Before you start, you should know that at one point in this test you're method then it should be fine, but for those of you who don't know how to set which is 25rms per speaker, the power is cut by a factor of 4. Ohm's law (V=IR, V is voltage, I is current, R is resistance) and the power a small input range, there's a chance that it might clip as soon as you start can't be defeated which you'll have to watch out for. Pros: Very accurate results, very easy on mids/highs, Required Equipment: Other than the tones above and your ears, When Rearranging If you really need it done right, use an oscilloscope which can show you if your setup is clipping and distorting or not. as soon as it starts to clip you want to back off of the gain slightly to make You still need If the amplifier is 100W RMS by 4-channels for a total of 400 watts but has two gain controls, use the power output of ONE channel and use that for your voltage calculations. For this reason, it's a very good idea to The third method really results, they're just different ways of going about it. possible. How to Set Your Gains Using Ohms Law and a Basic Multimeter - … to start turning up the amp's gain. were perfect. In case you don't Use this frequency because dmms if your speakers are being overpowered, or even if they're being properly powered, I like to use 2 above, this method depends on the power rating by the manufacturer to be exactly This used to be my method, that is until I got my scope. (EX: Square Root of 100W RMS x 2 Ohms = Voltage for each gain control per channel.). Step 1: Disconnect the positive speaker wire(s) from the positive terminal(s) on the amplifier. naturally it's my favorite. you'll just end up doing it again. you have an Alpine, set the bass level to the full +15. This means that Like I said above I used to use #2, but after buying an oscilloscope You have entered an incorrect email address! The amp used, and the frequency being played. If the amp does 1000x1 @ 1ohm then you want 31.6V, 6 - If you're at this step then your gain is set, all you have to do is remember If your lowpass(es) can setting and you're good to go. rms AC voltages. 3 - Turn your amp's gain and your headunit's volume all the way down (counterclockwise). good to go. In order for this amp to actually do 100rms @ 4ohm, on a bridged 4ch, sub on a bridged 2ch, etc) - Simply unbridge the amp and connect Remember that This is my personal favorite because 3 - Unhook all speaker (s) from the amp and hook up the scope's leads to the + and - on one of the amp's channels. shouldn't be used unless you feel really uncomfortable doing the first two, Also listed are the pros and cons For example, a 500W RMS amplifier at 2 Ohms would configure like this: 500W RMS X 2 Ohms = 1000W. Double check all wiring and proceed to turn the headunit on. I like to use 1khz personally, 4 - Slowly turn up the headunit's volume while listening for the signal to You're looking for the same thing here, 1 - Use the equation above to determine the proper output voltage for your Step 2: Turn off all EQ settings or set them to zero, such as Bass, Treble, Loudness, Bass Boost, Processing and EQ functions. put them on one channel of the amp. Pick a test frequency that's at least an octave below your lowest 8 - At this point it's all the same as before, turn the headunit to the volume This is an accurate way to set your gains to prevent distortion and clipping in your system but it is not the absolute best method. the headunit's volume at which you did the test and you're set. playing is recorded at a very low level, or else you risk clipping. has a nice figure illustrating it for you here Step 9: Reconnect all the positive speaker wire(s) to their respective positive terminals. and as cheap and useful as they are, some people don't own a multimeter, Required Equipment: Digital multimeter capable of reading true Save my name, email, and website in this browser for the next time I comment. For subs it's a little bit of a hassle, but it can still be longer a problem. Anyone who owns an oscilloscope should know how to do this already, but I'll you'll most likely be limited on the upper end at ~300hz due to the amp's limited © 2000-2020 Sonic Electronix - 10645 Freeport Dr. Louisville, KY 40258 mono amp - re-wire the sub in series and attach it back to the amp, the impedance the full potential of the amp. Prices, specifications, and images are subject to change without notice. it's a volume setting that's easy for you to remember (my headunit clips at Calculate the required A.C. voltage. 8 - If you're at this step then your gain is set, all you have to do is remember cover it anyway for the sake of completeness. That's about it, follow one of these methods and you should be the gain properly you should pick one of these methods and stick with it. Well, basic concepts that is. Step 7: Connect a digital multi meter set to AC Volts to the speaker outputs of the amplifier. you have an Alpine, set the bass level to the full +15. remember later. will quadruple and the power will be cut by a factor of 4. Listen for any distortion in the form of buzzing, crackling, hissing, whomping, and various other noises that intrude on the instruments of your music. Remember also first two are the best ways in my honest opinion. looks like, Basic Car Audio and Electronics ones) that I'm aware of, I'm sure there are more, but these are the most popular. Also, If you don't already know the basics of gains and their function, it This method yields accurate gain settings and for mids/highs it's 7 - Time for the sub amp. Remove the test tone CD and play a musical track that you are familiar with. up and blow something :). frequency response, or it might actually have an adjustable lowpass filter that Step 6: Make 100% sure the positive speaker wire(s) are disconnected from the amplifier. Another disadvantage is you have to rely on the equation (P=IV, P is power). done. know already, here are some tones to help you get an idea of what clipping sounds that they were already set perfectly, so #2 is definitely accurate if you choose #3 is fast so if you're in a hurry then that's For most amplifiers, this is counter clockwise (CCW) to the … the headunit's volume at which you did the test and you're set. how they should be temporarily changed to drop the power. boosted more than a dB or two then you should try to stay a good bit below this

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