User manual VELODYNE DF-661

[. . . ] ft. (sealed) * Recommended enclosures : This product has been designed to perform in any type of enclosure, or in an infinite baffle setup. Performance of the subwoofer system may be tailored to your listening taste by altering the type of enclosure used. Consult installation manual for further details. Power requirements are typically reduced when used in an infinite baffle configuration. Specifications are subject to change without notice. Double check all connections to unit before applying power. [. . . ] For the lowest distortion speakers around, there is only one choice. Velodyne, the bottom line in bass. Warranty & Service Information This product is constructed of the highest grade materials and assembled under the strictest possible quality assurance conditions. Should a situation arise which leads you to believe the product is malfunctioning, please return to your authorized Velodyne dealer first. Should the product require repair or service, your Velodyne dealer is required to send the product in to Velodyne directly, we do not authorize outside service stations to make repairs to this product. If you have any additional questions concerning the specific warranty coverage, please consult the supplied warranty & registration card. Any additional questions which are not covered in this manual should be directed to either your authorized Velodyne dealer or contact us directly at Velodyne . . Care Of Your Velodyne This product combines both electronic devices and loudspeakers. Care must be taken not to damage either unit. Please take every precaution possible when installing and using the product so damage does not occur. q Do not allow objects to come in contact with the clear anodized aluminum cone, as the cone is very delicate. q Use only damp cloth when cleaning either controller housing or speaker. This unit monitors the music signal, which should be reproduced exactly without distortion. We then mount two accelerometers on the speaker. One accelerometer monitors cone motion, while the other accounts for motion of the vehicle. Now that we can monitor the actual motion of the cone, we can instantaneously compare how well the acoustic output of the speaker matches the music signal. If & when the output from the speaker starts to deviate from the music signal, the servo circuitry modifies the drive signal Practice Safe Sound WE WANT YOU LISTENING FOR A LIFETIME!Used wisely your new sound reproduction equipment will provide you with a lifetime of listening pleasure. Unfortunately, hearing damage from exposure to loud noise is often undetectable until it is too late. Since it is all too easy to keep "turning up the volume" so you can overcome road noise, we would like to issue this word of caution. Velodyne recommends that you avoid prolonged exposure to excessive sound pressure levels. The following list is included for your protection. Decibel Level Example 40 dB Quiet library, soft whispers 50 dB Typical quiet room 60 dB Office equipment, background noise 70 dB Vacuum, hair dryer, restaurant 80 dB Average city traffic Sustained exposure to levels of noise higher than this can be dangerous to your hearing. 90 dB Subway, motorcycle, lawn mower 100 dB Garbage truck, power tools 120 dB Live rock concert 140 dB Gunshot (close range), jet plane 180 dB Rocket launching pad Information courtesy of Deafness Research Foundation. 3 8 The Velodyne Story . [. . . ] Anything imperfect originates elsewhere. By design, Velodyne speakers are incapable of error. to the amplifier. Forcing the speaker's acoustical output into a true representation of the music. The term "servo" is misused by some manufacturers who use a different motor on their speakers to try and make woofers sound like larger more powerful units. [. . . ]