This configuration provides great even audience coverage with some directivity at all but the lowest frequencies. It’s designed to be as appealing as possible and there’s little concern for realism. This implies that sound energy propagates in all directions, towards the audience but also towards any hard, solid structure located behind the subwoofer. The baffle area is doubled and, like coupling horn mouths, you will gain some additional bass extension. The red line shows the coverage at 40Hz, blue at 60Hz and green at 100Hz. Adequate adjustment of its low frequency response is necessary to keep your entire PA system in balance. This plot shows the deep nulls in the bass coverage you'll get when you position two subwoofers 20 feet apart. Now, let’s look at QSC KS Series active subwoofers’ specifications and draw some numerical conclusions. As before, spacing your cardioid subwoofer arrays yields extremely uneven coverage in the audience area. Let’s recall here the definition of the speed of sound. Mastering Essentials Part 4 - Mastering EQ: Balance, Don’t Match. Keep your head at/near knee level while listening (hence the term ‘subwoofer crawl’). Above a certain frequency they will act as a reflector and diffuser, and below this it behaves as a resonator. Hence, the sound reflected by the wall at this specific frequency will cancel the subwoofer’s forward radiation of the same frequency. Your email address will not be published. Let’s try to understand why, first. Figure 9 shows what an ideal cardioid response should look like. both facing forward and in the same polarity, will effectively produce bass omnidirectionally. Figure 9. Network Touch Screen Controller Peripherals, Qualified Network Switches and 3rd Party Setup Guides, Qualified Switches and 3rd Party Setup Guides, Network Touchscreen Controller Peripherals, PLD and CXD Series Loudspeaker Profiles for Processing Amplifiers, How to Understand All Those Loudspeaker Specs, KS Series Crossover Settings – Do and Don’t, How many Active Loudspeakers can you Daisy-Chain, California Transparency in Supply Chains Act. If the main FOH speakers are full-range types — say, 2 x 15-inch speakers or larger loudspeaker stacks — you can even use those as your 'outer' subs, but the same applies: the central subwoofer must be at least equal in level. Figure 11. Subwoofers’ Placement Guidelines. Placement of your subwoofer is important. Live Sound. For calculation simplicity, we will consider 40 and 110 Hz, which represent both ends of our subwoofer’s … While this might produce an optimal performance for the satellites, Figure 2 shows what happens to the bass response. What is the proper placement for subwoofers on or in front of a stage? Proper subwoofer placement is often overlooked but, as you're about to find out, the difference it makes to bass reproduction can be vast... All venues work effectively as two different sound environments. The placement of your satellite loudspeakers, stacks or arrays for best intelligibility and audience coverage is unlikely to coincide with the optimum bass cabinet positions — and this will be the main subject of discussion for this article. Get help moving the subwoofer if it’s a big/heavy model. subwoofer placement When you buy products through links across our site, we may earn an affiliate commission. Now that you know about it, do not forget, whenever needed, to do some simple math in order to enjoy a great bass experience. Today, subwoofers are used in many portable and installed PA applications. The good news is that many manufacturers are now bringing 18-inch and 15-inch subwoofers to market at unbelievably low prices — mostly driven, I suspect,Figure 2. One is manufactured. Even with your two coincident subs to the side of the stage, the results are much better than when spacing them some distance apart. Measure the distance between the two drivers. Due to the impact of these changing conditions, the requirements for producing optimal mid-range and treble performance are likelyIt's extremely common to see subwoofers placed on either side of the stage, in roughly the same position as the mid/top speakers — even though this is quite possibly the worst way to arrange them! This plot shows the deep nulls in the bass coverage you'll get when you position two subwoofers 20 feet apart. 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. This is a polar response of frequency distribution, showing the response and deep nulls when bass loudspeakers are placed some 20 feet apart. If, because of level requirements, you have two subwoofers, you will also benefit from close bass-cabinet coupling. PreSonus StudioLive 32SC Series III Mixing Console, Inside Track: Machine Gun Kelly 'Concert For Aliens'. Figure 7. As you can see from Figure 5, bass is not always omnidirectional. Figure 3. Place the subwoofer at or near the main listening position. Our mains are (2) Peavey SP-2s, and subs (2) Peavey 118s. To enhance the overall listening and performance experience, their placement in a room, on stage or below it is, in fact, critical. 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. It's not often you get something for nothing in this world! Where there are deep nulls in the bass response, the relative positions of theFigure 4. Other configurations with a three bass unit set are shown in Figure 6 and 7. By applying a 4ms delay to the outer pair, a useful degree of directivity (in this case, attenuation of low frequencies in the direction of the stage) can be achieved. In order to avoid these strong low frequency cancellations, we could first choose to place the subwoofer as close as possible to the back wall. It’s designed to be as appealing as possible and there’s little concern for realism. As a result, their radiation patterns display an ideal cardioid (heart) shape, with 15 dB higher level at the front than at the rear. Figure 1. To achieve the result shown in Figure 11, with controlled directivity at all bass frequencies up to your crossover point to the satellite loudspeakers, you leave the centre cardioid subwoofers set to 0ms, but apply a 2ms delay to both of the outer pairs, which are some 16ft apart. It is not quite as simple as this in practice, though: the response of the two drivers needs to be matched, and the delay between the two drivers may not be exactly as the theory shows here. Gear Head . Divide this distance by the speed of sound, which is roughly 1130 feet per second.Figure 11. subwoofer placement. You may login with either your assigned username or your e-mail address. Above a certain frequency they will act as a reflector and diffuser, and below this it behaves as a resonator. or at the back or side of the hall against a wall. All rights reserved. This equation lets us easily find the quarter wavelength for any given frequency. 30-day modular deep dive/writing challenge, How to install Waves v9 plugin on macOS Catalina.