Chapter 4: Adding Subwoofers To A Jm-1P Loudspeaker System; The Galileo Loudspeaker Management System - Meyer Sound JM-1P Operating Instructions Manual

CHAPTER 4: ADDING SUBWOOFERS TO A JM-1P LOUDSPEAKER SYSTEM

700-HP subwoofers can be added to JM-1P loudspeaker
systems to enhance the low-frequency response and
increase the overall acoustic power of the system in the low-
est frequencies. The ideal ratio of JM-1P loudspeakers to
700-HP subwoofers depends on the frequency content of
the source material and headroom required for low frequen-
cies.
Table 2: Recommended Ratio of JM-1Ps to Subwoofers
Sub- Frequency
woofer Response
700-HP 30 Hz – 125 Hz
±4 dB
700-HPs can be added to JM-1P systems by daisy-chaining
them to JM-1P loudspeakers. Full-range signals can be
connected directly to Meyer Sound self-powered loud-
speakers because the loudspeakers have built-in active
crossovers. In more complex systems, subwoofers should
be integrated using line drivers or digital signal processor to
send multiple outputs to each sub-system. In addition, you
can use low-cut filters to flatten the overall frequency
response of the system while increasing the JM-1P head-
room in the lower frequencies.
NOTE: When JM-1P loudspeakers and
700-HP subwoofers are daisy-chained using
the JM-1P's Loop connector, the result is a fairly flat
frequency response. However, the response will show
an increase in the 60 Hz – 200 Hz range where the
loudspeaker and subwoofer overlap at certain ratios
(see Table 2).
NOTE: If the 700-HP exhibits limiting (its Limit
LED lights) before reaching the required SPL,
consider adding more subwoofers to meet the SPL
requirements without exposing the drivers to exces-
sive heat and excursion.
TIP: MAPP Online Pro™ can be used to accu-
rately predict the appropriate loudspeaker and
subwoofer integration in systems, complete with cov-
erage data, system delay and equalization settings,
rigging information, and detailed design illustrations.
For more information, see "MAPP Online Pro" on
page 31.
Recommended Ratio
(Number of JM-1Ps per Subwoofer)
2 x 1 for normal applications
3 x 2 for bass-heavy applications
requiring additional low-frequency
headroom
THE GALILEO LOUDSPEAKER MANAGEMENT
SYSTEM
Meyer Sound's Galileo ® loudspeaker management system is
a comprehensive solution for driving and aligning loud-
speaker systems, especially those comprised of Meyer
Sound self-powered loudspeakers. The system is available
in two hardware configurations:
The Galileo 616 is a two-space rack unit with six inputs
and 16 low-latency outputs. Processing for the outputs
includes gain, polarity, delay, high- and low-pass filters,
equalization (parametric and TruShaping), and atmo-
spheric correction.
Galileo 616
The Galileo 408 shares the same 24-bit, 96 kHz audio
quality and 32-bit floating point internal processing as
the Galileo 616, though with fewer inputs and outputs.
1 2 3
SIGNAL / CLIP
MUTE
INPUT
Galileo 408
All system parameters for the Galileo 616 and Galileo 408
can be configured from the extensive Compass™ software
running on a Windows or Mac
can also be configured from its intuitive front panel controls.
The Galileo system interfaces seamlessly with Meyer
Sound's SIM ® 3 audio analyzer.
TIP: The Galileo 616 and Galileo 408 include
presets optimized for JM-1P loudspeaker sys-
tems.
4 5 6 7 8
OUTPUT
® computer. The Galileo 616
17