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#1 |
diyAudio Member
Join Date: Jul 2010
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Does anybody know the loudness specification of NAD 3020? I couldn't info about it although found many schematics or service manuals on the internet. I'd like know what frequencies does its loudness boost and how much dB of boost? Thanks in advance
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#2 |
diyAudio Member
Join Date: Dec 2012
Location: The Jurassic Coast, England. GB
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Specifications
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#3 |
diyAudio Member
Join Date: Sep 2003
Location: Midland, Michigan
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If you own that model, why not measure the loudness contour?
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Frank |
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#4 |
diyAudio Member
Join Date: Jul 2010
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#5 | |
diyAudio Member
Join Date: Jul 2010
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Quote:
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#6 |
diyAudio Member
Join Date: Dec 2009
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The characteristics are taken in the form of curves of the dependence of the output voltage on the frequency of the input sinusoidal signal. A signal generator or smartphone app is being used.
Several curves are taken at different volume levels. A logarithmic scale is usually used. |
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#7 | |
diyAudio Member
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Quote:
There's quite a problem to duplicate the control though. You need a dual, tapped 20k log or audio taper potentiometer. Good luck finding any affordable tapped pot with the same characteristic now and you'll need a miracle to find the exact type for your particular version of the 3020. (there were many versions over the years) The best you can hope for is a fairly close version but I doubt you'll find just what you need. The reference schematics show the filter and volume control as described on several NAD models and the volume control with the associated switch and RC filter is identified as VR1a and b on early model schematics showing the switching and tone control section and other sections of the amplifier in separate diagrams. You can find these at hifiengine and elsewhere on the net. Last edited by Ian Finch; 16th September 2020 at 05:05 PM. |
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#8 | |
diyAudio Member
Join Date: Apr 2018
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Quote:
The graph is taken from: The Mysterious Loudness Control: What Does It Do? | Extron |
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#9 |
diyAudio Member
Join Date: Dec 2009
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Depends on the position of the volume control.
Linear at high volume. |
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#10 |
diyAudio Member
Join Date: Apr 2018
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Yes, the graph shows very little, or no, compensation at high levels - the blue dotted line.
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NAD 3020 hum | rigadig | Solid State | 13 | 31st May 2004 10:33 PM |
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