This method is often called cardioid subwoofer array or csa even though the pattern of all directional subwoofer methods is cardioid. The ks212c is the worlds firstinclass singlebox powered cardioid subwoofer solution for highly portable entertainment and installation applications. Socratic meta featured answers topics how do i find the area inside a cardioid. Wide cardioid is excellent for recording acoustic guitar and small vocal groups. Jun 15, 2017 if you have only one sub it should always be used in normal mode. All cardioid arrays trade rear cancellation for reduced forward. So this darker curve in blue is the graph of r is equal to 1 minus cosine of theta, of course were dealing in polar coordinates here. It helps you design, in realtime, cardioid configurations like endfired and gradient.
Subwoofer box enclosure comparison calculator sealed ported. We would like to provide some additional information regarding our ease files as we represent our products differently than other manufacturers. You can use up to 12 speakers with omnidirectional, cardioid. Apart from the major patterns omni, cardioid, and figure8, there are some varieties of the cardioid pattern, the best known being wide cardioid and super or hypercardiod. Another cardioid subwoofer array pattern can be used horizontally, one which takes few channels of processing and no change in required physical space. Cardioid arrays can be used to keep bass off of a stage, stop destructive reflections, or just keep the bass aimed the intended toward. This page allow you to compare the different types of subwoofer box enclosures for a particular driver. Wolframalpha brings expertlevel knowledge and capabilities to the broadest possible range of peoplespanning all professions and education levels. The trace of one point on the rolling circle produces this shape. Use the speaker box designer to determine the correct speaker box volume for your driver. It helps you design, in real time, cardioid configurations like endfired and gradient. Wavelength just about everything having to do with loudspeaker array acoustics is relative to wavelength. Our ease files are calibrated to show avg spl, and will be comparable to mapp avg spl. In addition, you can also use the software with flown and ground stacked jbl vtx subwoofer arrays.
Subwoofers with proprietary passive cardioid technology eliminate excessive rear radiation by up to 10db without the extra cost, space requirements and inconvenience of active cardioid subwoofer. Cardioid subwoofer arrays can be used to direct the output of an array of subwoofers in order to limit excessive amounts of bass in undesired locations. The more recent ones contain an additional instruction set for cardioid settings. Qsc k cardioid dual 12 w powered subwoofer the k cardioid subwoofer represents the worlds firstinclass singlebox powered cardioid subwoofer solution for highly portable entertainment and installation applications. The calculation of sealed, bassreflex, bandpass boxes by thielesmall parameters. Oct 20, 2017 here is a quick overview of the routing on my board, and how i assign two outputs to a single mono channel do you control my subwoofers. The cardioid has the diameter 2a on its symmetry axis. Some moore post regarding sub arrays are also available but they show the difference between no wallsfree fieldwith walls. A cardioid is a mathematical shape that resembles a heart or the cross section of an apple cut in half. Sub array calculators have been available for many years from. In three dimensions, the cardioid is shaped like an apple centred around the microphone which is the stalk of the apple. In this post, ive assembled this easytoread guide entitled a beginners introduction to microphone polar patterns. Cardioid subwoofers and nexo technology part 2 duration.
Subwoofer enclosure calculators, parallel, series, port. Csa cardioid sub array timos world all around the globe. Physical arc and delayed straight horizontal arrays. Cardioid is also the conchoid of a circle of radius r with respect to a fixed point on the circle, and offset 2 r. A box or array is large if its dimensions or some of its dimensions are more than about 1. In others words, any chord of cardioid passing its. The types include sealed, ported and bandpass enclosures.
If youve got questions, and you want answers then heres what i have for you. Cardioid is the pedal of a circle with respect to a fixed point on the circle. Relative phase response data, pdf exports, and trace storerecall to the gradient subwoofer array tool for designing cardioid lowfrequency systems. Administration of large networks could be a very timeconsuming work. It can be a challenge to wrap our heads around how we get the speakers to play leapfrog in the forward direction and demolition derby on the back side. So this program should represent a comfortable solution for calculating subnets in. Some of the comparison parameters include box volume, frequency curve, 3 decibel point and box resonance frequency. I added the word cardioid to the title to clarify a bit, but as far as the phasealigning process goes it is the exact process as would be done onaxis for cardioid subwoofers where the back sub is delayed to the front and polarity inverted.
