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  5. Placement Recommendations Manual

Velodyne SUBWOOFER Placement Recommendations Manual

Summary of SUBWOOFER

  • Page 1

    Set up s u b w o o f e r p l a c e m e n t r e c o m m e n d a t i o n s g u i d e this guide provides recommendations on where to place your subwoofer(s) in your listening room..

  • Page 2

    I n t r o d u c t i o n introduction p l a c e m e n t c a u t i o n s subwoofer placement cautions g u i d e l i n e s general subwoofer placement guidelines single subwoofer placement guidelines twin subwoofer placement guidelines quad subwoofer placement guidelines p l a c e place a single subwoo...

  • Page 3

    Introduction this guide gives recommendations on where to place your subwoofer(s) in your listening room to: - get clean, high-impact bass - protect your subwoofer(s) from damage - avoid hazard(s) the recommendations are based on an idealized rectangular room. However, as many rooms are not rectangu...

  • Page 4

    Subwoofer placement cautions place the subwoofer cabinet on a stable, flat and level surface. An uneven or unstable surface can cause the subwoofer to tip over and cause injury and/or be damaged. This type of surface can also result in buzzing and rocking sounds that could make the subwoofer sound b...

  • Page 5

    General subwoofer placement guidelines refer to the recommended placement diagrams below for general seating and subwoofer placement guidelines. The seating positions shown in the diagrams below are general guidelines for most room types. Walls, floors and ceilings reinforce bass response. Sitting n...

  • Page 6

    Place a single subwoofer this section provides general recommendations on where to place a single subwoofer in your listening room. You can try placing a single subwoofer in the: 1. Front corner 2. In the center in front of your audio system; or 3. A quarter or third away from the front of the room ...

  • Page 7

    Place twin subwoofers this section provides general recommendations on where to place twin subwoofers in your listening room. You can try placing twin subwoofers in any of the following configurations: • one in each of two opposite diagonal corners • one in the front center and one in the rear cente...

  • Page 8

    Figure 3: recommended twin subwoofer quarter wall placements [ 6 ] subwoofer placement recommendations guide place.

  • Page 9

    Figure 4: recommended twin subwoofer center placements [ 7 ] subwoofer placement recommendations guide place.

  • Page 10

    Place quad subwoofers this section provides general recommendations on where to place four subwoofers in your listening room. You can try placing four subwoofers in either of the following configurations: • one in the center of each wall; or • one in each corner figure 5: recommended quad subwoofer ...

  • Page 11

    Figure 6: recommended quad subwoofer corner placements [ 9 ] subwoofer placement recommendations guide place.

  • Page 12

    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...

  • Page 13

    Illustrative of technique if you use the “crawl test” technique in your listening room, what you hear or the variations you see in the frequency response curves will be different than those in this document. The evaluation we did was to illustrate the validity of the “crawl test” technique. What you...

  • Page 14

    4. We set the receiver volume such that we heard a moderate music volume. 5. Our evaluator walked to each initial location and listened. The evaluator took a step in several directions around each initial location to hear what improvement, if any was heard compared to the initial location. The evalu...

  • 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 narr...

  • Page 16

    Comparison of results because not everyone has a digital drive plus subwoofer, we will now compare the results from listening to music and looking at frequency responses. This shows that with the “crawl test” technique, if you have a good ear for how bass sounds, you can choose the same locations as...

  • Page 17

    Example of change in frequency response due to change in subwoofer placement to illustrate how moving the subwoofer can impact the frequency response, we moved the subwoofer in location 4 towards the center of the room one foot. We ran the auto-eq plus optimization at each location to determine the ...

  • Page 18

    The difference is hard to see at the above scale, so we have enlarged the curves below. The first image is the original curve, and the second image the curve after moving the subwoofer one foot. Difference between the curves and parameters: • the low-pass crossover frequencies are the same, but the ...

  • Page 19

    Velodyne acoustics, inc. 345 digital drive morgan hill, ca 95037 408.465.2800 voice 408.779.9227 fax 408.465.2851 service voice 408.779.9208 service fax www.Velodyne.Com service e-mail: service@velodyne.Com general e-mail: help@velodyne.Com 63-160 rev a nov10