Setting The Input Sensitivity; Setting The Tone Controls - Genelec HT320AC 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
950 mm (37 3/8 ) "
h1
GENELEC
h1= 200 mm
(7 7/8 ) "
Figure1. Location of the acoustic axis
heat so that the ambient temperature does
not rise above 35 degrees Celsius (95°F).
When soffit mounting the units it should
be noted that the cable connectors require
10 cm (4") of free space behind both the
loudspeaker and the amplifier.
Before connecting up, ensure that the
mains switch is off (see figure 2). Check
that the mains voltage selector is correctly
set and that the appropriate fuse is fitted.
The connecting cables between the
amplifier and the loudspeaker cabinet
have Speakon 8- and 4-pole connectors.
Push the 4-pole connector in and turn it
clockwise until the retaining clip clicks. The
8-pole (thicker) type is connected by push-
ing the connector in, turning it clockwise
and tightening the blue locking collar at the
end of the connector.
Audio input to the amplifier is made via a
10k Ohm balanced (XLR) lead, but unbal-
anced leads may be used as long as pin 3
is grounded to pin 1 of the XLR (see figure
3). Once connection has been made, the
loudspeakers are ready to be powered up.

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 sen-
Bass Midrange Treble
level level level
None None None
-2 dB None None
-4 dB None None
350 mm
(13 3/4 ) "
453 mm
(17 7/8 ) "
h2
h2=
500 mm
(19 3/4 ) "
sitivity control on the amplifier 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 HT320AC is equipped with an
"Autostart" function, which automatically
turns the amplifier 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 deactivated by turning
the "AUTOSTART" dip switch to "OFF". A
three-colour LED on the loudspeaker indi-
cates 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.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 control.
Do not connect two remote controls to the
loudspeaker at the same time. Activate the
function by turning the "REMOTE CON-
Figure 2. Amplifier panel layout of the HT320AC
TROL" dip switch on the amplifier panel to
"ON". Note that the remote control func-
tion 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 setting the five tone control switch
groups 'Bass Tilt', 'Bass Roll-Off', 'Bass
Level', 'Mid Level' and 'Treble Level' on the
amplifier. The manufacturers default set-
tings for these controls are 'All Off' to give
a flat anechoic response. See Table 1 for
suggested tone control settings in differing
acoustic environments. Figure 8 shows
the effect of the controls on the anechoic
response. Always start adjustment by set-
ting all switches to the 'OFF' position. Then
set only one switch to the 'ON' position to
select the response curve required. If more
Figure 3. RCA to XLR cable

Setting the tone controls