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Old 16th December 2010, 03:35 PM   #1
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Default Class A Listening fatigue

I have made a Class A amp using single mosfet and others using BJT or a Darlington for the only active component.
While it sounds deep and rich...great imaging, transparency and detail...I can't listen long without experiencing listening fatigue...I am not playing at loud volumes. I experience this both when the highs are overpowered by the lows and when the highs are a little bright.
I have been unorthodox in using a switching power supply that switches at a rate well into the GHZ.

Could the switching power supply cause the fatigue?...(the sound of tv's and computer monitors used to drive me crazy)
Or would second order Harmonics play a role in this?
Or both?
I got the THD down to .3% on the simulator ( not the most accurate) and I hear very little distortion...but the ear is not the most accurate for THD...just the most accurate for what sounds right.
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Old 16th December 2010, 04:02 PM   #2
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by rcollege View Post
I experience this both when the highs are overpowered by the lows and when the highs are a little bright.
I would like to see your speakers
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Old 16th December 2010, 04:08 PM   #3
AndrewT is offline AndrewT  Scotland
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Default ClassA listening fatigue and switching PSU

Quote:
Originally Posted by rcollege View Post
Could the switching power supply cause the fatigue?...
this does not sound like a nice combination.
Let's see the schematics and the build.
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Old 16th December 2010, 04:14 PM   #4
Root2 is offline Root2  United Kingdom
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Quote:
Originally Posted by rcollege View Post
I have made a Class A amp using single mosfet and others using BJT or a Darlington for the only active component.
While it sounds deep and rich...great imaging, transparency and detail...I can't listen long without experiencing listening fatigue...I am not playing at loud volumes. I experience this both when the highs are overpowered by the lows and when the highs are a little bright.
I have been unorthodox in using a switching power supply that switches at a rate well into the GHZ.

Could the switching power supply cause the fatigue?...(the sound of tv's and computer monitors used to drive me crazy)
Or would second order Harmonics play a role in this?
Or both?
I got the THD down to .3% on the simulator ( not the most accurate) and I hear very little distortion...but the ear is not the most accurate for THD...just the most accurate for what sounds right.
GHz SMPSU I would love to see that sounds like fun.
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Old 16th December 2010, 04:24 PM   #5
WuYit is offline WuYit  Sweden
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Hi,
the cure is a decent (big & bulky) power supply.
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Old 16th December 2010, 05:18 PM   #6
Root2 is offline Root2  United Kingdom
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Quote:
Originally Posted by WuYit View Post
Hi,
the cure is a decent (big & bulky) power supply.
Regulated or just Bulk caps, and how fast if regulated should the feedback control be for the PSU? any thoughts?
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Old 16th December 2010, 06:21 PM   #7
WuYit is offline WuYit  Sweden
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Root2,
just bulk caps will not suffice, either choke regulation or something like this:
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Old 16th December 2010, 06:48 PM   #8
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Maybe too much odd order distortion?
The second order distortion should not harm sonically, but 3rd, 5th a.s.o. might and even low values are audible.
Could be the price for a very simple amp.
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Old 16th December 2010, 07:21 PM   #9
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I seriously doubt that listening fatigue is down to the amp itself, unless it oscillates or produces extreme amounts of overtones. Listening fatigue in my experience is usually what happens if you listen to a non flat frequency respons, which is usually caused by room influence, or the speakers themselves. Especially, if you have a peak in the region where the human ear is most sensivite, 2-5 kHz, you are very likely to find it fatiguing, even if this initially might be experienced as "great imaging" and detail.

Just my 5 cents worth.......

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Old 16th December 2010, 08:19 PM   #10
Bigun is offline Bigun  Canada
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Could it be the source and not the amp ?
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