The rating on the amp is 300W x 1 channel @ 4 ohms and 500W x 1 channel @ 2 ohms. But if your sub has a dual voice coil (DVC), or you are wiring multiple subwoofers to one amplifier, then understanding the wiring alternatives offers insight into how best to connect them to maximize performance. Ideally, Bob want's 2 x 250 watts = 500 watts for the two subs. Bob has a great single sub system in his Chevy, but wants to upgrade to two subwoofers. 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. Use of materials (printing, copying) is allowed with reference to the source. You will receive a link to reset your password. In reverse, we may be able to change our wiring pattern to accomplish needed impedance totals to match the component combinations we desire. 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. Please complete this form and we will have one of our audio experts get in touch with you. We can provide you with comprehensive Subwoofer Box Calculator for online creating a high performance subwoofer enclosure. 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. A primary factor in choosing component car subwoofers is choosing the correct amplifier to power the system. Amps can generally be safely wired at 4 or 2 ohms and some even at 1 ohm depending on their design. 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. While series wiring of multiple subs increases the total effective impedance, parallel wiring of multiple loads lowers the total effective impedance. Generally speaking, parallel wiring is where the positive terminals of the source and all loads are wired from one to the next, and the same with the negative terminals forming two loops. Subwoofer box design online software. If you have an amplifier wired to a single-voice-coil (SVC) subwoofer, there is only one wiring method, so the SVC impedance is what the amplifier must match. 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. The amplifier is rated at 300 Watts RMS x 1 Channel at 4 Ohms or 500 Watts RMS x 1 Channel at 2 ohms. Make a subwoofer enclosure plan. 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. From the formula above, we see that we can lower the total impedance of the two sub system if we wire in parallel. 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. Our online calculator will make a subwoofer box plan, 3D model and other calculations in about 0.025 seconds - we think it's convincing. 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. 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. 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. Request Access to Use AtlasIED.com to Place Purchase Orders. Many people don't realize that, unless you have virtually unlimited resources, there are going to be trade offs when designing a system. Can he do it with this amp? Questions, comments and requests regarding this software are welcomed and should be addressed to us in [email protected] A higher impedance load will result in less amplifier output for that impedance, for example an amplifier will output more power at 2 ohms than at 4 ohms. 10 inch Subwoofer … Car Audio Subwoofer Enclosures. Two subs on a 500 watts RMS amp will want about 250 watts RMS each. If you wire one subwoofer to one amplifier, your matching calculation is straight forward. The negative of the last load is wired back to the negative of the source forming one large loop. Instead of burning up your amp, you may be able to wire the combination to result in a total impedance over the 2 ohms so that while the amp will not deliver the full power rating of the subwoofer (and your SPL will be lower), at least the amp will operate safely and reliably. If he chose two 5512-22 models, they could be wired at either 2 ohms or 0.5 ohm. So we take the 4 ohm impedance and divide by two subs, which results in 2 ohms total impedance. If Bob were to use two 5512-44 subwoofers they could be wired at either 4 ohms or 1 ohm, which would not be enough power at 4 ohms and at 1 ohm would cause damage to the amplifier. 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. Build a ported box, sealed box for your low-frequency speaker. 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. We can provide you with comprehensive Subwoofer Box Calculator for online creating a high performance subwoofer enclosure. So let's look at matching some subwoofer/amplifier systems…. The goal is to deliver as close to rated power to each sub as possible with a given amplifier by wiring the system in a manner that minimizes the effective impedance without exceeding the power rating of the subwoofers. Can he add another 3512 subwoofer? Build a ported box, sealed box for your low-frequency speaker. The results show every possible wiring configuration for your setup. Calculate a speaker box volume, port length and other parameters without getting confused in formulas. Speaker wiring is a simple process that often gets complicated when trying to visualize the wiring configuration. 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. Calculate a speaker box volume, port length and other parameters without getting confused in formulas. 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. 8 inch Subwoofer Box | Ported | Pipe on the Right Panel. Cookies help us deliver our services. 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. A larger Ohm rating equals a greater load impedance. The 55 Series subs are dual voice coil so the wiring is going to be different than our previous example. 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. Start by selecting the subwoofer manufacturer and model from the dropdown menus. Our website uses cookies to improve our site’s user-friendliness (and to measure where our visitors come from). 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. Ideally, Bob want's 2 x 250 watts = 500 watts for the two subs. 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. This amplifier can deliver 500 watts at 2 ohms, so each of the 3512s will get their full 250 watts of optimum power. You may occasionally need to compromise. The amplifier is rated at 300 Watts RMS x 1 Channel at 4 Ohms or 500 Watts RMS x 1 Channel at 2 ohms. Welcome to the CT Sounds Subwoofer Wiring Wizard. If you are wanting to know how to wire your subs look no further than our wire diagram. 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. 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