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  #1  
Old 05-18-2008, 08:41 PM
h1a8 h1a8 is offline
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Default Why are these rmaa results different?

I found a site in Russian that do RMAA tests of different players. They have sony mwz-a815 and cowon d2 results and others too.

For the cowon d2 why isn't the bass rolling off? The results show a more flat response with excellent crosstalk and excellent other things. Is it because they used lossless files and high lossy (320kbps) files?

Here's the link for d2:
http://www.ixbt.com/multimedia/cowon/d2/rmaa.shtml

Sony links:
mp3 320kbps
http://www.ixbt.com/multimedia/sony/nwz-a815/mp3.shtml

and wav
http://www.ixbt.com/multimedia/sony/nwz-a815/wav.shtml

Note: The high frequency isn't boosted like in the NWZ-s615.
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  #2  
Old 05-19-2008, 08:37 AM
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dfkt dfkt is offline
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These RMAA tests are not very useful. They were made without a phone connected, and maybe over a not-so-good sound card, as it looks - or the MP3 test was made with a badly encoded MP3 file. In any case, that's how the D2 would work with an amp attached, not with headphones.

Here's my tests without load/headphone, WAV and MP3: http://rmaa.elektrokrishna.com/Compa...%20MP3+WAV.htm

And here's the D2 with various impedance phones attached: http://rmaa.elektrokrishna.com/Compa...2048%20Ohm.htm

I made these tests for a discussion on iAudiophile, you can read some more here about the WAV and MP3 differences: http://iaudiophile.net/forums/showpo...2&postcount=98

About the Sony tests I can't say, since I don't have that player. But from what I saw in other tests, the Sony doesn't roll off with low impedance phones (same as the Sansa Clip or iRiver H300).
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  #3  
Old 05-19-2008, 12:46 PM
h1a8 h1a8 is offline
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Thanks!
But do you know what BBE or MP do to the RMAA results?
I think the M3B makes the freq graph what it is (the upping the lows and lowering the mids and upping the highs in a wave type of way). I'm curious to how MP and BBE effects the results alone.
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Old 05-19-2008, 12:51 PM
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dfkt dfkt is offline
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The various BBE settings cannot fix the roll-off of the D2, it's a hardware issue. The Russian tests above were clearly made without a phone.

Here's how my favorite D2 settings look with a 16 Ohm phone (BBE@1, M3B@5, MP@on): http://rmaa.elektrokrishna.com/Compa...%20MP3+WAV.htm

Here's the same settings, but with no phone attached: http://rmaa.elektrokrishna.com/Compa...0No%20Load.htm

Quite scary, eh?

Just look around on my site, you might find more tests that could interest you: http://rmaa.elektrokrishna.com/
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Old 05-20-2008, 01:27 PM
h1a8 h1a8 is offline
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Quote:
Originally Posted by dfkt View Post
The various BBE settings cannot fix the roll-off of the D2, it's a hardware issue. The Russian tests above were clearly made without a phone.

Here's how my favorite D2 settings look with a 16 Ohm phone (BBE@1, M3B@5, MP@on): http://rmaa.elektrokrishna.com/Compa...%20MP3+WAV.htm

Here's the same settings, but with no phone attached: http://rmaa.elektrokrishna.com/Compa...0No%20Load.htm

Quite scary, eh?

Just look around on my site, you might find more tests that could interest you: http://rmaa.elektrokrishna.com/
Thanks!
I did look around it but I assumed the M3B is making the graph the way it is. To be sure I wanted you to complete a test with BBE and MP alone (no M3B).
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Old 05-20-2008, 01:34 PM
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Sure, the M3B makes the bass skyrocket - but if you look closely in the two graphs, even with M3B, the 16 Ohm one goes down from 70Hz pretty steep to nothing, while the no-load one has a normal 0dB response at 20Hz.
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  #7  
Old 05-24-2008, 11:30 AM
saratoga saratoga is offline
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Quote:
Originally Posted by dfkt View Post
Just look around on my site, you might find more tests that could interest you: http://rmaa.elektrokrishna.com/

Amazing resource, thanks!

I only wish ABI could start posting RMAA results in it's reviews.
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  #8  
Old 05-25-2008, 10:14 AM
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EnzoTen EnzoTen is offline
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Quote:
Originally Posted by saratoga View Post
I only wish ABI could start posting RMAA results in it's reviews.
Im working on it =)
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