How To Properly Set Amp Gains
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- เผยแพร่เมื่อ 28 ม.ค. 2023
- Get your scope here: amzn.to/3Y393le
Setting your gains properly is an extremely important part of the install process. To ensure your equipment lives a good life, set your gains and you'll never have to worry!
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Oh man. Could ya give us a vid on how to use and set up the o scope ?
Dude I concur. I have a oscope in front of me now and shit. I'm watching this just to see the setting since it's the same brand lol
😂 I’m here wondering the same, quite a few of these vids out on using a cheap little Amazon o scope to set amp gains…..
Yet not ONE of them tells us wtf we’re using or not even a mention of why the settings are where they are. 😂
PLEASE FOR THE LOVE OF GOD! Make the video!
If you don’t I’m going to as soon as I figure the stuff out! 😅
th-cam.com/video/nKQqcQ5q34I/w-d-xo.htmlsi=t5ypDaktXGUBiGvn
Yes please make a video on how to use the scope. Please sir!
I pause the video and copy the settings on his oscilloscope, since I had kinda the same one but different brand.
You should check the lower half wave for clipping as well. Sometimes the top and bottom half cycles clip at different amplitudes.
Love the video how would you do this for your mid bass speakers that run at 80hz
IDK if there is a follow-up video to this one (my first vid of yours) but I would like to a couple more things... this is just setting the amp gain level with a HU-Amp setup w/ no bass boost [active]. You probably address it later like in your DSP/tuning video but reset the gains on your amps finally AFTER all DSP units (incl. "bass restoration" units) are installed & tuned also... of course with the bass boost knob turned all the way up. That all matters especially if others (especially your "kids") might be driving your vehicle at some point. (for those who don't know) If you set your amp's gain with the bass boost active and set to the dial's midway point, when someone else uses your vehicle and they crank the bass knob (line signal knob) all the way, it COULD blow a sub. I'm a fan of overpowering my subs & other components within reason but have used a 2k amp on a 4watt RMS sub... just have to "gain it down" but that's a whole other video & topic. Sorry, I get excited talking about car audio... for 30 years now, lol. GREAT video, going to check out the channel now :D
I'm in the same exact journey. Car audio is a while new world I discovered. I was thinking I could increase my source input in my unit, because I too couldn't clip my low outputs.
Nice work
Ayyyyy Oaks garage hat =immediate sub 🤙🏼
Great video, but could you explain to us how to set up the oscilloscope so that we can get the size of the sine waves to match what you have here in the video I bought a brand new one from Amazon and I’m having a really difficult time getting the wave high enough where I can see when it clips or notinitial set up is what I’m asking for help. How did you prepare it to do this test and what settings do you have it at?
Thanks
I have the same oscilloscope. What setting do I put it on and where do I plug it in?
so many people need to know this!
What did you connect the oscilloscope to ? RCA's speaker wire ?
How many volts is your hu? 4v im assuming? I got the same jp23 v1.5 and it starts at 6v and i always had mine around 9oclock position which i believe to be 4v but u had yours all the way to 12oclock. What was your ssf set to?
Would this apply to coaxials in having a hard time finding a video tuning them they have a speaker and tweeter so I’m not sure if I’m gonna be running hpf for tweeters or LPf but I know that will most likely blow it
Why do you have the offset offset? You need it Center that way you can tell if it's equal voltage on both sides
What HU do you have?
Where do you connect the leads to?
Help please im new to car audio and could use some advice on certain settings. 3:56 subwoofer settings(mines a bit different). My pioneer headunit has a section on the menu called SUB W CTRL and in that menu it has cutoff frequency 50hz to 200hz with increments in-between
And it has output level -24 to +6
As well as a 3rd setting which is
Slope level -6 to - 12.
I currently have cutoff set to 200hz(mainly so I can hear more out of the sub so it seems louder)
Amp crossover is also set to 200hz(its the max setting on amp crossover)
The output level I have set to 0(can I go up on that and my subs be louder assuming I check for distortion from head unit on rca cables to make sure I'm not sending clipped signal to amp? And i guess id also have to reset gain with o-scope)
And the Slope thing I've got not clue about so i left it at -6
Now what if the speakers handle less than the amp would I then turn gain down a little
I just saw that if you do this without load ( sub ) you will clip as soon you connect a sub and go full tilt.
