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Old Feb 18, 2017 | 09:09 PM
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Looks interesting.
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Old Feb 18, 2017 | 09:36 PM
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Originally Posted by SgtMic
Several of us here have that tool. It provides a fast and easy way to ensure that the signal being sent to the speakers is distortion free. It is also used to determine at what volume level a HU will start to distort. Google or search YouTube for DD-1 and you will find several instructional videos.
 
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Old Feb 18, 2017 | 11:25 PM
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you can do that with a voltmeter, set it to DC volts.

music is ac voltage- sine waves

distortion is a square wave- which the DC meter will see if it is generated within the headunit or amp.

a meter will not show distortion generated by a speaker reaching limits- but your ears will

Mike
 
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Old Feb 19, 2017 | 10:52 AM
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And the use of ohm's law.
 
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Old Feb 20, 2017 | 09:14 AM
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Something else. https://www.delcity.net/store/Perma!...6y8RoCmcjw_wcB
 
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Old Feb 20, 2017 | 11:17 AM
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They work well.

Mike
 
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Old Feb 20, 2017 | 03:32 PM
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Originally Posted by mkguitar
you can do that with a voltmeter, set it to DC volts.

music is ac voltage- sine waves

distortion is a square wave- which the DC meter will see if it is generated within the headunit or amp.

a meter will not show distortion generated by a speaker reaching limits- but your ears will

Mike
Did you mean AC Volts or have I been doing something wrong?
 
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Old Feb 20, 2017 | 03:46 PM
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I think he is talking about using the DC side of the DMM to identify distortion levels of the HU and amp.

I have the SMD DD1 so I'm not gonna burn my few brain cells on learning his technique but it would be a good topical read to see exactly how he does it and how it compares to a distortion meter.

T
 
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Old Feb 20, 2017 | 05:03 PM
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Old Feb 20, 2017 | 07:02 PM
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This little nano o scope is simple, cheap, and will show you where you clip.
 
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