Ford determined some time ago that 10% symmetrical clipping distortion was about the threshold for most automotive audio to have people complaining, and it made the bass a lot louder. Since a lot of the chip amps were made for car audio the manufacturers adopted the 10% spec.
Harman automotive amps had limiters, and it was sometimes tricky to make them have 10% distortion in limiting, particularly when the supply voltage was changing.
Some of the Japanese chipmakers went further and gave a number for a square wave output!
What I am not historically informed on is where the "PMPO" ratings came from. One used to see these silly powered speakers with preposterous power ratings. They were powered from teeny wall warts. Now the low duty cycle of real audio does help you a lot here, but there are limits.
Now most products that I work on or with use 1% onset-of-clipping as the criterion for power ratings. Sometimes less than that.
Kindhornman --- I got it. But it does depend on the connection/connectors used with the cable and equipment connectors, too.
🙂
THx-RNMarsh
🙂
THx-RNMarsh
quick crib for mph/kph conversion is the fibonnacci series, 20mph=30kph, 30mph=50kph, 50mph=80kph etc, good up to licence threatening speeds.
There are two kinds of countries in the world, those that use the metric system, and those that have been to the moon.
All good fortune,
Chris
All good fortune,
Chris
You should google Pokrovsky, and to spare you some further time here a 24 FPS video.
https://www.youtube.com/watch?v=zwfRR9nD6lM
Cubic inches = late 60's American muscle cars (426, 427, 428, 429, and 454), when men were men and Tesla was a coil.
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Several decades ago, PopTronics magazine had an article about what tools you needed in your kit. Tools like a 1/4inch (6.3mm) wrench.
RNM,
Not sure where I was making a comment that you are referring to? See you correction, wasn't me.
Wrinkle,
I didn't think it was an exactly 1.5:1 ratio of kilometers to miles. I think that is close but off enough to get you a ticket. I looked it is 1.6:1, still something I could calculate in my head.
Not sure where I was making a comment that you are referring to? See you correction, wasn't me.
Wrinkle,
I didn't think it was an exactly 1.5:1 ratio of kilometers to miles. I think that is close but off enough to get you a ticket. I looked it is 1.6:1, still something I could calculate in my head.
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It turns out that heat can affect connections. The process of unsoldering a wire from a connector and turning it around without removing the connectors, as I think you said was something you tried, could perhaps change connector behavior just from the heat cycling of soldering. Maybe something to rule out?
Brad,
Don't think I could do the math while traveling down the road with 1.609344 x mph but I could do 1.6 easy enough. Hopefully they still give you the 3mph error here in California for speedo error.
Don't think I could do the math while traveling down the road with 1.609344 x mph but I could do 1.6 easy enough. Hopefully they still give you the 3mph error here in California for speedo error.
The ratio changes with each pair of numbers in the sequence, 50mph 80 kph is 1.6, whilst the true ratio is nearer 1.63, and 50:30 is 1.66666, again close enough to keep you out of trouble
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