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Speaker Asylum General speaker questions for audio and home theater. |
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Speaker Asylum General speaker questions for audio and home theater. |
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In Reply to: Re: Has to do with UL testing procedures... posted by Bruce from DC on May 28, 2003 at 12:30:43:
Bruce,I'll try to dig up some more info for you. As to your safety/performance question - the manufacturers desire UL listings for any number of competitive and liability reasons. There are a number of test suites for which a manufacturer can undergo certification testing.
Let's say (just as an example) that the test procedure for a 4 ohm listing consists of 110% rated power all channels into a purely resistive 4 ohm load for 45 minutes. If the receiver's overtemp protection circuit engages at any time, you flunk. If the temperature of the receiver increases by more than 25 degrees C at any time, you flunk. And IF you flunk the 4 ohm test, your entire test submission fails even though you passed the 6 and 8 ohm procedures with flying colors. See how it works?
Austin
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Follow Ups
- Re: Has to do with UL testing procedures... - williak 14:14:15 05/28/03 (1)
- Re: Has to do with UL testing procedures... - Bruce from DC 06:35:25 05/29/03 (0)
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