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DUNU DN-2000J -- More Than Evolution?

May 17, 2015 at 8:34 AM Post #301 of 2,123
brooko said:
Yes the impedance is 8 ohm - but I've tested so far with X3ii, X5, and iPhone 5S - and I'm quite happy with the bass response. DUNU also give an option to close the bass port (with an included rubber ring) to increase sub-bass (haven't tried that yet).

So far I'm finding bass response and overall signature is very tip dependent, so a lot of it will be about personal fit preferences.

What I will say so far is that the 2000J is a seriously good IEM ...... more later.
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aren't they all sources with good or excellent low OI?
(edit, nvm, 5s is quite high apparently at 2 ohms)


>My understanding is not complete but I think output capacitors on the source can cause this issue to occur even if you follow the 8:1 load:source impedance ratio that seems to be generally accepted.

not sure , would be good to confirm. but 8 ohm is definitely bit low. for higher OI sources (say 2-4 ohm which wouldn't be uncommon) from the charts before it was not exclusive to bass but also a bit of a roller-coaster in the highs.
 
May 17, 2015 at 9:14 AM Post #302 of 2,123
udi said:
  Just a forewarning for anyone considering the 2000J, I just noticed the load impedance is 8Ω (not sure if this value is correct?) compared to 16Ω on the 2000 - which was already quite low. This may cause SPL reduction in lower frequencies (equivalent to a high pass filter) from some sources. My understanding is not complete but I think output capacitors on the source can cause this issue to occur even if you follow the 8:1 load:source impedance ratio that seems to be generally accepted.
An issue I noticed even at 16Ω on the 2000 was a tendency for the bass frequencies to start falling off below 50Hz on portable audio devices. It was a non-issue with larger amps (eg. laptop), and also a non-issue with slightly higher impedance IEMs (~40Ω instead of 16Ω on the same portable sources). This is not a problem with the amp being unable to drive the IEM, it's what happens at the other extreme.
 
This stuff has been documented / discussed on head-fi before but it took a lot of digging to actually find it (the issue was first touched on by syvr in the 2000 thread), so I thought I'd mention it here - I suggest anyone buying attempt to test with their source beforehand.
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DUNU often states weird values for their impedance. I'll be getting them measured, so that we can examine what the impedance is for low frequencies (it will increase/decrease in the mids and highs before finally increasing exponentially in the upper treble, because of the way BA drivers work) then.
 
Keep in mind that the DN-2000 also does not have a flat 16 Ω impedance plot, so while it's somewhat close at around 17 Ω at 1 kHz, it's not enough to go by manufacturers' stated values: http://www.innerfidelity.com/images/DunuDN2000.pdf
 
Laptops have "larger" amps?
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May 17, 2015 at 5:33 PM Post #304 of 2,123
brooko said:
  Yes the impedance is 8 ohm - but I've tested so far with X3ii, X5, and iPhone 5S - and I'm quite happy with the bass response. DUNU also give an option to close the bass port (with an included rubber ring) to increase sub-bass (haven't tried that yet).
 
So far I'm finding bass response and overall signature is very tip dependent, so a lot of it will be about personal fit preferences.
 
What I will say so far is that the 2000J is a seriously good IEM ...... more later.
Click to expand...

That's encouraging!  Thanks!
Cheers!
beerchug.gif

-HK sends
 
May 17, 2015 at 9:23 PM Post #305 of 2,123
brooko said:
  LOL - they may get more meaningful info from your measurements Tom - rather than my subjective impressions.  I know I'm looking forward to what you come up with. Not a big believer in rushing it too much - and my 5 days with these so far has revealed that they have a lot of depth to them.  First impression was "this is an improvement" - but I never got the "wow" moment like I did OOTB with the A83.  Funny though - the more I listen to the 2000J, the more I am impressed.  I'm not planning on doing any serios critical comparisons for at least another 4-5 days yet.  I think anyone putting out a review after a very short time listening to new gear is doing the community (and the manufacturer) a disservice.
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Moved this here to make it more relevant.
 
I too didn't ever have a wow moment, but I think once you start doing comparisons, the DN-2000J will start distancing itself from others in a number of critical areas.
 
Interestingly, I'm somehow in the minority that the A83 is not impressive at all.
 
May 18, 2015 at 4:16 AM Post #310 of 2,123
brooko said:
  Yes the impedance is 8 ohm - but I've tested so far with X3ii, X5, and iPhone 5S - and I'm quite happy with the bass response. DUNU also give an option to close the bass port (with an included rubber ring) to increase sub-bass (haven't tried that yet).
 
So far I'm finding bass response and overall signature is very tip dependent, so a lot of it will be about personal fit preferences.
 
What I will say so far is that the 2000J is a seriously good IEM ...... more later.
Click to expand...

 
Cool! Looking forward to your review!
 
May 18, 2015 at 4:57 AM Post #311 of 2,123
A word on tips:
 
Silicone tips will accentuate treble resonances that mask treble extension, while foam tips will tame those resonances. In other words, if people want to hear the energy of a crash cymbal, silicone tips are better, but if they want to hear the decay of a ride cymbal, foam tips are better.
 
May 18, 2015 at 1:58 PM Post #314 of 2,123
tomscy2000 said:
  Keep in mind that the DN-2000 also does not have a flat 16 Ω impedance plot, so while it's somewhat close at around 17 Ω at 1 kHz, it's not enough to go by manufacturers' stated values:
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I'm well aware of the non-linearity, in fact I think that's a big part of the problem with the DN2000 when it comes to higher OI sources. It'll be interesting to see the curve for the 2000J, my guess is it'll be slightly flatter like the 1000 which also had a lower value at 1kHz (~10Ω). It might actually be an improvement over the 2000 if the non-linear impedance curve is to blame for frequency cutoffs moreso than the load/source impedance ratio.

For me personally though, I think 8Ω is too low, completely unrelated to quality I find the 2000 is already a bit of a pain with volume control granularity and accentuating hiss on some sources.
 
svyr said:
 but 8 ohm is definitely bit low. for higher OI sources (say 2-4 ohm which wouldn't be uncommon) from the charts before it was not exclusive to bass but also a bit of a roller-coaster in the highs.
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Agreed, actually wish I'd read your early posts in the 2000 thread before purchasing. I'm fairly happy with them, but full disclosure is always nice which is why I thought I'd mention this here for people to consider beforehand.
 
May 18, 2015 at 9:50 PM Post #315 of 2,123
Just received the final version of DN-2000J. Haven't spent enough time on it yet, but it would seem it is brighter and more analytical than DN-2K. But overall a very well tuned IEM, definitely the best of DUNU so far.
 
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