Acoustic Performance:
Frequency Response (-10 dB)
40 Hz-20 kHz
Frequency Response (-3 dB)
50 Hz-18 kHz
Horizontal Coverage (-6 dB)
80 degrees averaged
2 kHz to 10 kHz
Vertical Coverage (-6 dB)
50 degrees averaged
2 kHz to 10 kHz
Directivity Index (dB)
11.4 averaged
2 kHz to 10 kHz
Directivity Factor (Q)
14.0 averaged
2 kHz to 10 kHz
Max peak SPL (calculated)
1
135 dB
Max peak SPL (measured)
2
125 dB
Crossover Point
1200 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
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
High Frequency Power Amplifier
Rated Power
100 watts rms
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
Cabinet
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
HD151 Specifications
Appendix C: Technical Information
1
HD151
HD15
21