Thanks everybody. That saves me a trip to the library. You might read the article and TRY the circuit, you might be surprised.
Mr. Curl
I think it will help you a lot if you read at least one more analysis of the concept
http://vicol-audio.ro/docs/lips.pdf (by J. Vanderkooy and S. P. Lipshitz)
There are other articles too, not all on the internet
George
I think it will help you a lot if you read at least one more analysis of the concept
http://vicol-audio.ro/docs/lips.pdf (by J. Vanderkooy and S. P. Lipshitz)
There are other articles too, not all on the internet
George
What I found most interesting is the model in figure 1. The addition of 2 resistors can change a marginal circuit to something more acceptable.
The whole 'current dumping' concept has not become as popular as its potential to reduce distortion would seem to make it, because the ACTUAL circuitry is compromised just to keep the distortion within a specified limit.
Yet, it is a 'something for nothing' approach, and is interesting to understand why.
The whole 'current dumping' concept has not become as popular as its potential to reduce distortion would seem to make it, because the ACTUAL circuitry is compromised just to keep the distortion within a specified limit.
Yet, it is a 'something for nothing' approach, and is interesting to understand why.
Yes, and switchmode amps in at least John's case. I joked with him at an AES evening event in LA some years ago that I considered Stanley and him to be a tough cop/con cop pair, which he seemed to take fairly well.
The last work I’ve seen on current dumping is by our Dimitri diyAudio - View Profile: dimitri from 1995.
Theory, analysis, new approach, practical circuit.
George
Theory, analysis, new approach, practical circuit.
George
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I don't think anyone knows that more than 25 years ago Tom Colangelo came up from Connecticut uninvited to interview and HR had no one else but me interested in audio enough to talk to him. He was very nice and energetic and he showed me all the Levinson designs he had done (I think it was the 23 that he was most proud of). In the end IIRC making the transition from discrete to IC's would have set him back too far into learning mode. I remember being very sorry, he was such a great guy but I had to do do what was best for the company.
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Oh you mean, Vanderkooy, that makes more sense. It is a problem with the name John, many answer to it. I've met him.
Resistors have two kinds of noise: First is the noise related to the resistors value.
The second is primarily activated by DC voltage across the resistor. Passive crossovers usually suffer mostly from the first noise called: Nyquist noise. Since most passive crossovers operate at line level, the problem is minimized.
The second is primarily activated by DC voltage across the resistor. Passive crossovers usually suffer mostly from the first noise called: Nyquist noise. Since most passive crossovers operate at line level, the problem is minimized.
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Pretty much ignored is that some wire wound resistors can sing. If the coil isn't tight there can be movement and shifts in inductance and resistance. More worrisome in in loudspeakers is the much better known vibration induced noise in capacitors.
Thanks for the response guys and agree on the issues with some wire wound type, i have experienced sonic issues with different wire types and had settled on using Lynk wire wound resistors , for some reason i cant find them anymore....
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