How you proceed depends on your equipment, room shape, and furnishings. A single subwoofer can impose limitations you may not be able to fully correct (I experienced this). The following checklist outlines practical things to test and verify to improve bass performance:

1. Setup your microphone and laptop and connect it to your Receiver/Amplifire.
2. Reset the subwoofer settings on your receiver/amplifire and subwoofer.
3. Find you best subwoofer plaement. Click here for video tutorial.This video will also show you how to setup you MIC and use REW.
4. When you find the best Subwoofer position then you can try to play with the list of tip below.
5. Remeber to meassure after every change to verify that you are going in the right direction.

If you want to watch a video that will explain most of the tip in my list click here

• Try different subwoofer placements (see examples here)
• Try the subwoofer crawl method
• Move your listening position if possible
• Rotate the subwoofer driver to aim in different directions
• Apply Room Gain Compensation (RGC) if available
• Adjust subwoofer phase
• Verify port tuning or use a sealed/ported configuration as appropriate
• Check polarity (invert if needed)
• Tune parametric EQ using measurements
• Relocate or remove large furniture that affects bass
• Check receiver settings (crossover, level, speaker distance)
• Run Audyssey (or your room correction) calibration
• Disable Audyssey LFC (Low Frequency Containment) if it degrades bass
• Turn off “LFE+Main” if it causes double-bass or overload
• Disable/Enable “Dynamic EQ” and “Dynamic Volume” if they alter tonal balance