New website merlijn van veen, home of the subwoofer array. Ks212c cardioid subwoofer front back15 db typical subwoofer energy dispersion most subwoofers radiate energy around the entire enclosure, leading. A cardioid is formed by a circle of the diameter a, which adjacently rolls around another circle of the same size. The ks212c subwoofer represents the worlds firstinclass singlebox active cardioid subwoofer solution for highly portable entertainment and installation applications. The end fire cardioid array made visible the end fire array is one of the most talked about, even if not the most often implemented of the cardioid subwoofer arrays. Calculations at a cardioid heartshaped curve, an epicycloid with one arc. Use the driver displacement calculator to determine the displacement for your driver. The s4 calculator provides twodimensional polar prediction at any frequency not just 1 3. A cardioid subwoofer or subwoofer array produces a heartshaped coverage pattern in which levels are louder to the front of it and lower behind it. Overview jbls vertec line array calculator ii software duplicates previous lac functionality with a similar look and feel, but now offers a more refined work tool that enables system designers and setup technicians to simulate a wide variety of vtx and vertec arrays. A cardioid microphone picks up sounds in front of it more effectively than it picks up sounds behind it. The s4 program is free and can be obtained by downloading here. The cardioid sub can produce increased level in the audience and reduced level at the microphone.
Calculators software downloads free download windows. The fixed point forms the cusp of the cardioid, and the circles diameter is the cardioid s diameter. In the posts on this kind of an array before this one i was mainly interested in getting as much cancelling on the stage side and as much level possible in the audience area. Hey with all the talk of rogs delta array and the general idea of cardioid sub arrays i thought it would be good to type up a quick tutorial on the basics of the theory of this technique and how to set it up in the real world, partly for all you good folks but partly for myself as well, as ive always found it a great test of your own knowledge if you can explain it to other people. You can use up to 12 speakers with omnidirectional, cardioid, super cardioid and figureeight speaker patterns. And why are they so important when choosing the right mic. Aligning cardioid subwoofers from the kick drum daniel. It gets it name from the graphical drawing of the sound sensitivity polar pattern in front of t. Cardioid, or heartshaped, refers to the shape of the coverage, or pickup, of a transducer. Mar 05, 2017 it is a microphone with a selective acoustical pattern that hears mostly from the front of the microphone some from the sides and none from the back. If theres no room for a end fired or a reverse end fired sub array or the budget only allows 3 subs a side and theres no room for a end fired line of 3 subs theres 1 array you can try.
In normal mode, the sub is phasecoherent with the tops when they are facing the same way. Dec 23, 2010 this feature is not available right now. A cardioid microphone exhibits an acoustic pickup pattern that, when graphed in two dimensions, resembles a cardioid any 2d plane containing the 3d straight line of the microphone body. When you add the second sub thats necessary for cardioid mode it does face the rear and it does go in cardiod mode. The s4 calculator provides twodimensional polar prediction at any frequency not just.
Jun 14, 2016 please refer to cardioid r1costhetafrom0to2pi. Qsc k cardioid dual 12 w powered subwoofer rk audio. To begin our discussion of the theory behind various directional subwoofer arrays, we list a number of. Mar 10, 2010 the cardioid sub can produce increased level in the audience and reduced level at the microphone. Communitys subwoofer steering simulation software s4 makes it easy and. The broadside array arc delay calculator from martin audio is designed. This spreadsheet is the swiss army knife for subwoofer configurations. Being music makers ourselves, we love geeking out on all things gear. A breakthrough in innovation and design, the 3,600 watt ks212c subwoofer uniquely provides all the benefits of cardioid deployment in a single, compact enclosure. The last end fired subwoofer calculator bodo felusch. For convenience well refer to cardioid subs throughout this article, but there are in fact a whole family of polar patterns available, sub cardioid, cardioid, supercardioid, hypercardioid, and bidirectional. For convenience well refer to cardioid subs throughout this article, but there are in fact a whole family of polar patterns available, subcardioid, cardioid, supercardioid, hypercardioid, and bidirectional. The csa method reverses the enclosure orientation and.
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