Genelec 4020B, Operating Manual

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4
Bass Tilt
The Bass Tilt control offers three attenuation lev-
els for the bass response of the loudspeaker below
2 kHz, usually necessary when the loudspeakers
are placed near a wall or other room boundaries.
The attenuation levels are -2 dB (switch 3 “ON”), -4
dB (switch 4 “ON”) and -6 dB (both switches “ON”).
Bass Roll-Off
The Bass Roll-Off (switch 2) activates high-pass
filtering at 85 Hz to match the low frequency cutoff
of the 4020B to subwoofers using 85 Hz low-pass
filtering.
The factory setting for all tone controls is “OFF”
to give a flat anechoic response. Always start ad-
justment by setting all switches to “OFF” position.
Measure or listen systematically through the dif-
ferent combinations of settings to find the best fre-
quency balance.
Mounting considerations
Align the loudspeakers correctly
Always place the loudspeakers so that their acous-
tic axes (see figure 1) are aimed towards the center
of the listening area. Only vertical placement is pre-
ferred, as it minimises acoustical cancellation prob-
lems around the crossover frequency.
Minimise reflections
Acoustic reflections from objects close to the
loudspeakers like walls, cabinets etc. can cause
unwanted colouration blurring of the sound im-
age. These can be minimised by placing the loud-
speaker clear of reflective surfaces.
Minimum clearances
Sufficient clearance for cooling of the amplifier and
functioning of the reflex port must be ensured if
the loudspeaker is installed in a restricted space
such as a cabinet or integrated into a wall struc-
ture. The surroundings of the loudspeaker must
always be open to the listening room with a mini-
mum clearance of 3 centimeters (1
3
/
16
”) behind,
above and on both sides of the loudspeaker. The
space adjacent to the amplifier must either be ven-
tilated or sufficiently large to dissipate heat so that
the ambient temperature does not rise above 35
degrees Celsius (95°F)
Mounting options
The Genelec 4020B offers several mounting op-
tions: On the base of the loudspeaker is a 3/8”
UNC threaded hole compatible with a standard
microphone stand. On the rear there are two
M6x10 mm threaded holes for Omnimount
®
size
Table 1: Suggested tone control settings for differing acoustical environments
Loudspeaker Mounting Position Treble Tilt Bass Tilt Bass Roll-Off
Flat anechoic response OFF OFF OFF
Free standing in a damped room OFF OFF OFF
Free standing in a reverberant room OFF -2 dB OFF
Near field or desktop OFF -4 dB OFF
Near to a wall OFF -6 dB OFF