User manual GENELEC 5050A

[. . . ] Move the subwoofer further away or try turning the amplifier side of the subwoofer towards the screen. Flush / Cabinet mounting If the subwoofer is installed in a cabinet or flush mounted in a cavity inside a wall, sufficient space must be left around it to ensure amplifier cooling and correct functioning of the driver/passive radiator system. The cavity must be at least 10 cm (4") wider and 10 cm (4") deeper and higher than the outer dimensions of the subwoofer. This allows leaving 5 cm (2") of space beside both passive radiators and sufficient space behind and above the cabinet to allow cooling for the electronics. The subwoofer's amplifier side must face the back of the cavity. [. . . ] An input voltage of -6 dBu with a -6 dBu input sensitivity setting will produce 100 dB SPL @ 1 m in free field. To obtain a 110 dB SPL output an input voltage of +10 dBu is required when the input sensitivity is set to 0 dBu. Installation Before connecting the audio signals, ensure that all equipment are switched off. The subwoofer is equipped with three pairs of IN/OUT RCA connectors marked "LEFT", "CENTER" and "RIGHT" for the main channels, parallel XLR and RCA connectors for the LFE channel and a "LINK OUT" RCA connector for daisy-chaining multiple 5050A's together. Connect the main channel audio signal RCA cables from your preamplifier or processor to the "LEFT", "CENTER" and "RIGHT" "IN" connectors. Next, connect the 6020A main loudspeakers to the subwoofer with RCA cables from the subwoofer's "LEFT", "CENTER" and "RIGHT" "OUT" connectors to the signal inputs of the corresponding main loudspeakers. The 5050A has an integrated crossover network for these three channels which directs the frequencies below 85 Hz to the subwoofer and higher frequencies through the output connectors to the main loudspeakers. When using a surround sound processor, select a loudspeaker setting "Large" for the front channels routed through the subwoofer and "Small" for the rear loudspeakers connected directly to the processor. The LFE channel of the preamplifier or processor can be connected to one of the two "LFE IN" connectors. Do not use both LFE inputs at Setting the Bass Roll-Off switches The acoustic response of the subwoofer may have to be matched to the characteristics of the room and the positioning in which it will be used. To adjust the subwoofer to match these characteristics use the `'BASS ROLLOFF' control switches located on the amplifier panel. When all roll-off switches are `OFF', a flat anechoic response is obtained. Setting the phase control The effect of incorrect phase alignment between main loudspeakers and subwoofer is a drop in the frequency response of the whole system at the main loudspeaker / subwoofer crossover frequency. The phase difference between the main loudspeakers and subwoofer at the listening position is dependent upon the position of the subwoofer. To avoid phase differences between the left and right channels and the subwoofer, the subwoofer should be placed close to the center of the front loudspeaker array. Two phase matching switches in the Figure 1. Connectors and controls of the 5050A. crossover allow compensation for incorrect phase alignment. Four settings are provided between 0° and -270°. Coarse phase correction method Connect an audio frequency signal generator to the "CENTER IN" input of the subwoofer and set the generator to 85 Hz. If a signal generator is not available, then it is possible to use an audio test recording which has a test frequency in the range 70 Hz to 100 Hz. Make sure you connect (even temporarily) a main loudspeaker to the " CENTER OUT" output, so that the test signal is properly reproduced by both subwoofer and main loudspeaker. · Toggle the -180° phase switch `ON' and `OFF' and set it to the position which gives the lowest sound level at the listening position. · Next toggle the -90°phase switch `ON' and `OFF', and again set it to the position which gives the lowest sound level. · Finally, set the -180°phase switch to the opposite setting. to the RCA "LFE IN/LINK IN" input connector of the other, "slave" subwoofer. Set the "LINK IN MODE" switch on the "slave" subwoofer to "ON". [. . . ] The function can be deactivated by turning the "AUTOSTART" dip switch to "OFF". A twocolour LED on the amplifier panel indicates the amplifier status: green for "ON" and yellow for "STANDBY". Warning! This equipment is capable of delivering sound pressure levels in excess of 85 dB, which may cause permanent hearing damage. Maintenance There are no user serviceable parts inside the subwoofer. Any maintenance of the unit must only be performed by qualified service personnel. Automatic protection circuits The 5050A is equipped with protection circuits against loudspeaker driver thermal overload and amplifier overheating. The protection system resets automatically so that the user only has to turn the input level down to ensure that it does not reactivate. Using multiple subwoofers The 5050A is equipped with a "LINK OUT" connector to provide an easy way of coupling two or more subwoofers together in high SPL applications. [. . . ]