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9S User manual

Before you start

Unpacking the subwoofer

  • Unpack the subwoofer on a clean, even and soft area; floor carpeting is very suitable.
  • The packaging should be opened from the top. Remove all accessories that come packed with the subwoofer (such as AC power cord and grille). Do not remove the top part of the protective material.
  • With the protective material still in place but with accessories removed, carefully tilt the packaging on its side and tilt again to turn it upside-down. Ensure that no part of the top-cover is obstructing the opening at the top.
  • The outer packaging can now be lifted away from the subwoofer itself. Remove the protective material that now is on top.
  • Open the bag and remove it from around the base of the subwoofer.
  • Again, carefully tilt the subwoofer on its side and again to turn it onto its feet. Note that the top part of the protective material will now come off easily so ensure that the subwoofer doesn’t drop or slide away in the process.

Check that the contents are complete:

  • Subwoofer: The factory-set power requirements (refer to label on rear of subwoofer) should correspond for the region where the subwoofer was purchased. Refer also to the Important safety instructions.
  • AC mains lead. The supplied lead should be suitable for the region where the subwoofer was purchased.

Controls and connections

1. POWER ON (Main)

Main power switch (to switch the subwoofer manually on and off). LED shows operation mode:

  • red: subwoofer switched on and in mute mode
  • green: subwoofer is activated

2. AC IN

Mains power input.

3. Power (Mode)

On: subwoofer is permanently on

Auto: subwoofer switches on when signal is detected

4. Gain

Subwoofer volume level.

5. Phase

Phase setting: phase can be set to 0° or 180°.

6. Lowpass

Subwoofer lowpass frequency: continuously variable from 50 to 150Hz.

7. SAT/SUB (output)

Output for satellite system to be connected. This signal is processed according to the Highpass setting.

8. Highpass

Allows cutting off low frequencies of the signal provided at the SUB Lowpass output:

Flat: signal is not processed

60: cutoff frequency at 60Hz

80: cutoff frequency at 80Hz

9. SAT/SUB (input)

Input for full bandwidth signal. This signal will be processed according to the Highpass setting and provided at the SAT output.

10. LFE


LFE/Slave: input for LFE signal

Slave: output to next subwoofer if installed

11. Mode

Subwoofer operation mode LFE or Slave:

LFE: setting for normal use and Master use

Slave: setting for second and all following subwoofers

Terminal pinout (sockets 9, 10 and 11)

  • 1 = 0
  • 2 = +
  • 3 = –

Damage due to improper connections!


Improper connections may damage the device.

Set the mains power switch to OFF before connecting the 9S.

Only switch the subwoofer on (mains power switch to ON) after all connections and set up steps have been properly completed.

Subwoofer inputs

The 9S provides two different signal inputs:


This input allows the LFE (Low Frequency Effect) channel to be connected. The signal is:

  • reproduced by the subwoofer
  • routed to the Slave output for a second subwoofer to be connected.

The Lowpass control has no impact on this input.


This input allows the connection of a full bandwidth signal. The signal is:

  • reproduced by the subwoofer
  • routed to the SAT output terminals. Low frequencies are cut-off according to the Highpass setting
  • routed to the Slave output for a second subwoofer to be connected. High frequencies are cut-off according to the Lowpass setting.

Connecting a single subwoofer

Connecting as LFE channel (1.)

Connect subwoofer to LFE/Slave input.

Connecting as subwoofer for satellites (2.)

  • Connect fullbandwidth signal to SAT/SUB input. Sub reproduces sum of right and left signal.
  • Set the Mode switch to LFE.


  • You can also use both connection types. The signals will be combined in the 9S and routed accordingly. This allows the 9S to reproduce both the LFE channel information as well as the bass range of the connected satellite system.
  • Use Slave mode if you want to use an external bass management system.

Multiple subwoofer connections

The 9S can be used stand-alone or together with multiple subwoofer units. Using multiple units may be helpful if the listening room is quite large or has difficult acoustic conditions. When using two or more subwoofers, the first one (designated “Master”) controls the following subs (designated “Slave”) via a subwoofer cable.

To connect multiple subwoofers:

  1. Connect the first subwoofer as described before.
  2. Set Mode switch of first subwoofer to LFE.
  3. From the Slave output of the first subwoofer connect a XLR cable to the LFE/Slave input of the following subwoofer. This one now becomes the slave.
  4. Set the Mode switch of the second subwoofer to Slave.

Further subwoofers can be connected in the same way. Set the Mode switch of all following subwoofers to Slave respectively.


When using multiple subwoofers in a Master-Slave setup, it is recommended that the subwoofers are all the same model.

If you wish to use multiple subwoofers with full individual control, set the Input switch for all to the LFE position. From the source subwoofer output, use a Y-connector.

Connecting loudspeakers

If your source bass management, you can use the 9S’s LFE input alone in LFE or SLAVE mode, depending on the management system capabilities. Avoid double processing if possible.

To connect loudspeakers

  1. Connect the subwoofer (see “Connecting a single subwoofer”).
  2. From the subwoofer SAT output connect a XLR cable to the inputs of the power amplifier you use for your speakers.


The signals connected to the inputs are provided at the Slave output for connecting another subwoofer.