November 20, 201311 yr Can you provide more details about how the THD and clipping are actually measured?Are the units calibrated prior to being sent to customers? What are they calibrated against if so? What is the accuracy of the device? What is the uncertainty?
November 20, 201311 yr The idea of the Amp Dyno is that it would be purchased and used by dealers of home, pro, or mobile audio equipment. It is a tool for them to sell one amplifier over another, and to help them sell better accessories like power and speaker wire. One example: A customers system can be dyno'd in their car, their wiring upgraded and then redyno'd quantifying the improvements and placing value on them.
November 20, 201311 yr The unit measures both harmonic distortion via our DD-1 circuitry, and clipping via a microprocessor and high speed A/D converters. The mode the Dyno is operating in determines if it will use the harmonic distortion detection and clipping detection, or just clipping detection.
November 20, 201311 yr The idea of the Amp Dyno is that it would be purchased and used by dealers of home, pro, or mobile audio equipment. It is a tool for them to sell one amplifier over another, and to help them sell better accessories like power and speaker wire. One example: A customers system can be dyno'd in their car, their wiring upgraded and then redyno'd quantifying the improvements and placing value on them.I'm just some idiot (truly) but I have a few real questions. I'm assuming that this has no real use for an average or even an "extreme" car audio user, even the results? It is mainly meant to advertise a companies product? This device does use the dd1 correct? I'm fairly local to you too, I'd love to "shoot the shit" at a show or something if you plan to attend any you should let me know.
November 20, 201311 yr The Amp Dyno is a pro level tool. Yes it has 2 independent DD-1s in it. We have a consumer level tool coming out in a few weeks. It is called the AMM-1. It's a audio oriented multimeter. It measures dc voltage, ac voltage, ac current, phase angle, power factor, VA, Watts, Impedance, and frequency. It's a handheld device.
November 20, 201311 yr The Amp Dynos are all hand-built and calibrated by D'Amore Engineering in Tempe, AZ. Tested against several references including an audio precision, and a HP8903A
November 20, 201311 yr The unit measures both harmonic distortion via our DD-1 circuitry, and clipping via a microprocessor and high speed A/D converters. The mode the Dyno is operating in determines if it will use the harmonic distortion detection and clipping detection, or just clipping detection.Okay, so you used the word measure which implies that you understand uncertainty and accuracy. Your nooblet customers don't and/or your system is displaying non-significant digits. For instance:Today at Skar Audio we put the Skar Audio SK-4500.1D on our newly built test bench and got it all set up with the SMD AD-1 Amplifier Dyno for power testing results... SMD AD-1 Amplifier Dyno Testing Results Model: Skar Audio SK-4500.1D Monoblock Amplifier Certified Run at 1 Ohm : 4,943 Watts at 13.85 V Un-Certified Run at 1 Ohm : 4,996 Watts at 13.85V Dynamic Power Run at 1 Ohm : 6,208 Watts at 14.88 V Dynamic Power Run at 0.5 Ohm : 8,641 Watts at 15.42 VKevin is obviously VERY confused on how to use the device which makes these questions extremely pertinent.Can you provide more details about how the THD and clipping are actually measured? Are the units calibrated prior to being sent to customers? What are they calibrated against if so? What is the accuracy of the device? What is the uncertainty?Please answer. Also note, saying you use a DD-1 to measure distortion is not a method, techniques to measure distortion are very defined and rather easy to follow. How do you implement that?
November 21, 201311 yr Popular Post It uses non inductive passive loads. They are braking resistors for a light rail train. M5, why so condesending. I have an education. Yes I understand those terms just fine. The power measurement is done via 10 bit A/D. It's about +/- 2% for power. As far as the distortion detecting, they are calibarated to 1.0% +/- 0.1% If you are more interested in how our distortion detecting works you can read the patent here: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=1&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=1&f=G&l=50&co1=AND&d=PG01&s1=20130044886&OS=20130044886&RS=20130044886
November 21, 201311 yr So the system is not a full spectrum analyzer? It only measures at 4 predetermined points if I understand as the patent states the filters are band passed at the 4 selected hertz. So say if I was manufacturing a highs amp and I pick my 4 measurements points of say 100, 500, 1000, and 1500 hertz. If the amp had any distortion anomalies at say 350 hertz the analyzer wouldn't be able to pick it up?
November 21, 201311 yr The unit measures both harmonic distortion via our DD-1 circuitry, and clipping via a microprocessor and high speed A/D converters. The mode the Dyno is operating in determines if it will use the harmonic distortion detection and clipping detection, or just clipping detection.Okay, so you used the word measure which implies that you understand uncertainty and accuracy. Your nooblet customers don't and/or your system is displaying non-significant digits. For instance:>Today at Skar Audio we put the Skar Audio SK-4500.1D on our newly built test bench and got it all set up with the SMD AD-1 Amplifier Dyno for power testing results... SMD AD-1 Amplifier Dyno Testing Results Model: Skar Audio SK-4500.1D Monoblock Amplifier Certified Run at 1 Ohm : 4,943 Watts at 13.85 V Un-Certified Run at 1 Ohm : 4,996 Watts at 13.85V Dynamic Power Run at 1 Ohm : 6,208 Watts at 14.88 V Dynamic Power Run at 0.5 Ohm : 8,641 Watts at 15.42 VKevin is obviously VERY confused on how to use the device which makes these questions extremely pertinent.Can you provide more details about how the THD and clipping are actually measured?Are the units calibrated prior to being sent to customers? What are they calibrated against if so?What is the accuracy of the device? What is the uncertainty?Please answer. Also note, saying you use a DD-1 to measure distortion is not a method, techniques to measure distortion are very defined and rather easy to follow. How do you implement that? What in your opinion is wrong with the testing that Kevin published?
