Meyer Sound M3D Figure 24. , Figure 25. , NOTE:

Meyer Sound Laboratories Inc M3D

™

Line Array

•

When the two are driven with the same signal but the

M3D-Sub is attenuated by 6 dB, the response is identical

to the M3D Line Array alone but extends to 30 Hz, as

shown in Figure 25.

The third option provides optimal headroom to the M3Ds,

while adding an often preferred frequency response

bump centered around 65 Hz. This configuration, shown

in Figure 26 and Figure 27, high passes the M3D

loudspeakers in the array while letting the M3D Subs use

their normal internal crossover frequencies. If the 65 Hz

bump in the spectrum isn’t desired, an equalization filter

can be used to flatten the overall response, while still

optimizing system headroom.

To achieve this, drive the M3D loudspeakers using the

DS-2 (or mid bass) output of the LD-1A line driver, as

shown in Figure 26 or the LD-2 line driver as shown in

Figure 27, with the DS-2 crossover engaged and with no

polarity reversal. This provides a crossover function by

rolling off the M3D Loudspeakers below 80 Hz, as shown

in Figure 28. increasing its headroom at very low

frequencies.

The DS-2 & Sub Crossover network is composed of a

low-pass and an elliptical filter. Pushing the switch in

activates the two-way crossover, sending frequencies

below 80 Hz to the Sub output and above 80 Hz to the

DS-2 output. With the switch out, a full-range signal is

sent to both the DS-2 and Sub outputs. Since this filter

affects the DS-2 out and the SUB out the M3D-Subs need

to be connected to the Mid-Hi output receiving a full

range signal.

Figure 24. M3D Line Array and M3D-Sub with looped connections

Figure 25. M3D Line Array and M3D-Sub with M3D-Sub attenuated by 6 dB

NOTE: Full-range signals may be applied to

Meyer self powered subwoofers because they

have built-in active crossovers that filter mid-

hi frequencies; external crossovers are

unnecessary.