Velodyne servo-control solution, Inputs | Velodyne Acoustics HGS 12

systems, particularly home theater systems. Even at 1 watt, many conventional units produce several percent distortion. Secondly, the odd order, higher harmonics are much more offensive to the human ear than the closer 2nd harmonic.

An interesting result of this reduced distortion is that some of the bass, when played over an extremely accurate subwoofer system, seems to actually be missing. The truth, however, is that the "missing" bass was never there to begin with! Distortion products of conventional woofers actually add to the bass spectrum making it appear louder than recorded. This is due to the additional and unwanted harmonics (distortion) of the fundamental signal. While conventional subwoofers offer little to combat distortion products, we at Velodyne have developed another way. . .

The Velodyne servo-control solution

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The Velodyne HGS subwoofers produce sound in the same manner as conventional loudspeakers: a cone-shaped piston is forced to move by means of a linear motor. However, this is about the only conventional part of the subwoofer.

We determined that conventional motors are unacceptable when called upon to produce the amount of linear motion we desired. This inadequacy led us to design an improved motor structure by incorporating two coils, operating out of phase in a push-pull configuration within two magnetic gaps & suspended by dual spiders for even greater linearity. We designed this motor to produce over one inch (1-1/4" to be exact) of linear motion, with a maximum mechanical limit of 2" peak to peak. Also, with this unique configuration, the distortion products are reduced by a factor of two over conventional single coil structures with dramatically improved cone control. This driver alone would result in less distortion than any other non servo design. After optimizing every remaining part of the loudspeaker, we then turned to the electronics.

As in our other servo products, we then incorporated closed-loop accelerometer based servo-control of the loudspeaker. At the heart of this control system is a low mass accelerometer rigidly attached to the voice coil. The accelerometer continuously monitors cone motions, providing a feedback signal for the servo control circuitry. This high-gain system is designed to improve linearity and reduce distortion approximately 30 times over

Product Features & Controls

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•10" or 12" subwoofer with tandem 3" voice coils & 310 oz. motor

•Built-in 1000/1250 watt (RMS) high efficiency class D amplifier

•Accelerometer based servo control system for extreme accuracy

•Adjustable (40 to 120Hz) low-pass crossover (defeatable)

•Multiple staggered low-pass crossovers; 12dB/octave initial, 48dB/octave ultimate

•Line-level (RCA) inputs & outputs

•80 Hz high-pass crossover output

•Signal sensing auto turn on/off (defeatable)

•Variable volume control

•Selectable phase control (0˚ or 180˚)

•Selectable subsonic filter (20Hz or 35Hz)

•Frequency response of 20Hz - 120Hz +/- 3dB

•Detachable power cord

•Anti-clipping circuit prevents over excursion & amp clipping

•Optional remote control with power, volume and mute functions

Installation

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Your new Velodyne servo subwoofer provides for a number of installation options. Read all the installation information below in order to determine which installation option is best for your system. Remember to perform all installation procedures with subwoofer unplugged!!!

Inputs

Your new subwoofer is equipped with line-level inputs. Use the LINE LEVEL jacks when connecting your subwoofer to a pre-amp, signal processor, line-level crossover, or receiver with pre-amp level outputs. If your receiver/electronics does not have RCA type line level outputs, you must use a high to low level adapter. Consult the dealer where you purchased the unit for further details.

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HGS 12, HGS 10 specifications

Velodyne Acoustics is a company renowned for its innovation in the audio technology field, particularly in subwoofer design. Two of its standout products are the HGS-10 and HGS-12 subwoofers. These models embody Velodyne’s commitment to delivering powerful, high-fidelity sound by combining advanced technologies with user-friendly features.

The HGS-10 and HGS-12 subwoofers are designed to provide deep bass extension and superior control, making them ideal for both home theater and music listening environments. One of their main features is their use of Velodyne’s patented Digital Drive Technology. This technology utilizes advanced digital signal processing to monitor and control the movement of the subwoofer driver in real-time, ensuring that the sound quality remains consistent and distortion-free, even at high volume levels.

Both models house large, powerful drivers that are engineered for maximum efficiency. The HGS-10 includes a 10-inch driver, while the HGS-12 features a larger 12-inch driver, allowing for deeper bass response. The cabinet design of these subwoofers is also notable; they are constructed with a sturdy, well-braced enclosure that minimizes unwanted vibrations, enhancing sound clarity.

The subwoofers are equipped with a variety of connectivity options, including line-level inputs and outputs, enabling easy integration into existing audio systems. They also feature adjustable crossover controls, allowing users to tailor the frequency response to match their listening environment. This flexibility makes it possible to achieve optimal performance regardless of the room’s acoustics.

Another significant characteristic of the HGS series is the inclusion of the room control feature. This allows users to optimize bass response based on their specific room characteristics, enhancing overall audio performance. Additionally, both models come with a remote control, enabling users to make adjustments from the comfort of their seating area.

In summary, Velodyne Acoustics HGS-10 and HGS-12 subwoofers stand out for their combination of advanced technologies, powerful drivers, and user-centric features. With their ability to deliver exceptional bass performance while minimizing distortion, they cater to audiophiles and home theater enthusiasts alike, solidifying Velodyne’s presence in the high-performance audio market. These subwoofers are more than just typical audio equipment; they are a testament to the pursuit of audio excellence.