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Blind Virtual Audition of Several Headamps
Blind Virtual Audition of Several Headamps
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View Poll Results: Which amp provides the presentation that you like the best ?
A 1 5.00%
B 7 35.00%
C 1 5.00%
D 1 5.00%
E 2 10.00%
F 4 20.00%
G 2 10.00%
H 2 10.00%
Voters: 20. You may not vote on this poll

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Old 17th February 2017, 11:18 AM   #111
peufeu is offline peufeu  France
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Could you please upload lossless files?...
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Old 17th February 2017, 12:27 PM   #112
xrk971 is offline xrk971  United States
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Blind Virtual Audition of Several Headamps
They take too much room as limit is 1.8MB. I would have to repeat experiment as I did not save the lossless files. So no sorry can't do it.
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Old 17th February 2017, 12:31 PM   #113
peufeu is offline peufeu  France
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Oh, I thought you'd kept them as FLAC or WAV. Sorry about the misunderstanding.
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Old 21st February 2017, 04:04 PM   #114
xrk971 is offline xrk971  United States
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Blind Virtual Audition of Several Headamps
So far only 1 person has submitted to me their guess of amp assignments to sound clips. There is one week left to do so if you want to win the pocket Class A amp as a prize. Minimum 4 correct matches.
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Old 21st February 2017, 05:22 PM   #115
rif is offline rif  United States
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Blind Virtual Audition of Several Headamps
Quote:
Originally Posted by xrk971 View Post
So far only 1 person has submitted to me their guess of amp assignments to sound clips. There is one week left to do so if you want to win the pocket Class A amp as a prize. Minimum 4 correct matches.
I really like this! Are you conncerned about asking 2 different, but not independent questions (which one sounds best and which one maps to which amp), the results of which may be influenced by the other. I think this can skew the results. But I'm not a statistician

Last edited by rif; 21st February 2017 at 05:30 PM.
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Old 21st February 2017, 07:49 PM   #116
xrk971 is offline xrk971  United States
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Blind Virtual Audition of Several Headamps
The latter question is to only be answered by sending me a PM so as to not skew the result of others. Or are you asking if people are asked to guess which one is which, then their own "knowledge", however accurate or inaccurate skews their voting? I suppose it could but then we all wonder what the amps are. I am just asking for it to be committed to writing so we can see how close people are.
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Old 21st February 2017, 08:28 PM   #117
rif is offline rif  United States
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Blind Virtual Audition of Several Headamps
I was thinking about people influencing themselves, if that makes sense. Again I'm by no means educated in this stuff... it just jumped at me when i read about the contest.
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Old 26th February 2017, 05:19 PM   #118
xrk971 is offline xrk971  United States
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Blind Virtual Audition of Several Headamps
Poll closes tomorrow folks. If you haven't voted yet and want to do so please get it in. Also, if you want a shot at the free Pocket amp please send me via PM your predictions.
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Old 27th February 2017, 07:17 PM   #119
xrk971 is offline xrk971  United States
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Blind Virtual Audition of Several Headamps
Default Big Reveal

Here are the identities of the sound clips and their respective amps. Thank you to all that participated.

Although the sample size is very limited, so don't flame me - one thing I see is that two simple transistor amps is all that is needed for good sound with headphones. Ultralow distortion opamps aren't always the best sounding. Overall preference was for the BF862/2SA1837 CFP amp designed by AKSA. The fact that the amp uses the now discontinued, but legendary Toshiba 2SA1837 is no mistake. That is a good sounding transistor!

The Little Pocket Class A amp was not too shabby here either.

Headamp Comparison Key

A = BF862 Pre & DAO
B = CFP BF862-2SA1837
C = CFP BF862-BD140
D = DCG3
E = Fiio A5
F = Pocket Class A
G = SRPP 4 pair BF862
H = Super CMOY 1688


Here is the summary of the test data from the amps on the day the test was made:
Click the image to open in full size.


Note that the pocket class A has since been made into a real PCB with larger output caps and bigger rail caps so performance is even more improved (dynamic range is 94.2dB, stereo crosstalk is -72dB, noise floor is -126dB, freq response is +/-0.5dB 15Hz to 40kHz).

I do want to say that all these amps sound just great and I would be happy with them as daily listeners. However, given a choice, I will take my portable pocket class A amp any day. For sitting down and desktop amp listening, like many of you, I prefer the 2SA1837 CFP amp - it is my reference headphone amp. Now, if only one could squeeze the performance of the big 2SA1837 CFP onto a pocket amp to take with me...
Attached Images
File Type: png Amp-Compare-Summary-2.png (305.2 KB, 1165 views)

Last edited by xrk971; 27th February 2017 at 07:42 PM.
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Old 27th February 2017, 07:22 PM   #120
zman01 is online now zman01  Bangladesh
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Blind Virtual Audition of Several Headamps
Quote:
Originally Posted by xrk971 View Post
The Little Pocket Class A amp was not too shabby here either.
Argghhh, missed voting, but my preference was F - the Pocket Class A amp.

Thanks X for setting this up.
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