage with 600 Ohm load	±22.5 Vpk
maximum current	±70 mApk

AC Power

operating voltage	90 - 125 VAC / 180 - 250 VAC
maximum power	25 Watts
fuse	5 x 20 mm, T 250 mA, 250 V, time-lag

Audio Performance

frequency response	< ±0.2 dB 20 Hz - 20 kHz
dynamic range	> 120 dB
noise floor	> -95 dBV A-weighted

Physical

height	3.45 inches
width	16.75 inches
weight	13.5 lb