Instruction manual

4. Power Switch
Turns the subwoofer ‘ON’ or ‘OFF’ (When left in the ON position
without a signal allows the ‘STANDBY’ feature to become active).
5. IEC Socket (Mains)
Use this socket to connect to an appropriate mains socket via the
IEC Power Cable supplied.
6. AC Voltage Selector Switch
Please ensure the AC Voltage selector is in the correct position.
(See page 2).
7. High Filter
Adjustment is necessary to match the ELS Sub to the speakers
you have chosen to use in the rest of your system. As all speakers
have a different low frequency range, depending on their size and
how many drivers they use, it will be necessary to adjust the upper
cross-over point of the ELS Sub to seamlessly integrate with the
output of the front and centre channel speakers which are not
designed to provide sub-sonic bass. In addition the signal provided
to these channels is frequency limited in the receiver or decoder.
8. Phase
Adjustment is necessary to properly integrate the output of the
ELS Sub to match the respective phase of the front, centre and
rear speakers in your 5.1 system. Phase describes the polarity of
the sound waves travelling to your ears. Positive means moving
forward and negative means moving back. If the sound from your
front speakers is designed to be more positive at their low
frequency extreme, it is necessary to adjust the output of the ELS
Sub to be positive also, otherwise they will tend to cancel one
another out and reduce the level or distort or colour the sound.
There is no simple measurement for this process, which should be
done simply by trial and error. You will easily hear which setting best
suits your system after you run it with a signal and adjust the Phase
until you hear the most pleasing result.
9. Low Level Input
If your amplification system has a dedicated subwoofer output it
should be connected to the line level input. If you have a mono
connection from your amplifier you may use either connection.
The output sockets can be used if an additional subwoofer is to be
added to your system.
Note: To prevent damage to the amplifier, only connect using high
level inputs OR line level inputs. DO NOT USE BOTH METHODS
OF CONNECTION AT THE SAME TIME.
10. High level input
For systems that don't have line level or pre-amplifier outputs to
provide a full bandwidth signal to the subwoofer to deal with, it is
necessary to patch the front speakers through the sub's high level
input sockets and out of the high level output sockets on to the front
channel speakers. This cannot be recommended for the best fidelity
as it will, needless to say, be taking a high level signal from a power
amplifier and attenuating it inside the subwoofer to the level suitable
to be amplified again by the subwoofer's amplifier. Always use the
low level input for best results.
Page 6
Subwoofer Controls
Sub