Speaker Type     48" coaxial, in-ceiling, ported (20 W transformer for 25, 70.7, 100 VDC or transformer bypass)
Impedance     4 Ω nominal
Sensitivity     90 dB @ 2.83 V/1 m
87 dB @ 1 W/1 m (1 W 1 m sensitivity determined using nominal impedance)
Frequency Response     90 Hz - 22 kHz @ -3 dB
75 Hz - 22 kHz @ -10 dB (Frequency response measured in half or full space as dictated by speaker mounting configuration)
Max. Program Power     40 W (Max program power is 3 dB above max continuous power)
Max. Continuous Power RMS     20 W (Continuous power rating, EIA-426-B test)
Max. power SPL     100 dB @ 1 m (Max output based on max continuous power)
Coverage Angle     100º (-6 dB @ 2 kHz)
65º (-6 dB @ 10 kHz)
95º (averaged 2-10 kHz)
Directivity Factor     4.6 (averaged 100 Hz - 10 kHz)
4.3 (2 kHz)
Directivity Index     5.6 dB (averaged 100 Hz - 10 kHz)
6.3 dB (2 kHz)
Tap Selector     5-position rotary switch with transformer bypass position
Transducer     Low-Frequency Driver: 4" (102 mm) Polypropylene cone, butyl rubber surround
High-Frequency Driver: 1" (25 mm) Silk dome tweeter
Voice Coil     Low-Frequency: 0.75" (19 mm)
Crossover Frequency     1.8 kHz
Network Type     Low and High Pass 12 dB per octave, 2nd order
Certifications     UL 1480 and 2043 Approved
CE Approved
RoHS     Approved
Input Connector     1 x 4-pin, Euroblock terminal
Color     Black
Mounting Holes Diameter     6.6" (167.6 mm)
Ceiling Thickness     0.025 to 1.87" (0.6 to 47.5 mm) minimum to maximum
Dimensions (Ø x D)     6.05 x 6.55" (153.7 x 166.4 mm)
Weight     5.5 lb (2.5 kg)