User manual VELODYNE DD-18 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. [. . . ] Your satellite speakers output the frequencies not covered by the subwoofer. You want to not be able to hear the transition from the subwoofer output to your satellite speakers' output. You can adjust this frequency from between 50 Hz to 200 Hz. If your satellite speakers are small with limited low frequency output, choose a LOW PASS FREQUENCY of between 100 Hz and 120 Hz. If your satellite speakers are larger with better low frequency output, choose a LOW PASS FREQUENCY of around 80 Hz. Adjust the LOW PASS FREQUENCY based on listening to your audio system until it sounds pleasing to your ear. Optionally, switch the subwoofer's PHASE to 180°. This reverses the phase of the subwoofer to correct for sound cancellations between your subwoofer and your satellite speakers. To determine which PHASE is best for your room and subwoofer location: a. Listen to the system with music playing. Ask a friend to switch the PHASE switch from 0° to 180° while you listen for a change in the mid-bass loudness. Follow the instructions for SETUP #1 in the Select Receiver Options for Optimal Subwoofer Performance section. Set the same wireless broadcast channel on the wireless transmitter and all subwoofers. Follow the instructions in the Select Wireless Broadcast Channel section. Follow the instructions in the Adjust Subwoofer Controls section for each subwoofer. OPTION #2: Subwoofers receive different audio signals. Usually, this setup uses one subwoofer for the R audio channel and one subwoofer for the L audio channel. If using separate R and L channel subwoofers, place each subwoofer within a couple of feet of the appropriate main speaker for the channel. If the system's crossover frequency is high, each subwoofer should be even closer to its channel's main speaker. Connect a wireless transmitter to each signal you want to transmit to a subwoofer. Usually, one for the R and one for the L channel. Follow instructions for SETUP #2 in the Connect Wireless Transmitter Section, except pair one transmitter's R input to the R channel receiver output and the other transmitter's L channel input to the L channel receiver output. [. . . ] The Federal Communications Commission warns that changes or modifications of the unit not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment. E U R O P E A N U N I O N ( E U ) D E C L A R AT I O N O F C O N F O R M I T Y This product complies with the requirements and other relevant provisions of the R&TTE Directive as well as CE-LVD (Safety) and CE-EMC (Emissions & Immunity). Radio Frequency Exposure Limit Requirements Keep a minimum separation of 8 inches (20 cm) between the transmitter and any person to comply with FCC and EU exposure limit requirements. Listen Responsibly REFRAIN FROM LISTENING TO MUSIC AT HIGH VOLUMES for long periods of time to protect you from permanent hearing damage. The United States Occupational Health and Safety Administration (OSHA) standards recommend not listening to sound levels of 85 dB for more than 8 hours and to wear hearing protection if sound levels exceed 85 dB. [. . . ]