Power is the only factor of an amp that has any effect on SPL. ), and connect that to the 4-Ohm output of the amp. Most car audio speakers rest at a 4ohm load when connected to a single channel on an amplifier. Most of the time it will be on the side of the coil, probably in very fine print. They also produce less sound in comparison to the 2 ohm ones. Disagree. 400@4ohms is the same as 400@1ohm." For example; a subwoofer connected to an amp is an electrical circuit and can be measured in ohms. This is an important difference when using your amp to power multiple subwoofers, because you won't be able to bridge your multichannel, 4-ohm stable amp to power multiple subs that present less than a 4-ohm load. "if you put the exact same watts at 1 ohm and then at 4 ohms, yeah the 1 ohm will be waay louder, cause of less impedence." Where do you find the ohm of your coil? The lowest standard impedance is 4 Of course, if you had 2 of them, you could connect them in series, (watch the polarity! For example, our XTHUNDER1200.1 amplifier is rated for 1200 watts RMS @ 1 ohm. Instead, use a mono amplifier to power a 2-ohm load — two 4-ohm subwoofers, or 2, 2-ohm dual voice coil subwoofers, for example. But since the 4 ohm subs can be wired differently resulting in an effective total impedance of 1 ohm, you get the full 1000 watt power from your amp and match the rated power of your subs for full performance. Some of the more common ohms are 1.5, 1.6, 1.8, 2.1, 2.2, and 2.5 ohms. The most logical setup would be 2 dual 4 ohm subs to a 4 ohm load. I believe most, if not all of those amps will do the same power from 1-4 ohms (JL being 1.5-4 ohms), Now I'm not sure if these amps are a bad example (they may not have such effects, but I'm not 100%), yes they will do the same power, lets say 1000 watts @ 1 ohm, 2 ohm and 4 ohm. What do those numbers mean for you the vapor? See if you can get or borrow an Ohm meter, and check the D.C. resistance of the voice coil. Now for the sensitivity, i.e. 6 or 7 wraps using 30ga with a 5/64 id should get you right at 1.5 ohm with little to no lag while still being durable enough to hold it's shape and re-wick with micro coils. I personally use 28ga for lower 1 ohm builds and use 30ga for mid 1 ohm up to 2 or slightly over. Before making a distinction between 2 ohm, 4 ohm, and 1 ohm, it is crucial to first understand what exactly is an ohm and how it applies to car stereo receivers. In the simplest of terms, an ohm is the amount of resistance that an object or an instrument offers to the flow of electricity. 4 ohm subwoofers will have a higher electrical resistance, use way less energy and will, therefore, last longer than subwoofers with lower resistance. The amp will usually deliver it's rated power to the sub-woofer and you will hear sound. 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