Excellent video! Like the comment below, I was trying to use 1000hz, but that does not work, too low voltage. I used the 80hz, and set my crossovers to "full" for the test. I found the voltage, then set it up according to the math. Reminder to anyone using a software EQ, put the EQ on Flat or every frequency a few db's negative below flat... I would also suggest to find the EXACT point of clipping from your head unit (before it goes into the AudioControl)... Mine, for example, is clear at volume 33, then clips at volume 34. That's is "probably" 75% or so, but you can see how a single db can make the difference!

You can give your speakers more than 50 rms, you always want to go over the rms rating a little. No system runs at 100% efficiency, there's all kinds of factors that leads to wattage loss. If your speakers are rated for 50 rms and you match your amp to do 50 rms your speakers will only get a percentage of that. If your amp runs at 75% efficiency, your speaker is only gonna see about 33 rms, thats just one factor and will only do that if you play a continuous sine wave which we don't do. We listen to music, so that plays all different frequencies which will also drop your 33 rms down even more, lets say to 25 rms. Another factor is your voltage, does your voltage drop when system is turned up? 99% of the time it will, especially if your running other things like lights, heat/AC, wipers, etc at the same time. So if your amp is rated 50 watts rms at 14.4 volts and your voltage drops to 13 volts or lower, your gonna lose even more of that 25 rms, let's say only 5 rms is lost. Now your speakers are only seeing 20 rms, of coarse that's an exaggerated example but the point is no system runs 100% efficient so you always want to exceed your speakers rated power to make up for all those factors. Instead of getting a 50 rms amp, get a 75-100 rms amp and clamp it to see how much juice your speakers are getting in real time and adjust the gain to where the wattage is averaging 50 rms. To much power is safer than not enough power as long as your not clipping the signal, it will sound cleaner and last longer. When you don't have enough power people tend to crank it up real loud distorting the signal and end up blowing there speakers.

Thanks for watching the video!!!! Hope this helps you out!

Great vid, one of the clearest ones I've seen. My use case may be unique so i will ask; is the formula any different whe you are using a 4channel amp in bridge mode? I will be installing 2 amps for the added wattage and want to do my best to ensure only the needed power gets pushed to the speakers. Aslo, would it make sense to turn on the the enhancements to not give my kids or anyone the opportunity to blow the doors off my ride literally; because I have alreaded accounted for any spikes they would cause? TIA

I have 4 jbl speakers that run 60 rms and the 4 channel amp i got runs 125x4 2ohms 75 watts x4 4 ohms is this amp good for my speakers because mine dont match the same like yours did with the 50

so you multiply the wattage FIRST, then square root the answer. Thank you! so confusing, some people saying square root of wattage x 4.

Very simple and informative video. Can you indicate the 50 RMS that use in square root equation obtain from Amplifier value or speaker? Cause my Amplifier indicate (Manufacturer) 60 RMS x 4ohm Other hand my speaker 30 RMS @ 4ohm. Should use 60 or 30? Thank you.

Maybe be dumb but should you use the 80hz for all amps? Or are they different trying to set up my 800.4 db

You did not say what you set your multi meter to or did you say where you were putting your probes. Can you LMK what you did there? Thanks

Hi I'm been trying a few days trying this on my 4.1 infinity amp. I get 0 reading or 0.1/0.2 when i turn up gain. I have 2 cheap harbour freight DMM. 1 new 1 old. I tested on full/HPF/LPF on 50/60/80/1000hz. What am i doing wrong or buy a good DMM?

Question, why are there videos with people using a 1000hz 0db test tone to set a 4 channel?

The video thumbnail click-baited me. Lol

Is your multimeter set to ac voltage?

You have no business making these videos. You give false information. Not your fault. You just don't know what your talking about