User manual DYNAUDIO AUDSUB

[. . . ] Never use cleansers or chemicals. Important Safety Instructions Sound pressure level Please note that excessive listening at high sound pressure levels may cause permanent hearing damage. Warning This equipment can produce sound pressure levels in excess of 90 dB(A) Unpacking Every loudspeaker leaving Dynaudio has been carefully and thoroughly inspected and tested. When unpacking the subwoofer, be sure to check if any physical damage has occurred to the subwoofer due to shipping. When unpacking the subwoofer, verify that the voltage switch is positioned according to the required voltage. Contents ABOUT THIS PRODUCT OPERATION AND LOCATION OF CONTROLS Level Crossover frequency Phase / Phase switch Input terminal Right and Left / Input terminal Mono Output switch / Output terminal Right and Left Utility Link terminal Input/Output Standby Subsonic filter Protection circuit Power switch AC inlet Voltage switch Fuse-drawer INSTALLATION Multi-channel sound system POSITIONING TROUBLESHOOTING No sound Distorted sound SPECIFICATIONS 6 7 8 8 8 9 9 10 10 10 11 11 11 11 11 12 13 14 15 15 15 16 About This Product The Dynaudio subwoofer provides quality low frequency output to extend the frequency range of the speaker system, and offers enhanced low bass when used as a dedicated subwoofer in an A/V or surround system. The SUB-20A is fitted with a 24 cm (9. 5 inch) woofer, and the SUB-30A is fitted with a 30 cm (12 inch) woofer. [. . . ] Do not connect any of these inputs to high level signals such as power amplifier speaker outputs!If a SUB OUT terminal (or equivalent) is not present on the pre-amp/processor, then connect the subwoofer via PRE OUT to <IN R> and <IN L>. Output switch / Output terminal Right and Left The output terminals are intended for use when a separate power amplifier or integrated amplifier with separate inputs is available. Using this output enables the removal of frequencies below 80 Hz from the main speakers by setting the switch to < Lowcut 80 Hz>. With the output switch in the <Flat> position, the input terminals are connected directly to the output terminals. With the output switch in the <Lowcut 80 Hz> position, the signal passes through an active second order (12 dB/octave, f-3dB = 80 Hz) high-pass filter. This selection cuts frequencies below 80 Hz to the main speakers, thereby reducing potential distortion. Utility Link terminal Input/Output If two Dynaudio subwoofers are to be used, they may be connected via the Utility Link. This feature is intended for use with a multichannel surround sound system. In discreet surround sound systems such as AC-3, MPEG- 2, and DTS, all 5 channels can be full range. With the Dynaudio Utility Link, the two subwoofers sum all these channels into one mono subwoofer channel, reproduced by the two subwoofers. Connect all outputs from the surround sound system to <IN Mono>, <IN R> and <IN L> on both subwoofers arbitrarily. More on this setup is mentioned later in the manual. Standby The subwoofer has an internal standby function. The standby will be activated when there is no input signal to the subwoofer for 10 minutes. When powering on and off, the mute circuit will mute both the subwoofer itself and the output terminals. This ensures that no noise can be heard in the subwoofer and in the main speakers (if using the outputs). Due to a very low standby power consumption, the subwoofer power switch may be left on continuously. If unused for several days, it is recommended to switch off the main power or disconnect the device from the main outlet. When using the 80 Hz low frequency cut-off for the main speakers, do not switch off the power for the subwoofer while the sound system is playing. After a few minutes music should become present in the main speakers, but very attenuated. This is not a fault, but merely a result of signal passing through the electronics when no power is supplied. If listening is desired while the subwoofer is switched off, set the output switch to position <Flat>. Subsonic filter The subwoofer has an active second order (12 dB/octave below 20 Hz) subsonic filter to prevent rumble, speaker distortion, or overload situations caused by signals that cannot be heard. Protection circuit To prevent thermal overload, the mute circuit will be activated at 65°C (149° F) and will be automatically deactivated when the temperature drops to 50°C (122° F). Under normal conditions this should rarely occur. Power switch Switches the power on and off. When the subwoofer is on, the power switch lights up. AC inlet This is a grounding-type plug. [. . . ] It is very important that all controls and switches are set in the same position on both subwoofers. Use the three inputs <Left>, <Right>, and <Mono> on the first subwoofer for the respective Left Front, Right Front, and Center channels. On the second subwoofer use the Left, Right, and Mono input for the Left Rear, Right Rear, and Subwoofer channels (Fig. C) Positioning Useful hints: Best results are usually achieved with the subwoofer aimed towards the listening area, positioned between the main loudspeakers and near the wall. [. . . ]