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Old 11-16-2012, 10:52 AM
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Default How to REALLY clamp an amp.....WATCH!!

Alright guys. Some of you may think you are clamping your amp properly. But are you really getting accurate numbers?! Watch this video and it will explain in some detail how to properly calculate RMS output from your amplifier...
Measuring amplifier power via clamping - YouTube
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I think it's probably because that sub is not moving enough to allow it to cool.. Id turn the gain up a bit so it moves more for cooling reasons.. That's why it's hard on subs to be underpowered..
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Old 11-16-2012, 10:59 AM
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Nice. I got an Amp Medics AMD-1, makes my life easier.
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Old 11-16-2012, 11:06 AM
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I think you mean the Vital Power AMD-1. Steve is just the mastermind behind it...

But this goes to show the variables that exist when clamping an amp. Heck just the use of a non True RMS meter can mean the difference of a few hundred watts. And I see a lot of people using non RMS meters.
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I think it's probably because that sub is not moving enough to allow it to cool.. Id turn the gain up a bit so it moves more for cooling reasons.. That's why it's hard on subs to be underpowered..

Last edited by audioarsonal; 11-16-2012 at 11:08 AM.
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Old 11-16-2012, 11:11 AM
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Originally Posted by audioarsonal View Post
I think you mean the Vital Power AMD-1. Steve is just the mastermind behind it...

But this goes to show the variables that exist when clamping an amp. Heck just the use of a non True RMS meter can mean the difference of a few hundred watts. And I see a lot of people using non RMS meters.
Yeah, same thing, lol. Not very many people know Vital Power compared to Amp Medics, so I just go with that.

Certainly. I thought about buying all the nice meters and doing that stuff, but I just kind of decided the AMD-1 saved me a lot of headache of "is this the right meter?" "what's the amperage limit on this?" "is this one accurate?" and was about the same price in the end (if you went the proper route with Fluke meters).
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Old 11-16-2012, 11:15 AM
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The AMD is nice don't get me wrong. But I use my meters for much more then just audio testing/setup. So the benefits of having individual meters is a plus for me. I own 2 flukes, 1 craftsman, 1 tenma clamp meter and 1 tenma scope. With all of these I can do just about anything related to electrical troubleshooting.
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I think it's probably because that sub is not moving enough to allow it to cool.. Id turn the gain up a bit so it moves more for cooling reasons.. That's why it's hard on subs to be underpowered..
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Old 11-16-2012, 11:16 AM
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Yep. I have two multi-meters (cheap), not much use for clamp meters outside of this for me.
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Old 11-16-2012, 11:20 AM
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Yep. I have two multi-meters (cheap), not much use for clamp meters outside of this for me.
I here ya. That's how most people feel as well. Why should I spend $200 an this meter when I can get the Harbor freight one for $10! Don't they do the same thing...LOL

It just goes to show how inflated some numbers can be if you don't know what your doing or don't have the right equipment.
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Old 11-16-2012, 11:29 AM
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While I agree that is the most correct way to do it. I feel that it is a lost cause because unless you are an electrical tech you won't have an oscope with two channels or a shunt. And also most people won't realize why your numbers are lower and they will dismiss your results lol. I mean if everybody does it "wrong" then at least it is somewhat accurate (because everyone is clamping the same) even though inherently wrong.
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4 15s + Flat Wall + 10k = Loud

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Old 11-16-2012, 11:36 AM
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Originally Posted by SINTORMAN View Post
While I agree that is the most correct way to do it. I feel that it is a lost cause because unless you are an electrical tech you won't have an oscope with two channels or a shunt. And also most people won't realize why your numbers are lower and they will dismiss your results lol. I mean if everybody does it "wrong" then at least it is somewhat accurate (because everyone is clamping the same) even though inherently wrong.
That is the problem NOT every is doing it wrong. And just like you said the ones who do try and tell the ones, who actually have the proper equipment, that they are wrong.
If everyone does it wrong then NO its not somewhat accurate. Its over inflated. As you can see in the video by as much as 100%.
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Old 11-16-2012, 11:39 AM
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That is the problem NOT every is doing it wrong. And just like you said the ones who do try and tell the ones, who actually have the proper equipment, that they are wrong.
If everyone does it wrong then NO its not somewhat accurate. Its over inflated. As you can see in the video by as much as 100%.
I would be willing to bet The majority of clamps in our general clamp thread are done wrong.
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4 15s + Flat Wall + 10k = Loud

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