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General| Type | Powered subwoofer |
|---|---|
| Driver Size | 15 inches |
| Enclosure Type | Sealed |
| Inputs | Line-level, Speaker-level |
| Weight | 85 lbs |
| Phase Control | 0, 180 degrees |
Covers initial welcome, essential safety warnings, and lists system components.
Details physical connections, speaker cable polarity, and controller ventilation.
Guides on cabinet placement, magnetic field precautions, and setting subwoofer level.
Explains crossover presets, modification, and the optional bypass accessory.
Details interconnection for stereo pairs and matched set identification.
Describes dual subwoofers in mono mode and connection to a mono subwoofer output.
Provides guidance on cleaning, maintenance, and explains the protection circuitry.
Addresses unit not playing, shutdowns, sound issues, and normal operational pops.
Introduces the High Gain Servo (HGS) system and its philosophy of ultra-low distortion.
Explains nonlinear distortion, the problem, and Velodyne's motional feedback solution.
Details the function of key HGS components like crossovers, amplifier, driver, and accelerometer.
Provides comprehensive technical specifications for the ULD-18 and ULD-15 Series II models.
Outlines crucial safety warnings regarding electrical shock, water, ventilation, and servicing.
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