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Entry Level AVR with 4ohm minimum impedance

sergeauckland

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#21
Do you have any material on what KEF did other than KEF's advertising? I would like to read up on this as it seems interesting.
As far as I'm aware, KEF didn't publish any 'white papers' on the subject of Conjugate Load Matching. The technique certainly worked, as the impedance plots of the 104.2 (and also the 107) in reviews at the time, showed a remarkably flat characteristic at 4 ohms +- 0.25 ohms as I recall. The crossover boards in the 104.2 were very complicated, and presumably expensive, so perhaps KEF didn't want to give too much away in design details. Sad I think that they didn't continue with CLM, but commercially, if one's customers, and more importantly at the time, the magazines, didn't see it as an important innovation, then why bother?

S
 

3dbinCanada

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#22
As far as I'm aware, KEF didn't publish any 'white papers' on the subject of Conjugate Load Matching. The technique certainly worked, as the impedance plots of the 104.2 (and also the 107) in reviews at the time, showed a remarkably flat characteristic at 4 ohms +- 0.25 ohms as I recall. The crossover boards in the 104.2 were very complicated, and presumably expensive, so perhaps KEF didn't want to give too much away in design details. Sad I think that they didn't continue with CLM, but commercially, if one's customers, and more importantly at the time, the magazines, didn't see it as an important innovation, then why bother?

S
It appears that KEF was very much in the minority and that impedance swings is more than the norm. I believe PSB also produced a speaker with a constant impedance of 4 ohms as well but I dont remember the model. These are the exceptions rather than the rule.
 
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