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Nov 28

The quarter wavelength is 1.0 m (3.3 ft). Figure 8. If you have three subwoofers, or one sub and two full-range satellites, arranging them as shown here yields both smoother coverage than spaced speakers alone, as well as reduced dispersion to the left and right sides of the stage. As in every rule, there are exceptions. subwoofer placement When you buy products through links across our site, we may earn an affiliate commission. the only proviso being that it must be matched to or at a slightly higher level than the two either side. Place the subwoofer at or near the main listening position. In all KS Series subwoofers, the ultra-compact, single 12-inch KS112 has the widest frequency response (-6 dB) that spans from 41 to 108 Hz. I hope that this article has gone some way to illustrating how you can achieve great sound for every member of your audience, and how you can avoid some of the basic pitfalls of subwoofer or bass loudspeaker placement. Save my name, email, and website in this browser for the next time I comment. Again, the inner pair might be a full-range loudspeaker but the optimum would be four identical subwoofers, and two satellites that could sit on stands mid-way between the subs on either side. Subwoofers’ Placement Guidelines. The red line shows the coverage at 40Hz, blue at 60Hz and green at 100Hz. There are now various cardioid-pattern subwoofers available, with the directionality either built into a single cabinet, or achieved through arrays. Figure 3. To achieve the response in Figure 8, you need to apply a delay of 4ms to the outer (blue) pair. In that case, using our numerical findings above our subwoofers can be placed either; In doing so, you will ensure that the subwoofer’s low frequency reproduction remains unaltered over the entire band pass. This might be a good arrangement for venues in close proximity to those who may complain about the noise! Even with your two coincident subs to the side of the stage, the results are much better than when spacing them some distance apart. A microphone and RTA can be used to optimise the results, or you can just walk behind the array and use your ears! This plot shows the deep nulls in the bass coverage you'll get when you position two subwoofers 20 feet apart. This is because though a subwoofer is the best alternative for the improper sound speakers, the same may not work appropriately if they are not installed properly. Figure 7. The dispersion characteristic of two spaced subwoofers either side of the stage, and one subwoofer 20 feet in front, firing towards the stage. This is a polar response of frequency distribution, showing the response and deep nulls when bass loudspeakers are placed some 20 feet apart. As subwoofers only generate low frequencies, typically well below 200 Hz, all types of subwoofer design – apart from cardioid solutions – produce an omnidirectional sound radiation. How to use our findings? So you have decided that the purchase of one or more subwoofers is a Good Thing in all respects. All rights reserved. While this might produce an optimal performance for the satellites, Figure 2 shows what happens to the bass response. This will ensure that the low frequency output is not compromised, because there is no distance behind the subwoofer. These locations will provide even better loading, providing natural bass boost from the large floor/wall area the cabinets are placed against, but may not be practical locations. Where there are deep nulls in the bass response, the relative positions of theFigure 4. I am not sure who advises schools and theatres as to where to Figure 3. The dispersion characteristic of two spaced subwoofers either side of the stage, and one subwoofer 20 feet in front, firing towards the stage. These alternative cabinet-loading methods have advantages, but in all cases, EQ and more power are required to match the equivalent response of a single driver in a larger bass-reflex or sealed cabinet. Figure 10. Figure 9 shows what an ideal cardioid response should look like. Some people advise us to place them on the floor … Adding a central cardioid subwoofer array to the two either side, and subjecting the outer arrays to a 2ms delay (assuming a spacing of 16 feet), improves things significantly. The advantages of removing bass frequencies from the satellites, stacks or arrays are numerous. Page 1 of 2. Figure 6 has the flanking speakers spaced wider, and the central subwoofer turned 180 degrees and placed 20 feet from the stage. Your email address will not be published. The baffle area is doubled and, like coupling horn mouths, you will gain some additional bass extension. Of course, you could buy ready-made cardioid loudspeakers... or you can create your own! One is manufactured. The dividing point between these conditions is known as the Schroeder frequency, and it usually falls between 100Hz and 200Hz, depending on the room's dimensions and shape. Within the scope of the article it has only been possible to show a few examples of what is achievable by cabinet placement alone, and we've only touched on what is possible with the introduction of delays. two units) do not radiate sound omni-directionally. At the longer wavelengths we're dealing with, the physical distance betweenFigure 5. Now, we have to get really clever with our DSP loudspeaker management unit, and work with both the input delays.

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