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| Date: |
August 10, 2003 at 00:02:33 |
| From: |
Adrian Mack, [dialup-196-97.wasp.net.au] |
| Subject: |
About DC components in clipping |
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URL: My website, Peerless XLS 12 Dual PR Sub Project, 18LW1400 vented sub, Horns, etc..... |
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Hi DJK and Richard!
I was talking today to a mate of mine who takes an Electrotechnology course at Otago Polytechnic in New Zealand. And it seems that DJK is right about the DC component, at least, he is in accordance with this person taking the course.
They are using osciloscopes there, and the DC component made the cone on a test unit move instantly outward, very quickly. This could be related to when DJK made observations on the 2235H unit, and the 100W amp causing it to slam into the front plate.
The clipped portion of the signal is DC, and the non-clipped is AC. The corner is where the AC bit joins the DC part. This component, as DJK stated, is 1-2Hz, and causes excessive cone motion. What will happen is the cone will stop for a split second when the clipped signal is applied, and this will continously happen as changes in the signal are infinitly occuring. If it was just DC forever - like a 3V DC battery, the cone should just stay there. If we vary it slowly 0v to 3v DC, the cone will move and should produce some sound. This is all rather mute however seeing as its not the entire waveform thats DC on a clipped signal. But its interesting though. This tends to make a speaker driven into clipping have poorer cone control too, being constantly "stopped" for split seconds, every split second. I've noticed this too, when using a 240Wrms plate amp on my 18LW1400 18" woofer - excessive cone motion, and rather uncontrolled too (AND ALSO A VERY AWFUL CLIPPING SOUND!). But back on with 1.3KW Lab Gruppen - the problem is gone. So its fair to say this component is death to the woofer - clipping a woofer, in extremes, is death if it hits the front plate.
The ideas that DJK has described to prevent clipping are accurate. And djk, if you want to step in here to offer a bit more of an opinion - go for it!
Adrian
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