For a pair of 4-ohm woofers wired in parallel, the amp would “see” an 8-ohm load. Series wiring results in the sum of each voice coil impedance being added. The chart below shows you the net load for common subwoofer options.Ī less common configuration is to use low-impedance drivers and wire the subwoofers in series. In both of the above scenarios, the load the amp “sees” is half of the impedance of one woofer. Just as with the image above, this shows two SVC subwoofers wired in parallel to an amplifier with dual output terminals. Having two sets of terminals can help keep the wiring neat and tidy in installations like this. The two positive terminals are wired together inside the amp, so are the negative terminals. If you have an amplifier like the Rockford Fosgate T1500-1bdCP that we’ve used in the drawings that include a pair of terminals, you can wire one sub to each terminal. One of the most popular subwoofer wiring configurations: two SVC woofers wired in parallel. In this case, two 4-ohm subwoofers present the amplifier with a net 2-ohm load. Two identical loads wired in parallel present a single load that is half of the single-load impedance. The simplest would be two 4-ohm single-voice-coil subwoofers wired in parallel. Let’s start by looking at wiring pairs of subwoofers to an amplifier. The higher impedance will improve the amplifier’s efficiency, allowing you to deliver more power to your subwoofers with less draw on your electrical system. We highly recommend wiring these amplifiers to 2 ohms. It produces 600 watts into a 4-ohm load and 1,000 watts when connected to a 2-or 1-ohm configuration. The same goes for the Hertz Mille Power 1. For example, the Rockford Fosgate T1500-1bdCP is rated to produce 1,000 watts when connected to a 4-ohm load, then 1,500 watts when wired to a 2- or 1-ohm load. Here’s a small aside about amplifiers: Many subwoofer amps don’t make more power into lower impedances yet are still designed and listed as capable of running these loads. If you’ve purchased this amp, it only makes sense to present it with a 1-ohm load so that you get the most power available for your investment. If we look at an amp like the ARC Audio X2-1100.1, it’s rated to produce 350 watts into a 4-ohm load, 600 watts when connected to a 2-ohm load and 1,100 watts when the subwoofers are wired to present a 1-ohm load. You see, most subwoofer amplifiers produce more power as the load impedance drops. The goal of the options is to present the amplifier with a net impedance that allows it to make the best use of the available power. The voice coils of a single dual-voice-coil woofer can also be wired in series or parallel. When it comes to wiring subwoofers to an amplifier, your installer has a few wiring options: parallel, series and series-parallel. Nevertheless, there are a lot of options available. If we think long and hard, we seem to recall hearing about a quad 0.7-ohm coil competition-level subwoofer. When you get into some competition-level subwoofer products, you may see some dual 1-ohm coil configurations. Audiotec-Fischer has some quad 3-ohm-coil woofers designed to extract maximum power from its line of non-bridgeable amplifiers. The JL Audio W7AE drivers have a single 3-ohm coil, so three drivers can be wired together to present a 1-ohm load to an amp. In subwoofers available from professional mobile enhancement retailers, you’ll typically see either single 2-ohm or single 4-ohm drivers and dual 2-ohm or dual 4-ohm offerings. There are benefits in terms of installation flexibility, but the number of connections to the voice coil doesn’t improve the driver’s performance or sound quality. The only benefit of a DVC sub is that the coils can be wired in series, in parallel, or each can be fed directly to an amplifier channel. We’ll be clear: A single voice coil subwoofer isn’t “better” than a dual voice coil sub, or vice versa. In essence, they exist to provide the Product Specialist designing your car audio system with different wiring options so that they can maximize the performance of your subwoofer amplifier. We’ve talked about single- and dual-voice coil designs in the past. Subwoofer wiring configuration is crucial information if you’re shopping for an amplifier to mate to an existing set of subwoofers, or vice-versa. Clearly, this is a topic that consumers struggle to understand. We saw the same question come up time after time: “I have two dual 2-ohm voice coil subs how do I show the amp a 1-ohm load to make max power?” It wasn’t just once or twice that this question was asked – we saw it and versions of it at least a dozen times in less than an hour of browsing. A few weeks ago, we were browsing a few car audio related Facebook groups and Reddit subreddits.
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