User manual VELODYNE DD 1812 SE DATASHEET

[. . . ] Refer servicing to qualified service personnel. THE LIGHTNING FLASH WITH ARROWHEAD SYMBOL is intended to alert the user to the presence of uninsulated "dangerous voltage" within the product's enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons. THE EXCLAMATION POINT SYMBOL is intended to alert the user to the presence of important operating and maintenance (servicing) instructions in the literature accompanying the subwoofer. 1. READ INSTRUCTIONS -- All safety and operating instructions should be read before the product is operated. [. . . ] To help you understand the parameters you can optimize, this section then discusses each how each parameter affects the subwoofer's bass output. Finally, this part recommends the basic methodology for performing Manual-EQ optimization. OPTIMIZATION METHODS The Digital DrivePLUS subwoofer offers the Place & Play, Self-EQ, Auto-EQPLUS and Manual-EQ optimization methods. EQ is a shorthand way to refer to all the subwoofer's parameters that can be changed to equalize how the subwoofer sounds throughout its frequency range. You choose what is right for you although Velodyne recommends Auto-EQPLUS as it automatically gives you great sounding bass in about 5 minutes (not including setup time) and doesn't require you to install and use the Velodyne-authored Windows Setup Program on your Windows computer or the TV-screen interface to manually modify the bass frequency response. Place & Play Place & Play setup doesn't require the use of the supplied microphone. You can get great sounding bass from the factory-default EQ settings with the ability to use the default preset EQ settings for different audio genres. Self-EQ Self-EQ is the simplest and fastest way to optimize the bass response from your subwoofer for your room. Self-EQ adjusts the levels of eight parametric EQs only. Unlike Auto-EQ and Manual EQ, which use the sweep tone on the enclosed CD and can adjust all settings on the subwoofer, Self-EQ uses a sweep tone generated from the subwoofer itself which is picked up using the calibrated microphone. Self-EQ smoothes the frequency response of the subwoofer from 15 to 120 Hz and leaves the settings for volume, crossover, slope and phase unchanged. Auto-EQ PLUS (Recommended) Auto-EQPLUS is recommended by Velodyne. Optimize for Your Room As a subwoofer plays in a room, the reflections of the sound waves off the walls create standing waves. Standing waves cause places in the room where certain frequencies are louder and others are diminished. Some room cancellations of the sound waves can be like black holes that no amount of amplifier power can fill. Thus, as a general rule it is better to "cut down" a peak of the frequency response rather than to "boost up" a valley. Self-EQ and Auto-EQPLUS perform this adjustment automatically for you. In general, you should try to achieve a frequency response that is +/­ 3 dB at all lower frequencies. This is because most people perceive a response curve of this accuracy level as very smooth. However, people with excellent hearing or who have been trained to listen for sonic purity can hear frequency response deviations to as small as +/- 1 dB or less. The Digital DrivePLUS Self-EQ and Auto-EQPLUS both will automatically smooth your Digital DrivePLUS subwoofer to within a +/- 3dB window. Optimize for Your Audio System How good your bass sounds also depends on how smoothly it blends with the output of the satellite speakers. If a smooth transition doesn't exist at the crossover frequency, you hear either too much mid-bass or the bass frequencies as separate from the mid and high frequencies. [. . . ] Windows® Setup Program Software To update the software: 1. Go to the Support > Downloads >Software Updates page. Click the icon to download the Windows Setup Program software. This downloaded file is an . exe file that is run from your local Windows laptop or desktop computer. [. . . ]