n8ball2013 Posted September 2, 2012 Report Share Posted September 2, 2012 me too. i cant wait to see someones response to that THERE IS NO BUILD LOG! 1998 Chevy Silverado ext cab Alpine CDA-9887 4 Team Fi 15s 2 Ampere Audio TFE 8.0 2 Ampere Audio 150.4 3 Digital Designs CS6.5 component sets Dual Mechman 370XP Elite alternators inbound! 8 XS Power d3400 6 XS power d680 Second Skin Stinger Tsunami Wiring Sky High A Real Voltmeter not a piece of shit stinger. Link to comment Share on other sites More sharing options...
Kyblack76 Posted September 2, 2012 Report Share Posted September 2, 2012 Wurd,.. the comment of "i know my rise" I started to type,... then ..stopped,.. jumped on FB,... then,.....stopped,... ... well,then, i just turned my computer off........ I hope its a great.,, and learning discussion,.... but,.. i have a bad feeling.... SMD SUPER SELLER The Burban Build Blazer Build sold Acura trunk build sold Link to comment Share on other sites More sharing options...
meade916 Posted September 2, 2012 Report Share Posted September 2, 2012 Interesting piece. Here's the major problem I see, the misapplication of Ohms law. Volts X Amps = Watts ONLY works for DC circuits, or where the load is purely resistive (a non inductive resistor). This is not an opinion, this is fact. An amplifier's output is not DC, so clamping, or doing what this piece does (measuring the voltage and current to the speaker and multiplying) is incorrect and inaccurate and only applies to DC circuits or AC circuits with purely resistive loads. A simplified formula for trying to measure power in an AC circuit would be Volts X Amps X Power Factor (phase angle) = Watts. If you don't know the phase angle, your measurement is pretty meaningless. The Amp Dyno uses precision non inductive resistors to do it's calculations so the power factor is always 1.00, and thus can be eliminated from the equation. Second problem: What about clipping? How do you know what is actual usable power and what is just clipping? WIthout using an oscilloscope or the DD-1 during this test, it is again meaningless. Besides these things it's a neat idea. Please though guys, let's quit making up bogus audio terms. "Ohmage", and "Wdc"? There is no such thing as Watts DC, or Watts AC, or Watts RMS, or Watts Peak.... fml. Its just Watts. I'm not even going to get into "ohmage" Here is a related discussion from a while back. http://www.stevemead...er-by-clamping/ Apparently, we are not the only industry with this problem. Check our the White Paper from APC, the backup power people http://www.xand.com/...TNQYF_R0_EN.pdf We will make a video to demo the situation All SMD products + MORE available at my store here! https://wccaraudio.com/ Subscribe to My Youtube Channel! Over 1,000,000 subscribers strong! Turn on your notifications! http://www.youtube.com/meade916 Follow My Instagram! Daily live feeds from the shop, exclusive content way before it hits my Youtube channel...and little squares with photo's in them http://www.instagram.com/meade916 The Official SMD Facebook fan Page https://www.facebook.com/SteveMeadeDesigns/ Follow my Tweet (Twitter) http://www.Twitter.com/meade916 Link to comment Share on other sites More sharing options...
Kyblack76 Posted September 2, 2012 Report Share Posted September 2, 2012 LOL... knew that was comin to.. D'amore,RAY, SMD > all fixed that..... SMD SUPER SELLER The Burban Build Blazer Build sold Acura trunk build sold Link to comment Share on other sites More sharing options...
meade916 Posted September 3, 2012 Report Share Posted September 3, 2012 got quiet QUICK. All SMD products + MORE available at my store here! https://wccaraudio.com/ Subscribe to My Youtube Channel! Over 1,000,000 subscribers strong! Turn on your notifications! http://www.youtube.com/meade916 Follow My Instagram! Daily live feeds from the shop, exclusive content way before it hits my Youtube channel...and little squares with photo's in them http://www.instagram.com/meade916 The Official SMD Facebook fan Page https://www.facebook.com/SteveMeadeDesigns/ Follow my Tweet (Twitter) http://www.Twitter.com/meade916 Link to comment Share on other sites More sharing options...
will77530 Posted September 3, 2012 Report Share Posted September 3, 2012 show up with facts people cant argue Link to comment Share on other sites More sharing options...
Skullz Posted September 3, 2012 Report Share Posted September 3, 2012 Well it isn't a dyno so there was no way to compare it to the AD1 anyway. 01 Ford focus ZX3 Pioneer AVH-X491BHS PPI PC 4800.2 Morel Maximo 6.5" x2 Link to comment Share on other sites More sharing options...
reharrac Posted September 3, 2012 Author Report Share Posted September 3, 2012 1, thats not an amp dyno, its a monitoring system. 2. Its alot more that the 100 buck you wanted someone to build you one for. sorry, but you dont get a cookie for this one i wanted to pay someone $100 to find me a designer . i would then pay the designer whatever they wanted Link to comment Share on other sites More sharing options...
reharrac Posted September 3, 2012 Author Report Share Posted September 3, 2012 Interesting piece. Here's the major problem I see, the misapplication of Ohms law. Volts X Amps = Watts ONLY works for DC circuits, or where the load is purely resistive (a non inductive resistor). This is not an opinion, this is fact. An amplifier's output is not DC, so clamping, or doing what this piece does (measuring the voltage and current to the speaker and multiplying) is incorrect and inaccurate and only applies to DC circuits or AC circuits with purely resistive loads. A simplified formula for trying to measure power in an AC circuit would be Volts X Amps X Power Factor (phase angle) = Watts. If you don't know the phase angle, your measurement is pretty meaningless. The Amp Dyno uses precision non inductive resistors to do it's calculations so the power factor is always 1.00, and thus can be eliminated from the equation. Second problem: What about clipping? How do you know what is actual usable power and what is just clipping? WIthout using an oscilloscope or the DD-1 during this test, it is again meaningless. Besides these things it's a neat idea. Please though guys, let's quit making up bogus audio terms. "Ohmage", and "Wdc"? There is no such thing as Watts DC, or Watts AC, or Watts RMS, or Watts Peak.... fml. Its just Watts. I'm not even going to get into "ohmage" Here is a related discussion from a while back. http://www.stevemead...er-by-clamping/ Apparently, we are not the only industry with this problem. Check our the White Paper from APC, the backup power people http://www.xand.com/...TNQYF_R0_EN.pdf We will make a video to demo the situation there are a lot of people that use amp clamping for testing. even if it does not tell you the exact amount of watts it will still be a reference point. it will tell you the difference between the amps that are tested. Link to comment Share on other sites More sharing options...
reharrac Posted September 3, 2012 Author Report Share Posted September 3, 2012 so none of you guys have ever used multi meters to clamp test amps? Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.