Review: NwAvGuy's O2 DIY Amplifier - Page 50  

Quote:

Originally Posted by purrin 

I stand corrected - it's a Prismsound dscope running a suite of tests more comprehensive than RMAA.

That's pretty important.

Quote:

Originally Posted by purrin 

For nwaguy (or at least his more blind followers) to suggest that he is the only one (or the select all-knowing few) who designs amps using bench tests is preposterous. I've seen test equipment and 'scopes on the benches of all the well known reputable amp builders. Not only do the good builders test, but they listen.

What is being suggested is that many designers aren't using proper audio analyzers.

Quote:

Originally Posted by purrin 

 

I stand corrected - it's a Prismsound dscope running a suite of tests more comprehensive than RMAA.

I don't know if you're being sarcastic or not... :(

I do really enjoy your waterfall plots, just hope that you might be able to test SOMETHING for the amp... haha

You didn't think we were kicking up all this fuss over something that looked OK with RMAA? It doesn't even come close to providing anything like decent amp performance metrics. Only thing it really has any use for is FR and crosstalk tests and even they are a bit dodgy. 

You certainly couldn't make anything within a thousand miles of the statements being made about the O2 based on a set of RMAA results.

I freely admit I don't understand much of this "discussion", if that's what it is.

I DO know I just got my O2 a couple of nights ago.  Plugged in my Sansa Fuze with the modded Fostex T50's, and I'M LOVIN' IT!!!!!

Please hold down the noise while I listen to some SWEET music.

Hey Purrin, if you'd like to measure these amps yourself and see what's up, I could TRY and talk to my friends (who own the each individual amp respectively) to haul them to you for testing.

Also, there are measurements for the B22 here:

http://www.ibiblio.org/tkan/audio/beta22.html

There is a problem with comparing the earlier measurements, however.  They're using an audio interface to play back/record signals, and it isn't of the highest quality.

The oscilloscope measurements shouldn't present a problem though.

Quote:

Originally Posted by Willakan 

Likewise, I'm not entirely sure what Anaxilius is on, regardless of his "scientific background." Perhaps he could explain himself in a post that uses logic instead of cheap humour?

Hah.  My sillyness or drug induced rethor was a mimic to illustrate the absurdity of some of those that claim 'objective' standards here.  Nothing more to say on the matter than what has been said already if one simply reads properly.  Not an easy thing for those predisposed to another perspective already.

Nobody can ever claim absolute objectivity with regards to anything: but I still don't see what you're getting at.

Quote:

Originally Posted by Satellite_6 

 

Reversing the burden of proof and claiming the numbers don't mean anything doesn't seem like much of an argument to me, but I suppose it's the only way to be on the other side. . . 

Case in point.

wat. 

I think Willikan has already explained why shifting putting the burden of proof is ridiculous but if you choose to continue to view it differently then I guess that's your prerogative.

Quote:

Originally Posted by Satellite_6 

wat. 

 

I think Willikan has already explained why shifting putting the burden of proof is ridiculous but if you choose to continue to view it differently then I guess that's your prerogative.

Who do you imagine is doing that.

Quote:

Originally Posted by Anaxilus 

 

Who do you imagine is doing that.

wat. 

I suggest you go read the last few pages. 

For the Beyerdynamic dt150 's (250 ohm) with an ipod touch 4g will the o2 be any better than a FiiO E7 USB DAC and Portable Headphone Amplifier. Would the DAC in the FiiO make it better sound quality wise?

Quote:

Originally Posted by Willakan 

The reason they *should* sound the same ....

 

<snip>

 

 

Anyway, there are two possibilities:

 

1) The expensive discrete amps measure as well or better than the O2 and should (should in the context that I would happily bet lots on the outcome: if I lose I'll be too excited about the revolutionary new audio parameters discovered to care about my loss!) sound the same as it into loads they are designed to drive and volume-matched. If they are held to sound different this could easily be verified with a blind test.

 

2) The expensive discrete amps measure decidedly dubiously and it is entirely possible they sound different from the O2.

 

<snip>

It occurs to me that the O2 is a known quantity that has been measured every which way to Sunday.

What is this hypothetical expensive discrete amp the O2 is being compared to?  If it exists, what is it?  Name it.  Let's take a look at it's measurements before we compare it to the O2.

If it's only hypothetical or if it doesn't have the same kind of meaningful measurements, it's not germane to this discussion.

Quote:

Originally Posted by Deltron 3030 

For the Beyerdynamic dt150 's (250 ohm) with an ipod touch 4g will the o2 be any better than a FiiO E7 USB DAC and Portable Headphone Amplifier. Would the DAC in the FiiO make it better sound quality wise?

Hmm, how about paring the O2 with the E7?  I think that would be a good pairing.