So im gonna try adjust gain with sub in :)
Why is mine not showing any voltage or other specs on the screen I don't see any Vmax Vmin Vave Vrms Vpp Fre nothing showing 😢 is mine broke
How do I get ahold you?
how could you do this for a 4 channel? could I have the speakers on full range and test it at 40hz as well? or is there a better way for mid and high
1000hz for mids
So when you are checking the head unit where is the scope hooked up at. The sub out or the input?
The sub output but without being wired to the subs
Did you find the clipping point with 0db or -5db? Also, when setting gains did you use 0db or -5db etc ?
i always try to tune with 0db given that its rare to find any audio track recorded in a -db format. better to tune safe than tune stupid.
@@kevinstafford6238 you leaving some power out tho. I always find clipping point with 0db and then use -5db for bass and voice amp. No song is recorded at 0db
I really like those amps
You have a link to another unit, that one is unavailable.
Should I set cross over b4 or after setting up the gains ?
0 xover to set Gain. il low pass filter set to the max and hiGh pass filter set to the minimum
digging the zapco dsp... but why is the video stuck at 360p?
HD is still processing 😩
I have the same scope, I got it Amazon lightning deal couple days ago 28$ free one day shipping. But running the scope without any subs hooked up wouldn't that change from 4ohms to 1ohms once plugged in?
Don’t unhook your subs I bought the same one myself it just came today I’ve got mine wired at 2 ohms right now and I’m gonna tune it hooked up. Gonna do the rcas first to find out my max volume on the HU and then plug those in and move to the speaker outs on the amp. Just make sure your bass knob is all the way up and the gain all the way down to start and just slowly work your way up until the wave flattens or goes bonkers like his did.
@@durwoodthegiant4421 Did it hooked up yesterday @ 50hz 0db. Mine was clipping at 59v installed a second battery today now it moved up to 74v till clip. Do you happen to know would I use vmax or vrms + amps to find out my watts?
Thank for the video, I have set my amp gain using Multi meter, 300 watt speakers, 300w*4ohm, square root. 34.6v, when i turn my volume up the amp cuts out. Is this an issue with gain setting ? Goes into protect mode. Cheers from Australia.
Yes, you're probably sending the amp into protection mode. A 30 dollar O scope will save you a ton of headache. Plus you want to make sure you have the correct voltage required.
@@randallclark2407 Thank You for replying, I did buy a O scope and tried setting with that. I was better, but still cuts out at high volume. Maybe hitting protection mode as you suggested. Cheers from Australia.
hi i need help my amp says LOW PASS FILTER 50-250 is this a good or bad amp? and can it hit below 50hz? this is a 4000 watt planet audio? some amps says 20hz or 30hz LPF ... please explain detailed, i guess what im really asking is can this amp hit 30hz or 35hz ?
You completely misunderstand what LPF is for. It is for your main speakers. No speakers in a car door or the dash can play below 40Hz, that's why the low limit is 50Hz on it, and the rule of thumb is to take the lowest hertz your speakers can play and double it, then set that number as your LPF.
Good info, but should have gone into how to connect the scope to the amps too
Unplug the RCAs at the amp and connect the scope to the RCAs that input the scope. Ground lead on the shield and positive to the center pin. Make sure they're not clipping - which they weren't at full volume. Then reconnect the RCAs, disconnect the speaker wires and connect the scope to them for amp gains.
You connect the scope to the amplifier INPUTs. This will show when the pre-amplification of the head unit maxes out a 0dB Signal. Note where that is on your headunit. Keep the head unit playing that 0dB 55Hz signal at maximum.
Then put the oscilloscope away. You’re done with it. Pull out a multimeter, turn it to V~60.
Put the +/- leads on the +/- terminals of the amp output channel.
Turn the gain until you reach the voltage that equals the RMS-Max of your speaker.
That voltage value is:
Voltage = [Square Root of: RMS-Max x Resistance of speaker]
Square Root of 100W @ 4 Ohms = 20V
Turn the gain knob until it hits 20V. Feel free to go a tad over (21V) if you find it hard to get exactly 20V to stick. Most music is mastered at -6dB, so you have lots of wiggle room to go higher since the signal output will be suppressed in real-world application.
