Velodyne Digital DrivePLUSSeries - Manual (Page 15)

Recommended Locations
Based on the frequency responses, we picked Location 1 as the best place for a single subwoofer because it had the smoothest
response curve.
Also, we picked Location 4 as the best location for a second subwoofer because the peak in its frequency response at about 60 Hz was
narrower than the one in Location 2.
Location 1 Location 2
Location 3 Location 4
Figure 2: Bass Frequency Responses at each Location
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Subwoofer Placement Recommendations Guide APPENDIX A