Meyer Sound M3D !

•

M3D

™

Line Array Meyer Sound Laboratories Inc

CABLING

One method of cabling the system is using the Meyer

Sound/VEAM cable system. This system incorporates

power, signal, and RMS monitoring system all in one

heavy-duty cable and connector per M3D cabinet.

The electrical, signal, and RMS cables for each cabinet

can be consolidated to create a “three-pair” multi-

conductor cable. This can be accomplished by using

separate electrical and signal XLR cable. The electrical,

signal, and RMS cable for each box can be loomed

together per box to create a “three-pair” multi-

conductor cable for each cabinet. This ensures no

patching errors and a minimum of cables behind the

array.

Two ring/stud fittings are provided on the back panel of

each M3D and M3D-Sub for the purpose of strain

relieving all cabling. Insert the signal, data, and AC

connections into each loudspeaker as the array is being

rigged, swag all cables under the rain hood’s side flaps,

and tie them off onto either the left or right rings of the

ring/stud fitting as shown in Figure 23. Using the strain

reliefs will minimize the chance of cables being damaged

during installation of the sound system.

USING THE M3D-SUB WITH THE M3D

LINE ARRAY LOUDSPEAKER

The M3D system will provide full bandwidth frequency

response without M3D-Sub directional subwoofers. The

height of the array (number of cabinets) and the desired

SPL will determine how much sub-bass energy can be

provided, proportional to the upper-frequency spectrum.

If higher SPL is necessary or the program content

requires additional sub-bass energy, then M3D-Sub

direction subwoofers can be used to augment the M3D

line arrays.

There is no polarity switch on either the M3D Line Array

or the M3D-Sub directional subwoofer. Both are wired

pin 2 “hot” (positive acoustic pressure when a positive

pulse is applied to pin 2).

The M3D Line Array frequency response operates down

to 35 Hz, while the M3D-Sub operates in the range of

30 Hz to 80 Hz. The M3D-Sub therefore does not extend

the system response appreciably; rather, it increases the

acoustic power of the system in the lowest frequencies.

This can be very useful in applications that require large

amounts of low-frequency energy, such as the

reinforcement of popular music.

Both the M3D Line Array and the M3D-Sub have a

cardioid directional pattern and are designed to provide

maximum cancellation from six to twelve meters behind

the cabinet (-20 dB at 8 meters). When they are used

together, in addition to increased forward power, the

rear power cancellation also improves.

Driving the M3D-Sub

All Meyer Sound products have been optimized with

internal crossover networks. When most Meyer Sound

loudspeakers are used together, these networks provide

maximum power addition through their respective

overlapping frequency ranges when used in close

proximity and co-planar to one another.

You may loop connections between the M3D Line Array

and the M3D-Sub. This will result in 6 dB greater sound

pressure in the 40 Hz to 100 Hz range, as shown in

Figure 24, a ground-plane measurement taken at six

meters.

Figure 23. Tying off cables to rings.

!CAUTION: The rear ring/stud fittings shown

in Figure 23 must be used only to secure

system cabling. These fittings are not intended

to be used for system rigging or a pull-back

motor (pulling the bottom of the array

backward to increase downward tilt). The

points are mounted on each side of the

amplifier area, so as not to interfere with the

rain hood and the amplifier fan exhaust area.