great thing about a multiple-speaker hookup is that once you master only two basic wiring procedures – "series" and "parallel" – the world is yours to conquer. both subwoofers are rated at 4 ohms, the second one (pb) would also receive 100 watts. back to the hypothetical subwoofer installation outlined above, we know that the amplifier in question is rated to deliver 100 watts x 2 into 4 ohms. additionally, if you have an idea for a wiring configuration that you do not see here, chances are you should re-think its implementation (in other words, don’t do it). (4 ohms is established by plugging the 8-ohm rating of each speaker into equation 4). youre wiring more than two speakers in series, you simply continue alternating the negative and positive wires between speakers. if he chose two 5512-22 models, they could be wired at either 2 ohms or 0.

the 55 series subs are dual voice coil so the wiring is going to be different than our previous example. next, redraw the circuit as a single imaginary tweeter with an equivalent-load impedance of 4 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. 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. can find wiring diagrams in the kicker u app for ios or android. calculate the new amplifiers power output into 2 ohms, refer to equation 2. following diagrams are the most popular wiring configurations when using dual voice coil woofers.

the calculation goes as follows:Pn = po x (zn / zt)pn = 50 x (4 / 8)pa = 50 x 0. amps can generally be safely wired at 4 or 2 ohms and some even at 1 ohm depending on their design. series wiring of multiple subs increases the total effective impedance, parallel wiring of multiple loads lowers the total effective impedance. this amplifier can deliver 500 watts at 2 ohms, so each of the 3512s will get their full 250 watts of optimum power. fear not, though, for we have compiled wiring diagrams of several configurations for single voice coil (svc) drivers. in the appropriate numbers, the calculation is worked through as follows:Po = 100 x (4 / 8)po = 100 x 0. 200 for po, 2 for zt, and 4 for zn, the equation works through as follows:Pa = 200 x (2 / 4)pa = 200 x 0.

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. 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. now, you should have a pretty good feel for the fundamentals of multi-speaker wiring (or a bad head- ache). speaking, series wiring is where the positive terminal of the source is wired to the positive of the first load, the negative of the first load is wired to the positive of the second load, and so on. math for zcd is identical, since both speakers are rated at 4 ohms, so zab and zcd each receive 50 watts of power. the bottom line: the amplifier will see a total equivalent-load impedance (zt) of 4 ohms at 10,000 hz. the drawing should look like figure 3c, with the label "4 ohms" in place of zt.

500w rms mono block class d amplifier with one mtx 3512-04 12" 250w rms 4 ohm subwoofer. 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 only practical option, therefore, is to combine the two wiring methods in accordance with figure 3a. that we know each amplifier channel will deliver 50 watts into an 8-ohm load, we can figure out how much power will be applied to one of the subwoofers – pa – by solving equation 3, in which zn stands for the rated impedance of the speaker:Equation 3: power applied to each driverpa = po x (zn / zt). finally, to find a single, total equivalent-load impedance for the "combined" speakers zab and zcd, substitute new variables into equation 4 [zt = (za x zb) / (za + zb) becomes zt = (zab x zcd) / (zab + zcd)]. 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. you can see, by upgrading to a 2-ohm-stable amplifier and wiring the same four 15-inch woofers in parallel – two per channel – power output jumps fourfold – from 50 watts x 2 to 200 watts x 2.

to figure out how much power each real speaker will receive, work through equation 3, substituting 50 for po (the amplifiers output power into zab and zcd), 4 for zn (the speakers rated impedance), and 8 for zt (the equivalent impedance of zab and zcd). best way to understand the electrical implications of this wiring scheme is to conceptualize it in three stages, as represented by figures 3a, 3b, and 3c. 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 an amp is rated to deliver 150 watts x 2 into 2 ohms but does so for only 5 minutes before its thermal-protection circuit kicks in, it wont be of much use. wiring has the opposite effect of series wiring – load impedance drops when speakers are wired in this fashion. the amplifier youve reserved for this task delivers 100 watts x 2 into 4 ohms and is capable of driving a minimum load impedance of 4 ohms; the subs are rated at 4 ohms apiece. a 2 ohm load, while some can go as low as 1/2 ohms.