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John Curl's Blowtorch preamplifier part II
John Curl's Blowtorch preamplifier part II
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Old 1st February 2013, 04:06 PM   #34001
BV is offline BV  Slovakia
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Quote:
Well, since others got much better results using the same technology,
Show or link please one measurement with gain setting different from 0dB for PGA..All pictures I saw was with gain 0dB (why??), at 0dB it is OK.. I used more than 200 pieces by reliable supplier, all was bad same way? I posted my own experience with it, believe or not..

Last edited by BV; 1st February 2013 at 04:31 PM.
 
Old 1st February 2013, 04:09 PM   #34002
SY is offline SY  United States
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John Curl's Blowtorch preamplifier part II
Quote:
Originally Posted by BV
And differencies between PGA, DAC with OA in multiplying mode and relay attenuator are clearly audible and measurable, even with "ordinary" speakers.
So I'll ask one more time- do you have any data to support your assertion about "clearly audible and measurable" differences between DACs in multiplying mode and relay attenuators? Atkinson's measurements show superb performance.
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Old 1st February 2013, 04:20 PM   #34003
BV is offline BV  Slovakia
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Attached is one measurement for preamp with relay attenuator, difference is visible.. I organized more "sessions" and listeners always prefered version with relay attenuator against PGA or DAC regulation. Most audible are difference between PGA or WM8816 against DAC +OA,and again, DAC is superb compared to PGA or WM, difference DAC vs. relay attenuator is more subtle
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Last edited by BV; 1st February 2013 at 04:28 PM.
 
Old 1st February 2013, 04:36 PM   #34004
PMA is offline PMA  Europe
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John Curl's Blowtorch preamplifier part II
What are those lines near 140/160Hz? Interference intermodulation products? How does it look above 10kHz?
 
Old 1st February 2013, 04:46 PM   #34005
BV is offline BV  Slovakia
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Measurement is with preamp conected in loopback, with desktop PC, it looks same with PC only loopback. Simply measurements artefacts, suppose from monitor . And it is calibrated in dBV..You know all other measurements (10kHz, CCIF, THDvs freq...) from "slovanet".
 
Old 1st February 2013, 04:47 PM   #34006
RNMarsh is offline RNMarsh  United States
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John Curl's Blowtorch preamplifier part II
Quote:
Originally Posted by gpapag View Post
George,

Can you help find (you are so good at it) the hearing research on the perception limits/numbers to apply to GD measurements as thresholds/limits? We can start to use that in evrything we make as a 'pass-fail' parameter. ... Now that we have low cost means to measure it.

It is especially interesting for complete Systems evaluations on both record and playback chains. And, what does typical 'EQ' do to those parameters. How to make better EQ designs. Etc.

Thx-RNMrash








Thx-RNM
 
Old 1st February 2013, 05:07 PM   #34007
SY is offline SY  United States
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John Curl's Blowtorch preamplifier part II
Quote:
Originally Posted by BV View Post
difference DAC vs. relay attenuator is more subtle
OK, so not "clearly measurable and audible."
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Old 1st February 2013, 06:10 PM   #34008
elektroj is offline elektroj  Europe
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Quote:
Originally Posted by BV
difference DAC vs. relay attenuator is more subtle
Quote:
Originally Posted by SY View Post
OK, so not "clearly measurable and audible."
For trained listeners "subtle" is "clearly audible" + we all have seen BV's measurements.
 
Old 1st February 2013, 06:17 PM   #34009
john curl is offline john curl  United States
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Stick to your position, BV. You are showing us what is BEYOND the spec sheet. Almost all engineers know that 'full on' is the easiest position with electronic volume controls.
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Old 1st February 2013, 06:38 PM   #34010
Esperado is offline Esperado  France
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MAS6116 : http://www.mas-oy.com/uploads/Data%20sheets/DA6116.pdf
 

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