A larger Ohm rating equals a greater load impedance. If you wire one subwoofer to one amplifier, your matching calculation is straight forward. Make a subwoofer enclosure plan. The results show every possible wiring configuration for your setup. So if you have two 4 ohms subs wired in parallel, the system would have an effective impedance of 4 ohms divided by 2 subs for a total impedance of 2 ohms  presented to the amp. Our website uses cookies to improve our site’s user-friendliness (and to measure where our visitors come from). So let's look at matching some subwoofer/amplifier systems…. For this calculator to work you’ll need to know the output impedance of your amp as well as the number of speakers used in your cabinet. It will attempt to help you get what you want from your audio system and your subwoofer in particular. Can he add another 3512 subwoofer? This page will touch on a few new topics (all of which are covered in detail on upcoming pages). Ideally, Bob want's 2 x 250 watts = 500 watts for the two subs. The amplifier is rated at 300 Watts RMS x 1 Channel at 4 Ohms or 500 Watts RMS x 1 Channel at 2 ohms. The negative of the last load is wired back to the negative of the source forming one large loop. Ideally, Bob want's 2 x 250 watts = 500 watts for the two subs. Questions, comments and requests regarding this software are welcomed and should be addressed to us in support@subbox.pro While series wiring of multiple subs increases the total effective impedance, parallel wiring of multiple loads lowers the total effective impedance. From the formula above, we see that we can lower the total impedance of the two sub system if we wire in parallel. The 2 ohm wiring would allow them to work with the amplifier and although the system would not get the full power out of the subwoofers, 800 watts, the system would function and deliver excellent SPL performance. Two subs on a 500 watts RMS amp will want about 250 watts RMS each. So we take the 4 ohm impedance and divide by two subs, which results in 2 ohms total impedance. Imagine how much time you will need to calculate the length of a port by its area and the net volume of a box, then calculate the occupied volume by the port, add it to the net internal volume of a box, and only after that, calculate the dimensions of a box, taking into account the material thickness. A primary factor in choosing component car subwoofers is choosing the correct amplifier to power the system. 8 inch Subwoofer Box | Ported | Pipe on the Right Panel. Calculate a speaker box volume, port length and other parameters without getting confused in formulas. For instance, some subwoofer/amplifier combinations will not allow full power to be produced safely such as a sub combination that results in a 1 ohm effective load for an amplifier rated at 2 ohms minimum. Cookies help us deliver our services. Our online calculator will make a subwoofer box plan, 3D model and other calculations in about 0.025 seconds - we think it's convincing. This means we are going to rock big time! Please enter your email address below. Without a box, due to the lack of the necessary damper, the speaker is very easy to pull out of the stroke, this is when the coil starts to come out of the magnetic gap, it is at this point that any slight distortion of the diffuser can lead to a coil's impact on the core (cylindrical magnetic core in the center of the coil), which leads to the detachment of the winding from the coil frame. Total Impedance = Sub I1 +Sub I2 + Sub I3 + …. Since parallel wiring lowers impedance, always double check to ensure your totals do not run into unsafe levels especially when bridging an amp to increase the rated power available. Of course there are exceptions, for example, as Free Air subwoofers, which are designed to work in an open volume, but the efficiency of these subwoofers is very small, it is recommended to install them only as a last resort. The 55 Series subs are dual voice coil so the wiring is going to be different than our previous example. Request Access to Use AtlasIED.com to Place Purchase Orders. You may occasionally need to compromise. In reverse, we may be able to change our wiring pattern to accomplish needed impedance totals to match the component combinations we desire. SUBWOOFER + INTERNAL AMPLIFIER + ENCLOSURE, CAN-AM MAVERICK AND COMMANDER AUDIO SOLUTIONS, SPEAKER CABLES, SELECTORS, AND VOLUME CONTROLS, MTX THUNDER500.1 500W RMS mono block class D amplifier. But if you are wiring multiple subwoofers to a single amplifier, then calculating the total effective impedance of the system is a necessary step for safety and reliability as well as performance. Amps can generally be safely wired at 4 or 2 ohms and some even at 1 ohm depending on their design. Since multiple subwoofers wired in combination result in different effective impedance ratings as a group total, we must calculate this total based on our wiring technique. Then, fill in the input fields of either calculator depending on if you want to know the required power for a target SPL (use the first calculator), or if you want to know how loud a given amplifier will be (use the second calculator). Everyone understands that the box is an indispensable part for the proper operation of the low-frequency speaker, which is designed to work in a certain volume, without it, the subwoofer speaker will simply chase the air, while the efficiency will decrease several tens of times. By using our services, you agree to our use of cookies. Build a ported box, sealed box for your low-frequency speaker. Speaker wiring is a simple process that often gets complicated when trying to visualize the wiring configuration. Please complete this form and we will have one of our audio experts get in touch with you. Can he do it with this amp? Using the chart in Step 3, for two subwoofers, a final 2-ohm load can be achieved with either two SVC 4-ohm subs or two DVC 2-ohm subs. Easy and convenient build your box. This amplifier can deliver 500 watts at 2 ohms, so each of the 3512s will get their full 250 watts of optimum power. Then, select the number of subwoofers to power, and click “Find an Amplifier.” The Amplifier Finder Tool was designed and tested by Sonic Electronix to provide accurate and consistent results. Calculate a speaker box volume, port length and other parameters without getting confused in formulas. Bob has a great single sub system in his Chevy, but wants to upgrade to two subwoofers. Car Audio Subwoofer Enclosures. Calculation with line to neutral voltage The phase current I in amps (A) is equal to the power P in watts (W), divided by 3 times the power factor PF times the line to neutral RMS voltage VL-N in volts (V): I(A) = P(W) / (3 × PF × VL-N(V)) The power factor of resistive impedance load is equal to 1. He currently has an MTX THUNDER500.1 500W RMS mono block class D amplifier with one MTX 3512-04 12" 250W RMS 4 Ohm Subwoofer. Since it has been wired to a single 4-ohm sub, the amp can deliver 250 watts with a properly set gain to match the sub power rating perfectly. All rights reserved. Start by selecting the subwoofer manufacturer and model from the dropdown menus. By continuing to use our website, you agree to our use of cookies. This website provides all information for free viewing by an unlimited number of persons. What if Bob wanted to use that same amplifier with a couple new 55 Series subs which have a dual voice coil design and can handle 400W RMS. If you are wanting to know how to wire your subs look no further than our wire diagram. In series wiring, you add the impedances of the voice coils, so wiring two 4 ohm voice coil subs would result in 8 ohms for the system total as presented to the amplifier. Please fill out the information below to have one of our representatives contact you. Subwoofer box design online software. With subwoofers rated at equal impedances, the system impedance is equal to the impedance of one sub voice coil divided by the number of subs. So you’ll look for subs each rated for 250 watts RMS or more. We can provide you with comprehensive Subwoofer Box Calculator for online creating a high performance subwoofer enclosure. The rating on the amp is 300W x 1 channel @ 4 ohms and 500W x 1 channel @ 2 ohms. If you want to visualize the resulting drawing in 3D, using SketchUp for example, you will also need at least 15 minutes, given that you have experience with it. 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