SUB 3X12


Matt Black

"Product of the Year Award - The XTZ Cinema Series 3X12 subwoofer is one of the most powerful subwoofers we’ve ever tested."

- Josh Ricci, Audioholics - 


Is it possible to lay the 3X12 down horizontally?

Yes. It will most likely play a little louder. Depending on your room, you might need to put something under the subwoofer so the drivers are pointing straight forward or you might get a peak in some frequencies. You need to measure or listen as the result will differ between rooms.

How do I adjust the phase on my subwoofer?

When setting the correct phase, there are certain steps you must follow:

1/ Adjust the subwoofer volume to the same/similar level as the front speakers. Set the subwoofers frequency to around 80 Hz (if receiver use this crossover point)

2/ Change the phase until the bass plays as loud as possible. The highest possible volume level indicates the correct phase.

3/ Fine tune the level and frequency back and forward until you are happy with the sound.


Tip: By using the XTZ Room analyzer II Pro in RTA mode (Real Time Analyzer) with pink noise activated, you will be able to find the correct phase and which reflex port that should be sealed/open in only a fraction of the time.


Good to Know Basics:

Volume, phase and crossover frequency (also placement of listening position and placement of the sub) are depending on each other, so if one of this parameters change, then the others change as well.

So if any parameter is changed like the crossover frequency, then this will also influence the volume and phase, meaning that these will need to be adjusted as well.

In a room there is never any correct phase over the whole frequency range, so phase needs to be set for the average best result spread over the frequency range.

How to check that the sub plays in step with the main speaker.

1    First you must find the “optimal” placement of your speakers (where they perform best).

2    You will need the XTZ Room Analyzer II Pro for this.

-    Go to the “Full Range” tab in Room Analyzer.-    Measure the front/main speaker alone and save the measurement with button “1” in the Overlay, bottom right.-    Take measurements of the sub alone and save as “2” in the Overlay.-    Take measurements of the fronts and sub together and save as “3” in the Overlay.

If they play in correct phase, then the overall level (measurement 3) will be higher than the other two measurements separately. If not, then adjust the phase and repeat the steps above. Compare to measurement 3, so you know if you are on the right track. Continue adjusting the phase so the overall level is higher than the fronts / sub alone.

By changing the time delay of your subwoofer in the receiver, you will also change the phase.

You can do the same procedure with the “RTA” tab in Room Analyzer.- Run the measurement on the sub and main speakers and adjust the phase until you get the highest possible level.

What settings of the subwoofer should be chosen in a home theater system?

In a surround set, the receiver or AVR is the central hub of the system and is responsible for the bass management (allocation of spectrum to the speakers and subwoofer).

Use the following settings on the subwoofer, if you use an automatic calibration system:

- Crossover: 160Hz- Phase: 0 °
- Volume: 6db (depending on the calibration system)
- Low-pass: "OFF"EQ: "REF" (may be adjusted at any stage)
- Power: "AUTO" or "ALWAYS ON"
- Bass reflex tubes: left side open, closed right side (can be customized at any stage)

What settings of the subwoofer should be selected in a stereo system?

When using an amplifier which does not have a bass management, the Bass Management can be taken from the subwoofer. Use the following settings on the subwoofer:

- Crossover: Set the frequency response knob to a setting, which provides a seamless transition to your speakers (if you use small speakers with a shallow draft, should be chosen high frequency (z.B.100-150 Hz)). With larger speakers with stronger bass response a lower frequency (for example, 60-100 Hz) should be chosen.
- Phase: Set the phase-control dial to a setting which provides in connection with your speakers maximum bass (depending on the speaker).
- Volume: Set to a setting, which is adapted to your speakers (depending on the speaker) the volume knob.
- Low-pass: "ON"EQ: "REF" (may be adjusted at any stage)
- Power: "AUTO" or "ALWAYS ON"
- Bass reflex tubes: left side open, closed right side (can be customized at any stage)

Why does my subwoofer switch on only at high volume (Auto-On Mode)?

The switching-on of the subwoofer depends on the output of the receiver or AVR. A low output signal from the AV receiver can cause the subwoofer to turn on only at a high volume or to switch into standby-mode at music/movie parts with low SPL. A low output signal is present when the volume level of the subwoofer has a negative value in the receiver settings. To increase the sensitivity of the subwoofer, you can increase the volume level of the subwoofer in the receiver settings (after Auto Setup) manually and reduce the volume with the knob on the subwoofer to the same extent.

My subwoofer plays only very softly, why?

Often this is due to an incorrect setting of the crossover frequency. Please check that you have the controls for the crossover frequency to around 160 Hz when using an AV receiver or the switch "lowpass" is set to "Off". If you do not use an AV receiver, set the crossover frequency to the desired frequency.

At my old Subwoofer I had to turn up the volume control much less to achieve a good bass.

The volume control at XTZ subwoofers is done very precisely and thus enables a perfect adaptation to the front speakers. Unlike many other models, this can therefore not be as strongly increased compared to the rest of the hi-fi system. This does not mean that our subwoofers can play less maximum SPL. Set the level of the subwoofer simply to how much you want to hear it louder than the other speakers in the system. During the subsequent increase of the overall volume, the volume of the subwoofer will also increase.

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