APPENDIX A
Case Study:
Determining Optimal Subwoofer Placement using the “Crawl Test” Technique in Velodyne’s Listening Room
Overview
To illustrate the use of the “Crawl Test” Technique described in the Subwoofer Placement Recommendations Guide, we used this technique to
determine the best locations for subwoofers in the Velodyne listening room.
Room Layout and Subwoofer Locations Evaluated
The drawing below shows the layout of the Velodyne listening room and the subwoofer locations evaluated.
The room is located near the center of the offices and, hence, has no windows. The room’s two doors and the walkway between them can’t
be blocked by subwoofers. Also, access to the storage cabinets can’t be obstructed by a subwoofer. The main listening seat is located at
about two-thirds of the length of the side walls and in the center of the length of the front and rear walls. Our satellite speakers were located
on each side of the TV. The doors were closed for this evaluation.
The initial spots we choose for evaluation as possible locations for subwoofers were based on the general placement guidelines and open
areas of the room. These locations were adjusted slightly based on what the evaluator heard at the initial locations. The final evaluated
locations were:
• Location 1:
Left front corner.
• Location 2:
Left side wall between the door and storage cabinet.
• Location 3:
Center back wall.
• Location 4:
Right side wall about 1/4 way between storage cabinet and wall.
We used a DD-10+ 10” Digital Drive
PLUS
subwoofer for our evaluation so that we could compare the results from listening to music to those
obtained with the frequency responses.
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Subwoofer Placement Recommendations Guide
APPENDIX A
