Electro-Voice DH1506 is a professional sound reinforcement loudspeaker with a 5-year warranty. It features a diaphragm assembly that can be easily replaced by following the instructions provided in the service data. The DH1506 has a voice coil DC resistance of 4.31 to 5.49 ohms and can be tested directly with an ohm meter to check voice coil and solder connections. Its acoustic quality can be checked by applying 4 volts RMS to the voice coil and frequency sweep from 100 Hz to 3 kHz without horn load, listening for any obvious rubs or buzzes.