Setting The Input Sensitivity - Genelec HT320BC Operating Manual

Speaker mounting Bass Bass
position roll-off tilt
Free field anechoic None None
response
In a corner -2 dB -2 dB
Flush mounted in a None None
wall structure
Table 1. Suggested tone control settings in some typical situations
Figure 1. Location of the acoustic axis
Alternatively, pre-terminated lengths of
cable are available from Genelec.
Be sure not to mix the amplifier/loudspeaker
pairs when installing multiple loudspeakers
at the same time. Each amplifier and loud-
speaker delivered together are marked with
the same identification number and calibrated
together for optimal performance.
Audio input is made via a 10 kOhm bal-
anced XLR connector, but unbalanced leads
may be used as long as pin 3 is grounded to
pin 1 of the XLR. Once connection has been
made, the loudspeakers are ready to be pow-
ered up.
Access to the
front panel controls
The decorative front panel of the amplifier
is held in place by guide pins and two mag-
nets. To remove the panel, pull it straight
out.

Setting the input sensitivity

Adjustment of the input sensitivity of each
loudspeaker can be made to match that of
the signal source, by use of the input sensi-
tivity control on the amplifier front panel (see
figure 2). A small screwdriver is needed for
the adjustment. The manufacturer default
setting for this control is -6 dBu (fully clock-
wise) which gives an SPL of 100 dB @1 m
Bass Midrange Treble
level level level
None None None
-2 dB None None
-4 dB None None
Cable gauge
2,0 mm 2 (14 AWG)
3,3 mm 2 (12 AWG)
5,3 mm 2 (10 AWG)
Table 2. Recommended cable thicknesses for
different lengths of cable
with -6 dBu input level. Note that to get the
full output level of 120 dB SPL, an input level
of +14 dBu is needed at this setting.
Autostart and remote control
The HT320BC is equipped with an "Autostart"
function, which automatically turns the ampli-
fier to "standby" mode if an input signal has
not been detected for approximately thirty
minutes, and back to "on" mode when the
signal returns. The function can be deacti-
vated by turning the "AUTOSTART" dip switch
on the amplifier back panel to "OFF". A three-
colour LED on the loudspeaker indicates the
amplifier status: green for "on" and yellow for
"standby".
The amplifier mode can also be switched
by a remote control unit connected to the
respective inputs on the amplifier back panel.
Two pairs of connectors are provided, 1 and
2 for a 12 V DC type remote control, and 3
and 4 for an external switch or relay type con-
Figure 2. RAM5 amplifier panel layout
Max. length
30 m (100 ft)
40 m (130 ft)
60 m (200 ft)
trol. Do not connect two remote controls to
the loudspeaker at the same time. Activate
the function by turning the "REMOTE CON-
TROL" dip switch on the amplifier panel to
"ON". Note that the remote control function
overrides the "autostart" dip switch function.
The acoustic response of the system may
also have to be adjusted to match the acoustic
environment. The adjustment is done by set-
ting the five tone control switch groups 'Bass
Tilt', 'Bass Roll-Off', 'Bass Level', 'Mid Level'
and 'Treble Level' on the amplifier. The man-
ufacturers default settings for these controls
are 'All Off' to give a flat anechoic response.
See Table 1 for suggested tone control set-
tings in differing acoustic environments. Fig-
ure 8 shows the effect of the controls on the
anechoic response. Always start adjustment
by setting all switches to the 'OFF' position.
Then set only one switch to the 'ON' posi-
Figure 3. RCA to XLR cable
Setting the tone controls