• Maximum Output Power : 500 W
• Audio Input : 2 x 3-pin servo balanced XLR
• Sensitivity : +4 dBu at 0 dB (center position) for full rated power
• Input Impedance : 12 kΩ unbalanced; 24 kΩ balanced
• Audio Output Thru A/B : servo-balanced XLR
• Audio  Output A/B : servo-balanced XLR
• Impedance : 300 Ω unbalanced; 600 Ω balanced
• High-Pass Filter : 100 Hz, butterworth with 18 dB slope
• Controls Level : -∞ to +6 dB
• Controls Boost (Switchable) : 40 to 90 Hz, +10 dB
• Controls Cut (Switchable) : 70 to 150 Hz, Butterworth, 24 dB slope
• System Frequency Range : 45 to 200 Hz (-10 dB)
• Frequency Response : 60 to 150 Hz (± 3 dB)
• Signal-to-Noise Ratio : >100 dB
• SPL : Maximum 124 dB at 1 m
• Woofer : 18" (456 mm) at 8 Ω
• Limiter : Optical
• Indicator Signal : Green
• Indicator Limiter : Red
• Indicator Power : Amber
• Protection Amplifier : Full short circuit, open circuit, thermal protection
• Protection  Load : Turn-on/off muting
• Weight : 84.1 lb (38.2 kg)

Powerful, high-efficiency Class-D amplifiers and Switch Mode Power Supply technology coupled with state-of-the-art DSP functionality sure sounds impressive but what about the part of the system you actually hear. Our LF transducers are designed specifically for each application, it's what sets us apart from the competition. When you buy a BEHRINGER active subwoofer, you can rest assured that the transducer inside has been engineered to perform flawlessly with every other element for truly professional results. The VQ1800D active subwoofer is capable of extremely high sound pressure levels: 124 dB (Full Space, 1 W @ 1 m), with a frequency range of 40 - 200 Hz. The VQ1800D features balanced XLR inputs and outputs, as well as balanced XLR Thru jacks for connecting additional enclosures. A Boost Frequency knob targets a boost frequency between 40 and 90 Hz. Flick the Boost switch to give your selected frequency a +10 dB boost. The VQ1800D also has a High Cut dial that provides precision control over the upper-corner frequency of the subwoofers amplifier. The High Cut dial does not affect the Thru signals, only signals directed to the subwoofer. The signals at the Output sockets are processed through a 100 Hz high-pass filter, providing optimized feeds for your full-range satellite speakers. A Level knob controls the input gain, and the Phase switch reverses the output phase to compensate for frequency cancellation between the subwoofer and satellite speakers. LEDs show operational status at a glance, including power, signal present and input overloads.

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