Meyer Sound 600-HP - Manual (Page 22)

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CHAPTER 5
Figure 5.1. Array with 600-HP and MICA
600-HP Used with Concert and UltraSeries
Loudspeakers
All Meyer Sound self-powered products have been opti-
mized with internal crossover networks. When Meyer Sound
loudspeakers are used in close proximity and are coplanar,
these networks provide maximum power addition through
their respective overlapping frequency ranges.
Several basic connection options are available when using
the 600-HP subwoofer with other Meyer Sound Concert
or UltraSeries loudspeakers, as discussed in the following
sections.
Daisy-Chained
If 600-HP subwoofers and other Meyer Sound loudspeakers
are daisy-chained using the loop feature on the user panel,
the result is a smooth frequency response through the
“overlap range.” When the 600-HP and other Meyer Sound
loudspeakers are coplanar, this usually occurs at a ratio of
two loudspeakers to each 600-HP. This is the configuration
commonly used in small systems.
NOTE: Full-range signals may be applied to
Meyer Sound’s self-powered loudspeakers
and subwoofers because they have built-in active
crossovers.
The 600-HP subwoofers should be placed as close as pos-
sible to the other loudspeakers so that the relative distanc-
es between them are the same at all listening positions.
NOTE: When 600-HP subwoofers are used
with Concert Series or UltraSeries loud-
speakers in their full-range configuration (e.g.,
looped audio or the same audio feed), their polari-
ties should be the same if they are coplanar or near
each other. The 600-HP does not have a polarity
reversal switch, so make sure that all systems are
set to Pin 2 +. If they are separated by a greater
distance — or delay must be used between them
— a measurement system such as the SIM audio
analyzer should be used to determine the correct
delay and polarity.
CAUTION: When daisy-chaining, make sure
that the source equipment can drive the total
load of the paralleled array. (See Chapter 3: Amplifi-
cation and Audio.)
Adding an LD-1A/LD-2 Line Driver
Driving 600-HP subwoofers and Meyer Sound loudspeakers
with the same signal from different outputs using a line
driver allows adjustments to the gain of each sub-system,
and could be used effectively to compensate for the ratio
of loudspeakers or acoustical conditions. If the gains are
adjusted to the same level, the combined response is
identical to a daisy-chained configuration.
Using the LD-1A/LD-2’s Lo-Cut Filter
Using the Lo-Cut filter of the LD-1A or LD-2 (Figures 5.1
and 5.2, respectively) optimizes the full-range loudspeaker
headroom and reduces the area of overlap; the full-range
loudspeakers in the system receive their signal following
a Lo-Cut (high-pass) filter, while the 600-HP subwoofers
apply their normal internal crossover frequencies to a
full-range signal. This configuration results in a smooth
frequency response through crossover and reduces the
overlap frequency range between the speakers. However,
the use of external filters — like the Lo-Cut in the LD-1A
and LD-2 — is optional, and should be used very carefully
to minimize phase shifts that can cause cancellations in the
overlap area.