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Auto EQ Function
The APA1200DSP offers a powerful low frequency auto EQ process for subwoofers connected in SUB (bridged)
mode. By taking 5 measurements throughout a room or around a listening position, the software will gain an
understanding of the combined response of the subwoofer within your room. With this understanding, the
device will generate 5 bands of EQ to try to generate a significantly flatter bass response throughout the room
or listening position.
You will be asked to place the microphone in 5 different locations during this process. The locations you choose
are up to you and what you are trying to achieve with the correction. If you would like the bass response to be
even throughout the entire room, choose 5 locations spread across the room to get an average response for
the room. If you would like the bass response to be as best as it can be in a single listening position, move the
microphone for each measurement, but keep it close to the listening position. (this will usually have negative
impact on the subwoofer’s sound in the rest of the room but can have great results in a single listening posi-
tion).
Following the auto EQ process, 5 bands of EQ will be applied to the connected speaker (this correction does
NOT affect the line out frequency response). These 5 bands of EQ will be modifiable via the “PEQ” menu op-
tion. You will see the “5 Band EQ” will match the results of your auto EQ and allow you to further modify the
correction to your liking.
Before you start
1. Set your desired high pass and low pass filters for your subwoofer. These high pass and low pass filters
will affect your measurements. For example, if you intend on using a subsonic filter (HPF) for your sub-
woofer, you can set that before taking measurements, or choose to do the measurements without the
HPF enabled.
2. Note that all PEQ will be disabled during the measurement process, and any values in the 5 Band PEQ
will be reset.
3. REDUCE YOUR OUTPUT VOLUME USING THE PROVIDED SLIDER. Even though your subwoofer might
not be overloaded or too loud while playing music, the test signals used for measurements will likely be
much louder than your input source. To ensure the protection of your subwoofer, reduce the volume
significantly before taking your first measurement. You can then restart the measurement process with
a higher volume if the volume was too low.
4. Use only the microphone provided in the box with the APA1200DSP. While alternative microphones
might function with the device, the auto EQ process was calibrated specifically with the style of micro-
phone that came with your device, and results will vary if using alternative mic.
