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Tech Square Technical and speculative discussion of amps, cables and other topics. |
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Tech Square Technical and speculative discussion of amps, cables and other topics. |
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In Reply to: T/S query:: is "Rms = Zmin - Re"? posted by Mart on April 30, 2006 at 04:36:37:
Hi.If you check up the input impedance curve of a loudspeaker system, you will find it go up & down like a roller-coaster across the audio spectrum. Likewise, its acoustical SPL curve.
I measured the impedance of my upgraded KEF two-way speaker systems from 20Hz to 20,000KHz. Its impedance swings up & down, never drop below 11R nor up beyond 29R. In fact it is quite mild vs a lot of commecial brandnames. This is actually what impedance the amp will look at.
If you check the impedance curve vs the sound pressure curve of the same speaker, you will be surprised they bear little reference or common point with each other. So impedance high or low at one frequency does not indicate it would sound louder or lower at that frequency. So what's the point?
The realistic way I would do is to test the acoustically the SPL curve of the speaker system by using acoustical spectrum analyser from the spot where you sit inside the room. That will tell you the realworld performance of your speaker inside your listening environment.
c-J
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Follow Ups
- Don't go too academic. - cheap-Jack 11:33:04 05/01/06 (1)
- odd, I've measured both - Mart 01:38:39 05/02/06 (0)
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