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Re: negative going signal [message #24017 is a reply to message #24015] |
Wed, 07 November 2007 18:23 |
Tom R.
Messages: 51 Registered: May 2009
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Baron |
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I have never heard of doing this before. Is there any documentation on the web that we can look at? If not, can you post further information on what you are doing? Schematic? Line / block drawing? Please advise, Tom R
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limiter operation [message #24018 is a reply to message #24015] |
Thu, 08 November 2007 07:53 |
lcholke
Messages: 73 Registered: May 2009
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Viscount |
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Hi Lito, What order xover are you using? This method is very clever. It looks like the limiter limits the current surges/peaks to the speaker. I wonder if the energy being limited is made of frquencies outside the mid band. -Linc -------------------------- Aphex 1788 mike preamp description: "Microphone Output Limiter - All preamps have a maximum input level. Once that level is exceeded, there is no way to remove that very unpleasant distortion. In order to avoid that occurrence, many engineers set the preamp so that the expected peak level at maximum sound level is still at least 12dB below the clip point. While this provides some insurance against the preamp clipping, it causes a loss of noise performance and, in the case of digital, a loss of resolution. The Model 1788 has a unique limiter (patent pending) in the front end of the preamp which limits the output level of the microphone by as much as 20dB, hence the name 'Microphone Output Limiter'. This allows the engineer to get maximum noise performance and also allows maximum resolution for an analog to digital converter, all without worrying about crashing the preamp."
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Re: limiter operation [message #24019 is a reply to message #24018] |
Thu, 08 November 2007 18:51 |
Tom R.
Messages: 51 Registered: May 2009
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Baron |
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I may be wrong, but I do not think this is what Lito is doing…The microphone output limiter attenuates the entire signal. If I read the posts correctly, he is using a 12AX7 tube before the amplifier to reduce the negative portion of the input signal to the amp, and then to the speaker, so the driver only reacts to the positive portion of the signal. That’s what I have interpreted. Not sure if that is correct, waiting on Lito’s response Tom R
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Re: limiter operation [message #24020 is a reply to message #24019] |
Fri, 09 November 2007 08:28 |
lcholke
Messages: 73 Registered: May 2009
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Viscount |
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Hi Tom, I read the same- tube before the amp. I asked a EE friend of mine about the operation of a std limiter, and he replied that it eliminates the signal peaks by acting as a variable gain stage. The low level signal recieves more gain and the high level signal less gain. This is often used where a mike is to loud and then to quiet as the singer moves about. -Linc
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Re: Negative signal applied to RS 8 [message #24040 is a reply to message #24039] |
Sat, 17 November 2007 13:31 |
tolits
Messages: 21 Registered: May 2009
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Chancellor |
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Hi JP I don’t think there is any thing in the market that would accomplish the negative limiting signal.I am sending you a copy of the schematic I am using. It is very simple to make and maybe you can ask a friend who can make it for you. Remember , I tried this with the open back arrays wherin the effect is pronounced. You can try it with closed back and see if it works for you. Anyways, I play with the adjustment via the variable resisitor until it sounds right adjusting too the level of my DCX. To my ears, I get a setting that is very pleasing to my ears and sounds right.To me it’s like MAGIC. Don’t forget to maintain the correct polarity to the speakers they are driving.If the polarity is reversed, it becomes a positive going limiter. I think too that the daytons are a lot lot better than what I am using.Good luck. I hope it will give you the same pleasure I get from listening to them. By the way ,I am using too a subwoofer and my NEO8 are open back too.x’over is at 754hz.It sounds better with the subwoofer handling 100hz down.I also found out that due to the sheer nos. of the drivers the importance of breaking in the drivers before getting the max. result. I guess an array with so many drivers makes every thing very pronounced. It is like a magnifying glass. Lito
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