Description
The Velodyne HGS-18 THX Ultra 2 is a legendary, high-end 18-inch powered subwoofer known for its high-output, low-distortion performance driven by a patented high-gain servo-control system.
The detailed technical specifications sourced from official Velodyne Acoustics manuals and verified documentation are detailed below:
Audio Performance & Output
Frequency Response: 15Hz – 120Hz ($\pm$3 dB)
Total Harmonic Distortion: Less than 0.5% (managed by an accelerometer-based servo system)
Maximum Output: Capable of reaching over 120 dB in corner placement
Amplifier Specs
Amplifier Type: Class D (Ultra-Efficient Digital Switching)
Power Output: 1,250 Watts RMS / 3,000 Watts Peak
Driver & Motor Structure
Woofer Size: 18" forward-firing cone (15.2" piston diameter)
Voice Coil: Tandem 3-inch push-pull voice coils
Magnet Weight: 220 oz. (13.7 lbs.)
Total Motor Structure: 380 oz. (24 lbs.)
Crossovers & Filters
Low Pass Crossover: Variable from 40Hz to 120Hz (12 dB/octave initial, 48 dB/octave ultimate slope)
High Pass Crossover: Selectable 80Hz or 100Hz (6 dB/octave)
Subsonic Filter: Selectable 15Hz or 35Hz
Phase Control: 0° or 180° switchable
Connectivity & Features
Inputs: Line-level (RCA unbalanced), Balanced (XLR), and Speaker-level binding posts
Outputs: Line-level (RCA) and Speaker-level
Enclosure Design: Sealed housing, magnetically shielded for video proximity
Convenience: Signal-sensing auto turn-on/off circuit
Cabinet & Weight
Dimensions (H x W x D): 23.5" x 21.25" x 18.5" (approx. 597mm x 540mm x 470mm)
Weight: ~115 lbs. (52 kg)
Unit is 110V…