November 21, 201311 yr IIRC, all those affiliated with SMD attempted a similar marketing ploy here with the DD1 and it was futile. . . . But any publicity is good publicity.I take it you don't approve of that tool either?
November 21, 201311 yr The general consensus that I have gathered around here, is that, the DD-1's flaw is that is sees the clipping at 'x' db as determined by the track of the cd used at 40hz. But not all music is recorded at a set db or at 40hz. Therefore you can still drive you amps into clipping an possibly damage your driver. And that, basically, using you senses is the best way to know is you are 'stressing' your speakers. Which also plays to the scenario where you have a 1000 watt woofer, and a 2000 watt amp(*assuming RMS ratings are accurate)- setting you amp to the realm of clipping is unnessasary. Again- not speaking for the board- just my perception of what I have read. I appreciate that you have 'stepped into the lions den' to answer these questions directly. I believe the spread of knowledge helps us all. For a question that I want to ask...When using your DD-1 technology, and it sees 'clipping' it this the 'end all' signal that you have match your gain to the voltage from the H/U or Source? i just wish amps had a switch for 2v,4v,5v input voltage, and none of this would be confusing.LOL
November 21, 201311 yr A switch would be pointless because preout voltage from HU changes with volume and source material. What you would want is clipping suppression that is used in many Pro Audio devices.
November 21, 201311 yr The general consensus that I have gathered around here, is that, the DD-1's flaw is that is sees the clipping at 'x' db as determined by the track of the cd used at 40hz. But not all music is recorded at a set db or at 40hz. Therefore you can still drive you amps into clipping an possibly damage your driver. And that, basically, using you senses is the best way to know is you are 'stressing' your speakers. Which also plays to the scenario where you have a 1000 watt woofer, and a 2000 watt amp(*assuming RMS ratings are accurate)- setting you amp to the realm of clipping is unnessasary. Again- not speaking for the board- just my perception of what I have read. I appreciate that you have 'stepped into the lions den' to answer these questions directly. I believe the spread of knowledge helps us all. For a question that I want to ask...When using your DD-1 technology, and it sees 'clipping' it this the 'end all' signal that you have match your gain to the voltage from the H/U or Source? i just wish amps had a switch for 2v,4v,5v input voltage, and none of this would be confusing.LOLWell understood. The tool lets the user decide if they want to setup the system with no possibility of clipping whatsoever if they choose. Most people don't prefer this setting in practice though.
November 21, 201311 yr The general consensus that I have gathered around here, is that, the DD-1's flaw is that is sees the clipping at 'x' db as determined by the track of the cd used at 40hz. But not all music is recorded at a set db or at 40hz. Therefore you can still drive you amps into clipping an possibly damage your driver. And that, basically, using you senses is the best way to know is you are 'stressing' your speakers. Which also plays to the scenario where you have a 1000 watt woofer, and a 2000 watt amp(*assuming RMS ratings are accurate)- setting you amp to the realm of clipping is unnessasary. Again- not speaking for the board- just my perception of what I have read. I appreciate that you have 'stepped into the lions den' to answer these questions directly. I believe the spread of knowledge helps us all. For a question that I want to ask...When using your DD-1 technology, and it sees 'clipping' it this the 'end all' signal that you have match your gain to the voltage from the H/U or Source? i just wish amps had a switch for 2v,4v,5v input voltage, and none of this would be confusing.LOLTons of respect for having the stones to come in here and answer the hard questions. Tons.
November 21, 201311 yr IIRC, all those affiliated with SMD attempted a similar marketing ploy here with the DD1 and it was futile. . . . But any publicity is good publicity.I take it you don't approve of that tool either?Did I type that? The general consensus that I have gathered around here, is that, the DD-1's flaw is that is sees the clipping at 'x' db as determined by the track of the cd used at 40hz. But not all music is recorded at a set db or at 40hz. Therefore you can still drive you amps into clipping an possibly damage your driver. And that, basically, using you senses is the best way to know is you are 'stressing' your speakers. Which also plays to the scenario where you have a 1000 watt woofer, and a 2000 watt amp(*assuming RMS ratings are accurate)- setting you amp to the realm of clipping is unnessasary. Again- not speaking for the board- just my perception of what I have read. I appreciate that you have 'stepped into the lions den' to answer these questions directly. I believe the spread of knowledge helps us all. For a question that I want to ask...When using your DD-1 technology, and it sees 'clipping' it this the 'end all' signal that you have match your gain to the voltage from the H/U or Source? i just wish amps had a switch for 2v,4v,5v input voltage, and none of this would be confusing.LOLWell understood. The tool lets the user decide if they want to setup the system with no possibility of clipping whatsoever if they choose. Most people don't prefer this setting in practice though. See here you go. You got it. Unfortunately, it is not marketed that way.
November 21, 201311 yr ^^^^^^this is true. A lot of peopld don't know that its not the "be all, end all" tuning device. Better marketing needs to be done
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