[sigsegv0x0B]

The main thing is try to EQ the bass up and see if you can gain it back. Or is the player giving all it can and you simply can't have it.

Also do listening tests to compare the clip vs the e280.

 

[Butti]

Hancoque, thanks for the results. I wonder if the results for the e280 become very different, when Rockbox is used. Any chance you could try that?

 

[Hancoque]

With the default firmware's EQ it was not possible to get a (near) linear response. But Rockbox did the trick. After some fiddling with the EQ settings, this is the best I could achieve:

e280 + Rockbox + EQ (-13 dB)

But this comes at a cost. To make sure that no clipping occurs due to the boosted frequencies the precut setting has to be set to -13 dB. Therefore a compromise seems to be the best solution. This is with an EQ setting that is clipping-proof with a precut setting of -4.5 dB:

e280 + Rockbox + EQ (-4.5 dB)

 

[sigsegv0x0B]

It basically means the amp on the e280 is infact unable to provide current needed for those low freq. On the other hand at lower volumes it could with rockbox EQ. But even then you need to custom tune it for every headphones..... So unless you require features of this player return it and get the clip.

If you want rockbox get a 5.5G ipod a far better choice then the e280.

 

[sigsegv0x0B]

There is also a question of how much battery life will parametric EQ take? I am guessing the defaults' firmware EQ should be battery life impact free because it's probably done by the codec. While rockboxs' parametric EQ is prolly done via the main CPU which will require much more processing. I recall when using rockbox parametric eq on my ipod photo the battery life turned to crap.

 

[eruditass]

interesting, these tests look significantly different from the ones posted before on this forum, in particular the distortion and clip's freq response.

this software looks interesting.. can it also be used to test DACs and AMPs?

 

[shigzeo]

neither is properly to support 16ohm load. don't worry, there are very few if any players other than 1g shuffle and maybe the new sony's that can

 

[Hancoque]

Quote:

Originally Posted by DoomzDayz /img/forum/go_quote.gif this software looks interesting.. can it also be used to test DACs and AMPs?

Look here for further information.

 

[gldblade]

Hey Hancoque,

I'm really interested in the EQ settings you used to end up with a linear response. Would you be willing to share that information with us?

I know that our results will vary depending on which headphone we use, but I just wanted to do a really quick comparison on an e260 I happen to have

Thanks!

 

[shigzeo]

yes you can use it to test amps and dac. xin does it for all his amps he puts out

 

[Hancoque]

These are the EQ settings I used to get a linear response:
Code:

[left]eq enabled: on eq precut: 130 eq band 0 cutoff: 20 eq band 1 cutoff: 200 eq band 2 cutoff: 800 eq band 3 cutoff: 11000 eq band 4 cutoff: 12000 eq band 0 q: 5 eq band 1 q: 10 eq band 2 q: 10 eq band 3 q: 10 eq band 4 q: 5 eq band 0 gain: 130 eq band 1 gain: 0 eq band 2 gain: 0 eq band 3 gain: 10 eq band 4 gain: 10[/left]

 

[sigsegv0x0B]

Quote:

Originally Posted by Hancoque /img/forum/go_quote.gif These are the EQ settings I used to get a linear response: Code: [left]eq enabled: on eq precut: 130 eq band 0 cutoff: 20 eq band 1 cutoff: 200 eq band 2 cutoff: 800 eq band 3 cutoff: 11000 eq band 4 cutoff: 12000 eq band 0 q: 5 eq band 1 q: 10 eq band 2 q: 10 eq band 3 q: 10 eq band 4 q: 5 eq band 0 gain: 130 eq band 1 gain: 0 eq band 2 gain: 0 eq band 3 gain: 10 eq band 4 gain: 10[/left]

Keep in mind these settings will only work with 21ohm headphones any other headphones will again loose linearity.

 

[Blue Meanie]

Quote:

Originally Posted by sigsegv0x0B /img/forum/go_quote.gif There is also a question of how much battery life will parametric EQ take? I am guessing the defaults' firmware EQ should be battery life impact free because it's probably done by the codec. While rockboxs' parametric EQ is prolly done via the main CPU which will require much more processing. I recall when using rockbox parametric eq on my ipod photo the battery life turned to crap.

Please pardon the intrusion. I haven't done any definitive studies comparing battery life using the Sansa firmware eq vs. the Rockbox firmware w/parametric eq on my e260. But casual observation seems to indicate maybe 5 hours of battery life using Rockbox. I'm pretty sure I got at least 15 hours with original firmware. But these are only rough ballpark estimates. My e260 is only 3 months old, so I'm assuming the battery is in good shape. So yeah, it sucks a bit of power compared to the original firmware, same as your iPod experience.

 

[Hancoque]

I've prepared a sample archive (35.6 MiB) to compare both players. There are six samples à 30 seconds. Three belong to the e280 and the others belong to the Clip. I've called them a[1-3] and b[1-3] so that you don't know which is which. I recorded the samples with 21 ohms load, official firmwares and no EQ. You should listen to the samples with headphones and no further effects like crossfeed because the material already has a Dolby Headphone effect applied.

 

[major_works]

Quote:

Originally Posted by Hancoque /img/forum/go_quote.gif These are the EQ settings I used to get a linear response: Code: [left]eq enabled: on eq precut: 130 eq band 0 cutoff: 20 eq band 1 cutoff: 200 eq band 2 cutoff: 800 eq band 3 cutoff: 11000 eq band 4 cutoff: 12000 eq band 0 q: 5 eq band 1 q: 10 eq band 2 q: 10 eq band 3 q: 10 eq band 4 q: 5 eq band 0 gain: 130 eq band 1 gain: 0 eq band 2 gain: 0 eq band 3 gain: 10 eq band 4 gain: 10[/left]

Any chance you could post the settings with which you got a flat response with a 32-ohm load?