@@pitspeedtvmost helpful comment I’ve ever read
@@pitspeedtvthanks homie
Question should you set amp gain with 40hz or or -5 db 40hz test tone?
check all tones 20 to 100hz...not just 40hz
40hz -10 db for subwoofers 1khz -5db for door speakers.40hz 0 db is where u find your clipping point this is the first step then u set your gains remember all settings at 0 or flat ! Keep subwoofer level and bass boost off!!
I used this oscilloscope last night and could not get anything to clip. It also would not work on the bridged channel of my 2,400 w or my 5000 w mono amp. Am I doing something wrong? What is the possibility that the gains would be able to go all the way up?
you should just change the voltage to 20v instead of 10v, also 5ms helps
I thought most kenwood decks wont give full rca volts with sub level at 0 , most say max it and then its higher voltage cleaner signal less gain needed 🤔
You aren’t measure signal clipping. You are measuring the voltage drop of the Headunits Pre-amps.
The signal is set at 0dB (in the test tone)… the signal won’t ever clip.
The headunits go higher (and clip) because they are tuned to output at -6dB. Your headunits are therefore ill prepared to supply enough current to output the 0dB signal. So the voltage drops and the sine wave distorts as a result. You are simply finding the 0dB level on the headunit, so that you can output a clean 0dB signal to the amp. Once you have established that, you put your o-scope away. Now its just a matter of matching your max signal output to your max amplifier output as governed by your load (speaker).
You put a multimeter on the amp output and turn the gain knob until it reaches the target voltage.
Target Voltage = [square root of: MAX-RMS x Resistance]
100W @ 4 ohms = 20V
100W @ 8Ohms = 28.28V
This numbskull was measuring and calibrating based on his in-line capacitor Max-RMS ROFL. Don’t take his advice.
I got a problem. I'm using the same cheap scope a lot of guys here on TH-cam are using and my wave doesn't look anything like I see in the videos. I got it set to 20v and I think 5ms but the wave is not constant and uniform..I dunno whats wrong
I found my amp produces a 240khz sine wave for some reason, I couldn’t use ‘auto’ and had to set manually to find the 40hz wave - and it wasn’t clean since the higher frequency wave was added to it but eventually I was able to get to the point where I could see the wave, the clipping was fuzzy at top so I just set the gain until it was the same fuzziness as the rest of the wave. Just look up how to use an oscilloscope
How did you play the test tone without it playing through your door speakers
sub amp and door speaker amps had their outputs empty. you of course cant really do that on a system where you dont have an aftermarket amplifier to your door speakers like myself
Can you just use Pink Noise?
And where is the oscilloscope connected. You do realize that once you connect speakers whatever you thought was not clipping doesn't count anymore because now it has a reactive load right
👍
Looks like you could have turned the subwoofer amp gain up a bit more.
If my box is made for 43 hz is that the tone i use
No. Don't base the tone off your box, just use the 40 regardless since it's within the "bass" frequency range.
Thank you for saying that you used 40 for sub amp, then 1k for the non sub amp.
If the amp shows youre clipping, why bother with the o scope? Increase gain until the clip light comes on and then back down a smidge.
He's showing how to use the o scope, for people with amps that don't have a clipping indicator.
Without load !?
You must test clipping with load. Inductive or resistive for actual response.
Smd DD-1
That oscilloscope says anything below 45hz will not be accurate 😊
Dude you sound exactly like Christopher pine, the guy that plays Captain Kirk in the new Star Trek movies 😂 I mean you sound exactly like him. Good video by the way, I have the same o scope. Had one of my setting wrong and couldn't get the sine wave to stop jumping around until I saw the settings on yours.
This isn't how to set gains. If you want to properly set your gains you need to account for your entire system.. you would start by testing your head unit itself for clipping first and play several different frequency test toned such as 40 Hz, 80Hz, 150Hz, 400Hz, 800,Hz and 1 KHz. You look for clipping from the head unit at all if those frequencies and set your volume for whatever volume that is under the lowest clipped signal. Just because you may not be clipping at all at 40 Hz at full volume doesn't mean your not clipping at 400 Hz at 3/4 volume.. then once your head unit is properly tested then you can go to settings your gains at the amplifier. Otherwise you are just making sure the amplifier itself isn't clipping but that does not good if the amplifier is amplifying an already clipped signal