User manual GENELEC 7050B

[. . . ] Next connect XLR cables from the corresponding "OUT" male XLR connectors on the upper row to the input connectors of each main loudspeaker. Turn the volume control knob on all main loudspeakers fully clockwise and switch the "BASS ROLL-OFF" dip switch (switch 2) on all main loudspeakers to "ON". This switch actuates an 85 Hz highpass filter on the main loudspeakers matching them to the main channel lowpass filter of the subwoofer. Alternatively, you can connect a stereo pair of loudspeakers by routing the signal cables from the source to the input connectors of the main loudspeakers and an another pair of cables from the main loudspeakers' output connectors to the "IN" connectors on the 7050B. [. . . ] Positioning the subwoofer close to a corner will boost the bass level at lower frequencies and may cause asymmetrical spatial imaging. Although the 7050B is magnetically shielded, it may cause colour distortion if placed near to very sensitive video loudspeakers or computer displays. Move the subwoofer further away or try turning the driver side of the subwoofer away from the screen. any objects to ensure proper functioning of the reflex port. Flush mounting the subwoofer If the subwoofer is flush mounted into a wall or a cabinet, it is important to ensure amplifier cooling and unrestricted airflow from the reflex port. This can be done by making the recess 7, 5 centimeters (3") wider than the subwoofer. Place the subwoofer into the right end of the recess with the driver side facing the room. This leaves sufficient 7, 5 centimeters (3") of free space on the reflex port side. The height and depth of the recess should not be any bigger than is needed to fit the subwoofer flush with the wall surface. Minimum clearances to walls or other objects Do not cover the driver side of the subwoofer or place the subwoofer so that there is less than 10 cm (4") of free space in front of the grille. Make sure that the space underneath the subwoofer is clear from obstructions. Thick carpets may block the ventilation clearance needed for cooling the electronics. The reflex port side (opposite of the connector panel side) should always have a clearance of at least 7, 5 centimeters (3") to Sensitivity adjustment The subwoofer requires input sensitivity alignment to the source to obtain a correctly balanced system. The input sensitivity control is located on the connector panel of the subwoofer. An input voltage of -6 dBu with a -6 dBu input sensitivity setting will produce 100 dB SPL @ 1 m in free field. Setting the phase control Incorrect phase alignment between the main loudspeakers and subwoofer causes Subwoofer placement Near to a wall In a corner Flush mounted Bass Roll-Off setting -2 dB -6 dB -2 dB Phase Difference: 0° Phase Difference: 90° Table 1. Suggested Bass Roll-Off settings 85 Hz 85 Hz Phase Difference: 180° Phase Difference: 270° 85 Hz 85 Hz Figure 5. Note the clearance needed on the reflex port side. Figure 4. The effect of phase difference between the subwoofer and the main loudspeakers a drop in the frequency response of the whole system at the crossover frequency. 4) show the effect of phase difference to the frequency response. The phase difference between the main loudspeakers and subwoofer at the listening position is dependent upon the position of the subwoofer, so the phase adjustment should be done only after the preferred position is found. Acoustic measuring equipment is required for accurate system alignment. If this equipment is not available, the following coarse phase matching can be applied. to the position which gives the lowest sound level at the listening position. Next toggle the -90° phase switch (DIP 4) "ON" and "OFF", and again set it to the position which gives the lowest sound level. Finally, set the -180° phase switch (DIP 5) to the opposite setting and deactivate the test signal. Change the -180° switch to the opposite setting. The phase should now be set correctly and the frequency analyser should show a smooth response around 85 Hz. Using the LFE Bandwidth and LFE +10 dB functions The "LFE BANDWIDTH" switch allows you to select the upper cutoff frequency of the LFE channel between 85 and 120 Hz. [. . . ] Note that the amplifier is not completely disconnected from the AC mains service unless the mains power cord is removed from the amplifier or the mains outlet. Warning!This subwoofer is capable of delivering sound pressure levels in excess of 85 dB, which may cause permanent hearing damage. Maintenance No user serviceable parts are inside the subwoofer. Any maintenance of the unit must only be performed by qualified service personnel. Guarantee This product is supplied with a ONE year guarantee against manufacturing faults or defects that might alter the performance of the unit. Refer to supplier for full sales and guarantee terms. Figure 6. [. . . ]