Operating Manual
HTS6
Genelec HTS6
Active Subwoofer
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Figure 2. XLR to RCA connector for
unbalanced operation.
Subwoofer placement
Bass Roll-Off
setting
Near to a wall
In a corner
-2 dB
-6 dB
-2 dB
Flush mounted
Figure 1. HTS6's connector panel, connectors and controls.
Table 1. Suggested Bass Roll-Off settings
symmetrically and at an equal distance from
the listening position.
front of the grilles.
subwoofer. An input voltage of -6 dBu with a
-6 dBu input sensitivity setting will produce
100 dB SPL @ 1m in free field. To obtain a
110 dB SPL output an input voltage of +10
dBu is required when the input sensitivity is
set to 0 dBu.
The reflex port and connector panel should
always have a clearance of at least 20 cen-
timeters (8") to any objects to ensure proper
function of the port and cooling for the elec-
tronics attached to the connector panel.
If the frequency balance is not right, try
moving the subwoofer slightly to the left or
right so that different room modes are
excited at different levels. Positioning the
subwoofer close to a corner will boost the
bass level at lower frequencies and may
cause asymmetrical spatial imaging. If you
are using two subwoofers, try placing them
asymmetrically relative to the side walls.
Sometimes moving the subwoofers apart
into the front corners helps with problematic
rear wall reflections and the loss of mutual
coupling is compensated by the bass boost
caused by corner positioning.
Flush mounting the subwoofer
Setting the Bass Roll-Off
switches
If the subwoofer is flush mounted into a
wall or a cabinet, it is important to ensure
unrestricted airflow from the reflex port
and cooling for the electronic components.
This can be done by making the recess 20
centimeters (8") wider than the subwoofer.
Place the subwoofer into the right end of
the recess with the drivers' side facing the
room. This leaves sufficient 20 centimeters
(8") of free space on the connector panel and
reflex port side. The height and depth of the
recess should not be any bigger than those
needed to fit the subwoofer flush with the
wall surface.
The acoustic response of the subwoofer may
have to be matched to the characteristics of
the room and the positioning in which it will
be used. To adjust the subwoofer to match
these characteristics use the ''Bass Roll-Off'
control switches located on the connector
panel. Table 1 provides some suggestions
for the "Bass Roll-Off" switch settings. When
all roll-off switches are set to "OFF", a flat
anechoic response is obtained.
Although the HTS6 subwoofer is magneti-
cally shielded, they may cause some picture
distortion if placed near very sensitive video
monitors or computer displays.
Setting the phase control
Minimum clearances to walls
or other objects
The power amplifiers are attached to the
lower part of the aluminium grilles, which
function as a heatsink. Do not cover the
grilles or place the subwoofer so that there is
less than 10 centimeters (4") of free space in
Incorrect phase alignment between main
monitors and subwoofer causes a drop in
the frequency response of the whole system
at the crossover frequency. The graphs on
the following page (Fig. 4) show the effect of
phase difference to the frequency response.
The phase difference between the main
Setting the input sensitivity
The subwoofer requires input sensitivity
alignment to the source to obtain a correctly
balanced system. The input sensitivity con-
trol is located on the connector panel of the
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Phase Difference: 0˚
Phase Difference: 90˚
120 Hz
120 Hz
Remote
control type
Pole or
contact
Connect to
remote control
input pin no.
Phase Difference: 270˚
Phase Difference: 180˚
12 V DC
remote
control
+
-
1
2
120 Hz
120 Hz
External
switch or
relay
Contact 1
Contact 2
3
4
Connect only one remote control unit at a time
Table 2. Remote control connector pin sequence
Figure 4. The effect of phase difference between the subwoofer and the main speakers
speakers and subwoofer at the listening
position is dependent upon the position of
the subwoofer, so the phase adjustment
should be done only after the preferred posi-
tion is found. Acoustic measuring equipment
is required for accurate system alignment. If
this equipment is not available, the following
coarse phase matching can be applied.
Toggle the -180°
bass level increases by 6 dB. Three
subwoofers give an bass SPL increase of 9,5
dB and four subwoofers 12 dB compared to
a single subwoofer. Adjust the sensitivity con-
trol of all subwoofers in the group to match
the SPL level with the main speakersystem.
Note that the sensitivity setting must be the
same on all subwoofers.
phase switch ‘ON’
and ‘OFF’ and set it
to the position which gives the lowest sound
level at the listening position.
Next toggle the -90°
phase switch ‘ON’ and
‘OFF’, and again set it
Coarse phase adjustment
method
Autostart and remote control
to the position which gives the lowest sound
level.
The HTS6 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 five min-
utes, and back to “ON” mode when the signal
returns. The function can be deactivated by
turning the “AUTOSTART” dip switch to “OFF”.
A two-colour LED on the connector panel indi-
cates the amplifier status: green for “ON” and
yellow for “STANDBY”.
Configure the processor so that the main
speakers (L, C, R) are set to “small” and
check the subwoofer crossover frequency
setting on your processor. This setting may
be either fixed or variable, consult the operat-
ing manual of your processor.
Finally, set the -180°
phase switch to the
opposite setting.
Using multiple subwoofers
Connect an audio frequency signalgenera-
tor to one of the front L, C or R input channels
used in the system.
The HTS6 is equipped with a “LINK OUT”
connector to provide an easy way of coupling
two or more subwoofers together in high
SPL applications. Connect a XLR cable from
the “LINK OUT” connector of the “master”
HTS6 to which the main monitor channels
are connected, to the “XLR IN” connector of
the other, “slave” subwoofer.
