BOSS Audio Systems AVA1204 7 Band Pre-Amp Equalizer with Remote Subwoofer Level Control

Front panel controls
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Front Panel Controls

1. LED Level Meter
2. Subwoofer frequency selector: This control is used to set the center frequency for the subwoofer channel at either 50Hz or 150Hz. This establishes the point in the frequency spectrum where the subwoofer level control will have the greatest effect.
3. Subwoofer level control: Although the AVA1204 does not have an overall level control (you set the volume level for your system from the head unit), it features an independent level control for the subwoofer channel. This gives you the ability to balance the amount of bass in the audio mix to your personal taste.
4. Boost/Cut Controls: Each of these controls represents a range of frequencies surrounding a center frequency to cover the audio spectrum from subwoofer to treble. Adjust these controls to suit your taste and listening environment. Each center frequency can be adjusted +/- 12 dB.
5. EQ On/Off Selector: This button permits you to turn on or off the equalization provided by the AVA1204.
6. X-Bass Processor On/Off: The AVA1204 features a BASS enhancement circuit called X-BASS. Use this when you want to emphasize the bass portion of your audio.