Genelec Speaker HTS6 User Manual

Operating Manual  
HTS6  
Genelec HTS6  
Active Subwoofer  
 
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  
 
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,  
 
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.  
 
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  
 

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