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Acoustic Performance:
Frequency Response (-10 dB) 38 Hz-20 kHz
Frequency Response (-3 dB) 50 Hz-18 kHz
Horizontal Coverage (-6 dB) 90 degrees averaged
2 kHz to 10 kHz
Vertical Coverage (-6 dB) 40 degrees averaged
2 kHz to 10 kHz
Directivity Index (dB) 10.7 averaged
2 kHz to 10 kHz
Directivity Factor (Q) 11.9 averaged
2 kHz to 10 kHz
Max peak SPL (calculated)
1
135 dB
Max peak SPL (measured)
2
126 dB
Crossover Points 400 Hz, 1500 Hz
Equalization
Contour EQ
Low Shelving -3 dB to +3 dB
80 Hz, 6 dB / octave
Mid-Peaking -3 dB to +3 dB
100 Hz to 8 kHz, Q=1.5
High Shelving -3 dB to +3 dB
12 kHz, 6 dB / octave
High-Frequency Section
Voice Coil Diameter 1.75” / 44.5 mm
Horn Entry Diameter 1.0” / 25 mm
Diaphragm Material Heat-treated titanium
Magnet Material Ferrite
Mid-Frequency Section
Diameter 6.0” / 152.4 mm
Diaphragm Material Paper
Magnet Material Ferrite
Low-Frequency Section
Woofer Diameter 15.0” / 381 mm
Voice Coil Diameter 3.0” / 76.2 mm
Diaphragm Material Paper
Magnet Material Neodymium
1 Calculated from driver sensitivity and amplifier power.
2 Measured with pink noise, free field at 1 meter, before limiting.
Power Amplifiers
Low Frequency Power Amplifier
Rated Power 700 watts rms
1400 watts peak
Rated THD < 0.03%
Design Class D
Mid Frequency Power Amplifier
Rated Power 100 watts rms each
200 watts peak
Rated THD < 0.03%
Design Class D
High Frequency Power Amplifier
Rated Power 100 watts rms each
200 watts peak
Rated THD < 0.03%
Design Class D
Input/Output
Input Type Female XLR balanced
Input Impedance 11 kohm balanced
Loop Out Male XLR balanced
Line Input Power
US model 120 VAC, 60 Hz
Recommended Service 9 amps
European model 230 VAC, 50 Hz
Recommended Service 5 amps
AC Connector 3-pin IEC 250 VAC
Safety Features
Input Protection: RMS limiting, power supply and
amplifier thermal protection
Display LEDs: Power ON, EQ ON, Sig / Limit,
Thermal protection, Front Power
ON
Construction Features
Basic Design Trapezoidal, 20 degree included
angle
Material 15 mm exterior grade premium
birch plywood
Finish High durability black paint
Handles One on each side
Grille Powder-coated galvanized steel
Fly Points Twelve M10 x 1.5 mm
HD1531 Specications
Appendix C: Technical Information
1
HD1531
HD1531