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
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-
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.
Setting the tone controls
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 2. RAM5 amplifier panel layout
Table 1. Suggested tone control settings in some typical situations
Figure 3. RCA to XLR cable
Speaker mounting
position
Bass
roll-off
Bass
tilt
Bass
level
Midrange
level
Treble
level
Free field anechoic
response
None
None
None
None
None
In a corner
-2 dB
-2 dB
-2 dB
None
None
Flush mounted in a
wall structure
None
None
-4 dB
None
None
Figure 1. Location of the acoustic axis
Cable gauge
Max. length
2,0 mm
2
(14 AWG)
30 m (100 ft)
3,3 mm
2
(12 AWG)
40 m (130 ft)
5,3 mm
2
(10 AWG)
60 m (200 ft)
Table 2. Recommended cable thicknesses for
different lengths of cable
