Manual

9
Sub12 Manual / English
On the front side you will find Indicator LEDs for the operating and standby
modes. Controls for the satellite filter, phase switch, signal on/continous
mode and Sub Level/Filter are located on the rear panel of the subwoofer.
The following tips are intended to assist you at using the controls in the best
manner.
5.1 LEDs
There are two LEDs on the front indicating either
operating or standby mode. In case the subwoofer
receives an overload the lower LED will flash red
indicating the function of the protective circuit.
5.2 Controls on the rear panel
a) Mode
This push button allows you to choose between
• Signal On: woofer starts operation as soon as a
musical signal arrives, and stops after 15 minutes
without a signal.
• Continuous: the unit is permanently working.
We recommend the ”Signal on” position. It
minimises power consumption and makes handling
very easy.
b) Subwoofer Phase
With the Phase Switch you can alter the phase of the subwoofer
relative to the satellites. That means to change the polarity of the bass
unit. Depending on the distance between woofer and satellites, either
0° or 180° may be the better position. We recommend to try out what
position sounds better within your system.
5. Controls
On
Standby - Protect
Sub12
8
It is common knowledge that low frequencies (below about 100Hz) are non-directional,
meaning they can hardly be located by the listener. It is, however, a common misunder-
standing that therefore the placement of a subwoofer does not matter. It does matter.
Due to the fact that every room (geometry, furniture, etc.) is unique, the following de-
scriptions intend to be a first introduction to the subject. The aim is to assist you tack-
ling the most common problems with subwoofers and room acoustics, notably interfer-
ence and standing waves.
4.1 Distance to satellites
In most set ups it is advisable to place the subwoofer not too far from the satellites
to minimize the chance of Interferences. Interference means the superposition of
two or more waves resulting in an attenuation/cancellation or enhancement of the
specific frequency/frequencies.
Furthermore, big refelexion faces in close range of the subwoofer should be avoid-
ed if possible.
4.2 Walls/Distance to walls
Generally, every wall in relative close distance to the subwoofer enhances its
sound pressure by about 6 dB. For instance, placing the subwoofer in a corner of
a room will make it about 18 dB louder. It is likely that this will result in an impair-
ment of the precision of the musical reproduction.
Another problem related to the geometrics of the room concerns the so called
‘standing waves’. These are sound waves being reciprocated between reflecting
objects, so they ‘stand’ (don’t seem to move) in between these objects. The speak-
er continues to produce new waves that combines its force with the first wave(s): a
vicious circle that results in local imbalances of the particular frequencies.
4.3 Finding the optimum position
Give it a try! The most important tool for finding the best position for your sub-
woofer are your ears. There are two rather easy ways:
You can determine your listening spot first and then compare the sound of the
subwoofer at different positions.
Another option is to place the subwoofer at the listening position and then move
around. Whereever the sound is the best the subwoofer should be positioned.
4. Subwoofer Placement