Advertisement
Figure 3—Impedance Curve
Figure 4—Dimension Line Drawing
Specifications
Typical Axial Frequency Response, Swept
Sine Wave, 4 volts at 3.05 meters (10 feet),
(anechoic environment, normalized
for 1 watt at 1 meter; see Figure 1):
60-3,300 Hz
Low-Frequency 3-dB-Down Point:
60 Hz
Usable Low-Frequency Limit (10-dB-
down point):
45 Hz
Half-Space Reference Efficiency:
2.9%
Long-Term Average Power-Handling
Capacity per ANIS/EIA RS-426-A 1980
(see Power-Handling Capacity section):
300 watts
Maximum Woofer Acoustic Output:
9 watts
SPEAKERS—Low Frequency Systems
Sensitivity (SPL at 1 watt, 1 meter
input, anechoic environment, swept
sine wave, 50 to 200 Hz):
98 dB
Dispersion Angle Included by 6-dB-
Down Points on Polar Responses:
Essentially omnidirectional
Distortion, 0.1 Full Power Input at
100 Hz (see Figure 2),
Second Harmonic:
–30 dB, 3%
Third Harmonic:
–49 dB, 0.4%
Transducer Complement,
SG18 18-inch woofer
Box Tuning Frequency:
48 Hz
Recommended Crossover Frequency:
200 Hz or below
Recommended Crossover Slope:
12 dB per octave, minimum
a MARK IV company
600 Cecil Street, Buchanan, MI 49107
800/234-6831, 616/695-6831, 616/695-1304 Fax
Impedance,
Nominal:
8.0 ohms
Minimum:
6.2 ohms
Input Connections:
Two parallel 1/4-inch phone jacks
(Two parallel Neutrik Speakon
NL4MP connectors on S18-E)
Enclosure Materials and Colors:
Black-carpeted Road Wood
Black perforated metal grille
Enclosure Dimensions (see Figure 4),
Height:
778 mm (30.7 in.)
Width:
505 mm (19.9 in.)
Depth:
464 mm (18.3 in.)
Net Weight:
27.7 kg (61 lb)
Shipping Weight:
31.8 kg (70 lb)
Part Number 533657 – 9639
®
TM
Advertisement
