8
Measurement and System
Integration
Measurement and correction tools are required to
assemble a complete sound system, particularly when
the venue requires precise array design, delay systems,
or compensation for significant reverberation. We
recommend using the Meyer SIM® System II Sound
Analyzer
and CP-10 Parametric Equalizer to
• assist the process of choosing and configuring
speakers;
• measure propagation delays between subsystems
to set the correct polarity and delay times;
• measure and equalize variations in frequency
response caused by the acoustical environment
and the placement and interaction of speakers.
We recommend using the Meyer LD-1A Line Driver to
integrate different types of Meyer self-powered speakers
into a complete system. The LD-1A has two channels
equipped to control a main system and six auxiliary
channels for down-fill, front-fill, and delay systems.
The LD-1A maintains signal integrity for long cable
paths and provides the following useful functions:
• The Lo Cut switch activates a high-pass filter
(160 Hz, –12 dB/oct, Q = 0.8) that performs a
crossover function for the Mid-Hi output.
• The Array EQ switch activates a filter (6 dB cut
at 220 Hz, 0.6 octave bandwidth) to equalize
horizontal arrays of 3 to 5 MSL-4s.
• The DS-2 & Sub Crossover switch (channels 1 and
2 only) activates a crossover network optimized
for the DS-2P when used with the 650-P. With the
switch in, frequencies below 80 Hz are sent to the
Sub output (for the 650-P), and above 80 Hz to the
DS-2 output. When the 650-P is used without the
DS-2P, the switch should be out, which sends a
full-range signal to both the DS-2 and Sub outputs.
• The DS-2
φ
and Sub
φ
switches (channels 1 and 2
only) toggle the polarity for the DS-2 and Sub
outputs.
• The Mid-Hi, DS-2, and Sub outputs (channels 1
and 2 only) each have their own gain control and
mute switch.
POLARITY NOTE:
The polarity for Meyer self-powered
speakers may be reversed using the input polarity switch
on the user panel. The LD-1A also allows polarity reversal
with the
DS-2
φ
and
Sub
φ
switches for speakers
connected to the DS-2 and Sub outputs. When making
polarity decisions in applications that include the LD-1A,
check the state of all polarity switches.
Complete Systems
Meyer Speaker Types
The following Meyer speakers are mentioned in the
example applications.
MSL-4
Self-powered mid-hi speaker
DS-2P
Self-powered mid-bass speaker
PSW-2
Self-powered subwoofer
650-P
Self-powered subwoofer
The Meyer self-powered speakers listed above have a
loop
connection to send the input signal to another
speaker. Full-range signals can be applied to all Meyer
self-powered subwoofers because they have built-in
active crossovers that filter mid-hi frequencies.
Flown MSL-6 and MSL-4;
650-P on the Floor
This example shows a large concert system controlled by
the LD-1A consisting of two rows of two MSL-6s (lower
row at 10
°
to the top row), one row of two MSL-4s with
a 30
°
horizontal splay angle (hung below lower MSL-6 at
20
°
), and 650-Ps on the floor. The diagram on the next
page displays connections for half of a complete system;
channels 2, 4, and 6 can be used with identical connections
to create the other half.
The CH 1 Mid-Hi and CH 3 outputs drive the upper and
lower MSL-6 arrays, respectively. Since the coverage
areas of the upper and lower MSL-6 arrays intersect to
some degree, CH 3 is delayed to phase align the upper
and lower systems. The Lo Cut switches for the CH 1
Mid-Hi and CH 3 outputs should be in. The number of
MSL-6s for each row depends on the horizontal coverage
required by the system; each tight-packed unit adds
30
°
. Refer to the MSL-4 and 650-P Operating Instructions
to design arrays for those speakers.