Set the frequency generator to the same
frequency as the subwoofer crossover
frequency on your processor.
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
subwoofer at the same time. Remote control
overrides the “AUTOSTART” function.
If a signal generator is not available, you
can use an audio test recording with a suit-
able range of test frequencies. Mute all other
channels and perform the adjustment with
only one of the front speakers playing.
When two subwoofers connected in this
way are positioned close to one another,
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GENELEC
GENELEC
GENELEC
GENELEC
Figure 6. Flush mounting the subwoofer. Note the clearance needed on the reflex port side.
ABSORBING
HEAVY WOODEN
MATERIAL
OR CONCRETE
HEAVY
WOODEN
WALL
OR
CONCRETE
WALL
VIBRATION
VIBRATION
ISOLATORS
ISOLATORS
f ~ 2-8 Hz
Figure 5. The curves above show the
harmonic distortion analysis of the HTS6
in free field. In half space the SPL will be 6
dB higher.
f ~ 2-8 Hz
Figure 8. Correct flush mounting in a semi-
absorbing wall.
Figure 7. Flush mounting the subwoofer in a
non-absorbing wall.
ABSORBING
MATERIAL
HEAVY
WOODEN
OR
CONCRETE
WALL
Automatic protection circuits
• Always use a mains power connection
with protective earth. Failing to do
this may lead to personal injury.
• Note that the amplifier is not completely
disconnected from the AC mains
service unless the mains power cord is
removed from the amplifier or the
mains outlet
The HTS6 is equipped with protection circuits
against speaker driver thermal overload and
amplifier overheating. The protection system
resets automatically so the user only has to
turn the input level down to ensure that it
does not reactivate.
VIBRATION
ISOLATORS
f ~ 2-8 Hz
Figure 9.Incorrect flush mounting in a semi-
absorbing wall.
Safety considerations
Warning!
The HTS6 subwoofer has been designed in
accordance with international safety stand-
ards. However, to ensure safe operation and
maintain the unit in safe operating condition,
the following warnings and cautions must be
observed:
This equipment is capable of delivering
sound pressure levels in excess of 85
dB, which may cause permanent hearing
damage.
Maintenance
No user serviceable parts are inside the
amplifier unit. Any maintenance of the unit
must only be performed by qualified service
personnel.
• Do not expose the subwoofer to water
or moisture. Do not place any objects
filled with liquid, such as vases on
the subwoofer or near it.
Guarantee
• Servicing and adjustment must only
be performed by qualified
This product is supplied with a two year guar-
antee against manufacturing faults or defects
that might affect the performance of the unit.
Refer to supplier for full sales and guarantee
terms.
service personnel.
• Opening the connector panel is
strictly prohibited except by
qualified service personnel.
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HTS6 Operating Manual
SYSTEM SPECIFICATIONS
AMPLIFIER SECTION
HTS6
HTS6
Short term amplifier output
power (Long term output power
is limited by driver unit
Free field frequency response
(+/- 3 dB)
19 Hz…120 Hz
protection circuitry)
1000 W
Maximum short term sine wave
SPL output averaged from
30 to 85 Hz, measured in
half space at 1 meter
Amplifier system distortion
at nominal output
THD
124 dB SPL
129 dB SPL
20 dB
0.05%
Maximum peak SPL output with
random pink noise, measured
in half space at 1 meter
Mains voltage
100/200V
or 115/230V
Power consumption (average)
Self generated noise level in
free field @ 1 m on axis
(A-weighted)
Idle
Full output
60 VA
1000 VA
Harmonic distortion
@ 105 dB SPL
30 … 85 Hz
2 %
at @ 1 m on axis in half space
2nd
3rd
2 %
Drivers
Weight
4 x 305 mm (12”)
120 kg (265 lbs)
INPUT SECTION
HTS6
Dimensions
Height
524 mm (20 5/8”)
1440 mm (56 11/16”)*
558 mm (22”)
Input connector XLR female
Width
Depth
pin 1
pin 2
pin 3
gnd
+
–
* If the subwoofer is flush mounted into a wall or a cabinet, the recess must be 20 cm (8”)
wider than the subwoofer to allow sufficient clearance for the reflex port situated at the end
of the subwoofer enclosure.
Input impedance
10 kOhm balanced
Input level for 100 dB SPL
output @ 1 m
Variable from +6 to –12 dBu
CROSSOVER SECTION
HTS6
Subsonic filter
(18 dB/octave) below
19 Hz
LINK OUT CONNECTOR
Upper bandwidth
120 Hz
HTS6
Crossover slopes
Lowpass
Output connector XLR male
36 dB/octave
12 dB/octave
pin 1
pin 2
pin 3
gnd
+
–
Highpass
Midband rejection >400 Hz
50 dB
Link Out gain
0 dB
Bass roll-off control operating
range in 2 dB steps
From 0 to –6 dB @ 20 Hz
Phase matching control
in 90° steps
From 0 to 270° @ 85 Hz
Genelec Document D0053R001a. Copyright Genelec Oy 12.2003. All data subject to change without prior notice
International enquiries:
In the U.S. please contact
Genelec, Olvitie 5
Genelec, Inc., 7 Tech Circle
Natick, MA 01760
FIN-74100, Iisalmi, Finland
Phone +358 17 83 881
Fax +358 17 812 267
Phone +1 508 652 0900
Fax +1 508 652 0909
Email [email protected]
Email [email protected]
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