Setting up your subwoofer – Earthquake Sound Front-Firing Kompressor S12 User Manual

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The Kompressor is a "true front firing subwoofer”, it must never be operated above the subharmonic / harmonic

frequency range. The Kompressor frequency response is limited by the built-in crossover (with an upper end of 160 Hz);
however, in most applications, the crossover should not be set above 80Hz to 95Hz. It is equipped with a fourth-order
Linkwitz-Riley filter which will block vocals from interfering with its performance.

When setting up the Kompressor as a part of a home audio system, users must understand that the subwoofer

requires different settings: one for music, and one for playing movie tracks. In order to set up the Kompressor for music, users
must recognize the frequency response of their existing speakers (tower & surround sound) and the limitations of these
speakers, i.e. the diameter (size) of the speakers and the SPL.

For music setting:

1- Position the Kompressor in the corner of the living room.
2- Turn the unit around to expose the controls .
3- Turn on your audio system, and switch your surround sound
processor to "MUSIC" mode, and equalize the rest of your audio system.
4- Connect the Kompressor to the processor, using high quality (triple shielded) RCA cables.
5- Set the crossover to 150Hz - maximum position, volume at minimum (0).
6- Gradually raise the main volume knob ( between the 10 O'clock to 2 O'clock) position, optimizing for the subwoofer
performance. That is when the Optical Compression Circuitry works best, allowing the amp maximum output with minimal
distortion.
7- With the crossover open to 160Hz, you will hear vocals coming out of the subwoofer. Gradually reduce the crossover point
until vocals are eliminated (typical crossing point of 80Hz).

To control the volume level of the Kompressor, use the surround sound processor output controls; do not use the main

volume knob on the Kompressor (keep it between 10 & 2 O'Clock position). Once you set up the proper mix of low frequencies
and subharmonic response, that does not encroach on the rest of the speakers. Now you are ready to set up the Kompressor
for home theater use.

For movie viewing:

The Kompressor can be set up to your liking. There are no rules of thumb to how much bass is required. Often, users

like to feel the overwhelming bass, it brings the actions and events closer to real life. When viewing movies, a 10dB gain above
music setting is often pleasant, it brings movie viewing close to life.

If you desire to have a crossover setting for music, different than the setting for movie viewing. We suggest to cross the

Kompressor at higher frequency setting, and use the processor to control the desired lower crossing point.

VOLUME

40Hz 160Hz

CROSSOVER

FREQUENCY

24dB/Oct

Crossover knob in 2 O'clock position - 90Hz @ -3dB.

0.0

-1.0
-2.0
-3.0
-4.0
-5.0
-6.0
-7.0
-8.0
-9.0

+1.0

+2.0

+3.0

+4.0

+5.0

+6.0

+7.0

+8.0

+9.0

10 20 30 40 50 60 70 80 90 100 200Hz

Level in dB.