User manual GENELEC 8050A

[. . . ] The Minimum Diffraction EnclosureTM (MDETM) and advanced Directivity Control WaveguideTM (DCWTM) technologies provide excellent frequency balance even in difficult acoustic environments. Crossover The active crossover network consists of two parallel bandpass filters. The crossover frequency is 3. 0 kHz on the 8040A and 1. 8 kHz on the 8050A. The active crossover controls ("treble tilt", "desktop low frequency", "bass tilt" and "bass roll-off") allow precise matching of the loudspeakers to any room environment. Mounting considerations Align the loudspeakers correctly Always place the loudspeakers so that their acoustic axes (see figure 2) are aimed towards the listening position. Vertical placement is preferable, as it minimises acoustical cancellation problems around the crossover frequency. [. . . ] The surroundings of the loudspeaker must always be open to the listening room with a minimum clearance of 5 centimeters (2") behind, above and on both sides of the loudspeaker. The space adjacent to the amplifier must either be ventilated or sufficiently large to dissipate heat so that the ambient temperature does not rise above 35 degrees Celsius (95°F). Mounting options The vibration insulating Isolation Positioner/ DecouplerTM (Iso-PodTM) table stand allows tilting of the loudspeaker for correct alignment of the acoustic axis. The stand can be attached to three mounting points allowing vertical and symmetrical horizontal positioning (see figures 1 and 4). Genelec 8040A and 8050A can be fitted to Omnimount® Series 30 (8040A) and 60 (8050A) and König & Meyer loudspeaker mounts on two sets of M6x10 mm threaded holes on the back of the enclosure. On the base of the enclosure is an M10x10 mm threaded hole which can be used for securing the loudspeaker to its base. Do not use this thread for mounting the loudspeaker on a microphone stand which has a 3/8" UNC thread. and the loudspeaker. The factory settings for these controls are all "OFF" to give a flat anechoic response. Bass roll-off control Bass roll-off (first switch group from the left) affects the low frequency roll-off of the loudspeaker and attenuates its energy output near the cut-off frequency. Desktop low frequency control The desktop low frequency control (fourth switch of first switch group from the left) attenuates the bass frequencies around 160 Hz by 4 dB (see figures 8 and 10). This feature is designed to compensate for the boost often occurring at this frequency range when the loudspeaker is placed upon a meter bridge, table or similar reflective surface. Bass tilt control The bass tilt control switches (second switch group from the left) offer three attenuation levels for the bass response below 800 Hz, usually necessary when the loudspeakers are placed near room boundaries. The attenuation levels are -2 dB, -4 dB and -6 dB. Setting the input sensitivity The input sensitivity of the loudspeakers can be matched to the output of the mixing console, or other source, by adjusting the input sensitivity control on the rear panel (see figure 1). The manufacturer's default setting for this control is -6 dBu (fully clockwise) which gives an SPL of 100 dB @1m with -6 dBu input level. Setting the tone controls The frequency response of the system may also have to be adjusted to match the acoustic environment. The adjustment is carried out by setting the three tone control switch groups "treble tilt", "bass tilt" and "bass roll-off" on the rear panel of the amplifier. There is also a special "desktop low frequency" tone control which gives an attenuation of 4 dB at 160 Hz to compensate the effect of a mixing console, desk or other reflective surface between the listener Speaker Mounting Position Flat anechoic response Free standing in a damped room Free standing in a reverberant room Near field or console bridge In a corner Treble tilt None None None None None Bass tilt None -2 dB -4 dB -4 dB -4 dB Bass roll-off None None -2 dB -4 dB -4 dB Table 1. The Iso-PodTM can also be attached to the side of the enclosure for horizontal mounting. Figure 7. Carrying bag for a pair of 8040A loudspeakers. Treble tilt control Treble tilt (third switch group from the left) allows adjusting the treble response above 5 kHz by +2, -2, or -4 dB, which can be used for correcting an excessively bright or dull sounding system. An acoustic measuring system such as MLSSA or WinMLS is recommended for analyzing the effects of the adjustments, however, careful listening with suitable test recordings can also lead to good results if a test system is not available. Figures 8 and 10 show the effect of the controls on the anechoic response. [. . . ] The curves above show the effect of the "bass tilt", "treble tilt", "desktop low frequency" and "bass roll-off " controls on the free field response of the 8040A. Figure 9. The upper curve group shows the horizontal directivity characteristics of the 8040A measured at 1 m. The curves above show the effect of the "bass tilt", "treble tilt", "desktop low frequency" and "bass roll-off " controls on the free field response of the 8050A Figure 11. The upper curve group shows the horizontal directivity characteristics of the 8050A measured at 1 m. [. . . ]