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Old 17th January 2013, 04:28 PM   #6031
ds23man is offline ds23man  Netherlands
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So maybe we can conclude it is wise to solve the hiss problem on compression drivers with "something" between the amp and driver instead of f..king around with the Ncore?????
 
Old 17th January 2013, 04:40 PM   #6032
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I am aware of the fact that English isn't the native language of either of us, but I do not understand what you are saying here.
Sorry for my poor English.
When the moving coil moves inside the magnet gap, it create a current /tension (motional). More the QTS of the speaker, more it is. And a high efficiency horn is a high efficiency microphone.
This signal is seen by the amplifier, and will be added in the feedback loop of the amp. Any resistance in serial with the driver will create an attenuator with the very low impedance of the amp, and eliminate this. Low impedance cables helps to dump the bass cone speakers resonances, no need for a horn driver.
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So maybe we can conclude it is wise to solve the hiss problem on compression drivers with "something" between the amp and driver instead of f..king around with the Ncore?????
Yes :-)
More than that, as the Ncore is a class D amp, it would be stupid to loose its definition. Limiting its power is like reducing a digital delta sigma DAC to the first bits, in a way. The good way to adapt its power would be to reduce the power supply voltage.

Last edited by Esperado; 17th January 2013 at 04:48 PM.
 
Old 17th January 2013, 04:41 PM   #6033
Julf is offline Julf  Europe
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So maybe we can conclude it is wise to solve the hiss problem on compression drivers with "something" between the amp and driver instead of f..king around with the Ncore?????
Maybe we can conclude that each one of us can do whatever we want with our Ncores? This is diyAudio after all, and there are no absolute reasons for one solution over another...
 
Old 17th January 2013, 04:43 PM   #6034
Julf is offline Julf  Europe
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This signal is seen by the amplifier, and will be added in the feedback loop of the amp. Any resistance in serial with the driver will create an attenuator with the very low impedance of the amp, and eliminate this.
Thank you for the clarification!
 
Old 17th January 2013, 04:54 PM   #6035
jlaakso is offline jlaakso  Finland
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Which one? (just out of curiosity)
hifiharrastajat.org
 
Old 17th January 2013, 05:17 PM   #6036
Julf is offline Julf  Europe
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hifiharrastajat.org
Wasn't familiar with that one - haven't lived in Finland for 15 years. But the cover of the magazine from -89 was a nice nostalgic reminder - I got my Linn Isobariks (still going strong!) from Kruunuradio around that time...

(apologies for the totally OT ramblings of an old expat)
 
Old 17th January 2013, 05:26 PM   #6037
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So maybe we can conclude it is wise to solve the hiss problem on compression drivers with "something" between the amp and driver instead of f..king around with the Ncore?????
Gain adjustement (either up or down) has always be a documented feature in Hypex amps, nothing wrong with that... (when you know what you are doing)
 
Old 17th January 2013, 05:43 PM   #6038
ds23man is offline ds23man  Netherlands
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Maybe we can conclude that each one of us can do whatever we want with our Ncores? This is diyAudio after all, and there are no absolute reasons for one solution over another...
Everybody can do what he wants, but making decisions on wrong assumptions should be avoided ( and can lead to serious damage). The first wrong one, and will not point a finger, is the preservation of the damping factor in use with a horn( aka compression) driver..........
 
Old 17th January 2013, 05:47 PM   #6039
Julf is offline Julf  Europe
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The first wrong one, and will not point a finger, is the preservation of the damping factor in use with a horn( aka compression) driver..........
Horns don't make any exception to preserving damping factor - while the difference between horns and "normal" speakers might be that the horns don't benefit as much from a high damping factor, it doesn't change the fact that a series resistor will spoil the damping factor.
 
Old 17th January 2013, 06:02 PM   #6040
ds23man is offline ds23man  Netherlands
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Horns don't make any exception to preserving damping factor - while the difference between horns and "normal" speakers might be that the horns don't benefit as much from a high damping factor, it doesn't change the fact that a series resistor will spoil the damping factor.
But the question is how much influence it has. As I stated before horn speakers are acoustical damped devices, they do not need any electrical dampening by the amplifier. So there is nothing to spoil with a series resistor. It is a utterly wrong assumption that the damping factor of an amp has an influence on sound quality in horn speakers!

Last edited by ds23man; 17th January 2013 at 06:09 PM.
 

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