HD1521
Appendix C: Technical Information
HD1521 Specifications
Acoustic Performance: |
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| Power Amplifiers |
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Frequency Response | 40 |
| Low Frequency Power Amplifier |
|
Frequency Response | 50 |
| Rated Power | 700 watts rms |
Horizontal Coverage | 80 degrees averaged |
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| 1400 watts peak |
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| 2 kHz to 10 kHz |
| Rated THD | < 0.03% |
Vertical Coverage | 50 degrees averaged |
| Design | Class D |
| 2 kHz to 10 kHz |
| High Frequency Power Amplifier |
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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) | 135 dB |
Max peak SPL (measured) | 125 dB |
Crossover Point | 1200 Hz |
Equalization
Contour EQ
Low Shelving | |
| 80 Hz, 6 dB / octave |
| 100 Hz to 8 kHz, Q=1.5 |
High Shelving | |
| 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 | |
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 |
Calculated from driver sensitivity and amplifier power.
Measured with pink noise, free field at 1 meter, before limiting.
Rated Power |
| 100 watts rms |
|
| 200 watts peak |
Rated THD |
| < 0.03% |
Design |
| Class D |
Input/Output |
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Input Type |
| Female XLR balanced |
Input Impedance |
| 11 kohm balanced |
Loop Out |
| Male XLR balanced |
Line Input Power |
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US model |
| 120 VAC, 60 Hz |
Recommended Service | 9 amps | |
European model |
| 230 VAC, 50 Hz |
Recommended Service | 5 amps | |
AC Connector |
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Safety Features |
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Input Protection: | RMS limiting, power supply and | |
| amplifier thermal protection | |
Display LEDs: | Power ON, EQ ON, Sig/Limit, | |
| Thermal protection, Front Power | |
| ON |
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Construction Features |
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Basic Design | Trapezoidal, 20 degree included | |
| angle |
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Cabinet | 15 mm exterior grade premium | |
| birch plywood | |
Finish | High durability black paint | |
Handles | One on each side | |
Grille | ||
Fly Points | Twelve M10 x 1.5 mm | |
12 | HD1521 |