A primary factor in choosing component car subwoofers is choosing the correct amplifier to power the system. While series wiring of multiple subs increases the total effective impedance, parallel wiring of multiple loads lowers the total effective impedance. 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 results show every possible wiring configuration for your setup. 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. 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. 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. 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. Questions, comments and requests regarding this software are welcomed and should be addressed to us in support@subbox.pro Use of materials (printing, copying) is allowed with reference to the source. From the formula above, we see that we can lower the total impedance of the two sub system if we wire in parallel. 10 inch Subwoofer … Please enter your email address below. 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. Subwoofer box calculator online. 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. 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. Next, you need to draw a box, on paper or in a program, it will take at least 20 minutes. Please fill out the information below to have one of our representatives contact you. Welcome to the CT Sounds Subwoofer Wiring Wizard. You will receive a link to reset your password. This amplifier can deliver 500 watts at 2 ohms, so each of the 3512s will get their full 250 watts of optimum power. 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. Calculate a speaker box volume, port length and other parameters without getting confused in formulas. The rating on the amp is 300W x 1 channel @ 4 ohms and 500W x 1 channel @ 2 ohms. 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. 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. 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. We can provide you with comprehensive Subwoofer Box Calculator for online creating a high performance subwoofer enclosure. 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. So we take the 4 ohm impedance and divide by two subs, which results in 2 ohms total 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. Build a ported box, sealed box for your low-frequency speaker. 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. In reverse, we may be able to change our wiring pattern to accomplish needed impedance totals to match the component combinations we desire. Many people don't realize that, unless you have virtually unlimited resources, there are going to be trade offs when designing a system.

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