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APPENDIX C: SPECIFICATIONS
NOTE:
Loudspeaker system predictions for coverage and SPL are available in Meyer Sound's MAPP predic-
tion software.
1100-LFC Specifications
ACOUSTICAL
Operating Frequency Range
Frequency Response
Phase Response
Linear Peak SPL
COVERAGE
TRANSDUCERS
Low Frequency
AUDIO INPUT
Type
Maximum Common Mode Range ±15 V DC, clamped to earth for voltage transient protection
Connectors
Input Impedance
Wiring
Nominal Input Sensitivity
Input Level
28 Hz – 100 Hz
Note: Recommended maximum operating frequency range. Response depends on load-
ing conditions and room acoustics.
30 Hz – 85 Hz ±4 dB
Note: Measured in half-space with pink noise at 4 m, 1/3-octave frequency resolution.
34 Hz to 82 Hz ±30 degrees
140 dB with crest factor >9.5 dB (M-noise), 140 dB (Pink Noise), 141 dB (B-noise)
Note: Linear Peak SPL is measured in half-space at 4 m referred to 1 m. Loudspeaker
SPL compression measured with M-noise at the onset of limiting, 2-hour duration, and
50-degree C ambient temperature is <2 dB.
M-noise is a full bandwidth (10 Hz–22.5 kHz) test signal developed by Meyer Sound to
better measure the loudspeaker's music performance. It has a constant instantaneous
peak level in octave bands, a crest factor that increases with frequency, and a full band-
width Peak to RMS ratio of 18 dB. The presence of a greater-than (>) symbol with regard
to crest factor indicates it may be higher depending on EQ and boundary loading.
Pink noise is a full bandwidth test signal with Peak to RMS ratio of 12.5 dB.
B-noise is a Meyer Sound test signal used to ensure measurements reflect system
behavior when reproducing the most common input spectrum, and to verify there is still
headroom over pink noise.
360° (single unit); Varies with number of units and configuration.
Two 18 in long-excursion cone drivers; 8 Ω nominal impedance
Differential, electronically balanced
XLR 5-pin female with male loop output; XLR 3-pin female connectors available to
accommodate only balanced audio (no RMS signals)
10 kΩ differential between pins 2 and 3
Pin 1: Chassis/earth through 220 kΩ, 1000 pF, 15 V clamped network to provide virtual
ground lift at audio frequencies
Pin 2: Signal (+)
Pin 3: Signal (–)
Pin 4: RMS (polarity insensitive)
Pin 5: RMS (polarity insensitive)
Case: Earth ground and chassis
Note: Pins 4 and 5 (RMS) included only with XLR 5-pin connector that accommodates
both balanced audio and RMS signals.
0.0 dBV (1.0 V rms) continuous is typically the onset of limiting for noise and music
Audio source must be capable of producing +20 dBV (10 V rms) into 600 Ω to produce
the maximum peak SPL over the operating bandwidth of the loudspeaker
1100-LFC OPERATING INSTRUCTIONS
35
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