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Old 25th June 2011, 01:22 PM   #11
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Join Date: Jun 2011
Default nak stasis

Originally Posted by analog_sa View Post
A little knowledge can be dangerous. Do you actually believe the Nak engineers are that stupid?
The answer to that question might be yes and that nak sacrificed sonics for a higher power bandwidth specification and learned from their mistake. Found this in wikipedia. Its about the hta amplifier they designed following stasis.The time alignment of an amplified music signal and its distortion components has a profound effect on perceived sound quality. Nakamichi researchers discovered that the human ear is much more tolerant of harmonic distortion if the distortion components are time-aligned with respect to the primary signal. Nakamichi Harmonic Time Alignment (HTA) amplifiers adopt a wideband, low open-loop gain design. A MINIMAL AMOUNT OF NEGATIVE FEEDBACK IS USED BUT MORE IMPORTANTLY IT IS KEPT CONSTANT OVER THE ENTIRE AUDIO SPECTRUM This assures the proper timing between the primary signal and any amplifier distortion components. The sonic benefits of this design include powerful, high-resolution bass, a natural, richly detailed midrange, and smooth, clear highs. [citation needed]
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Old 15th August 2011, 01:43 AM   #12
nrg2009 is offline nrg2009  United States
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Location: Detroit, born and raised in the netherlands.
Ha ha! Great advice from the man who knows best. I was looking at buying a nak pa5. I will have to do that after reading these posts.
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Old 2nd November 2011, 11:02 PM   #13
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So... what is it, that needs to be done, in order to obtain better sound like OP asked!??
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Old 13th March 2013, 04:55 PM   #14
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Default I agree with OP, PA5 too bright

NRG2009, I'm also in Detroit. I'm interested in what could be done to bring out more base and reduce the PA5's brightness. Are you aware of what needs to be done?
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Old 14th March 2013, 11:05 PM   #15
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Join Date: Nov 2009
Location: Silicon Valley, California
Look again at post #4 of this thread.

Low frequency gain is set by capacitance C102 in feedback loop.

PA-5 has 10uF, strangely rated at an excessively high 200V. It is not bi-polar.

PA-5 II has 220uF, rated at 15V and it is bi-polar.

Changing C102 from 10uF to 220uF will increase low frequency gain.

At 1000Hz, gain will increase from 27.1 dB to 27.2 dB.
At 50 Hz, gain will increase from 26.1 dB to 27.1 dB.
At 7 Hz, gain will increase from 21.5 dB to 26.8 dB.
At 2 Hz, gain will increase from 15.3 dB to 25.9 dB.

It is also possible that the 10uF, 200V non-bipolar capacitor is adding to the brightness by changing it's capacitance as voltage across it changes from positive to negative. This capacitor should be bi-polar.
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Old 18th March 2013, 12:00 AM   #16
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Thanks James Brennan. I'm looking into electrical engineers around here which could do this.
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