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Open headphone as an upgrade to the DT990 - Page 2

post #16 of 31
Sorry to hear that. Maybe time to get in touch with Hifiman
post #17 of 31
Did you try a different set of headphones plugged into your DAC/amp?
post #18 of 31
Thread Starter 

Yes, the problem only occurs on the HE-400.

Apart from that, when I compared them on my onboard audio (where they work) with the DT990, it didn't feel like I upgraded. They sounded just slightly different to me, not better.

This of course might be due to my untrained ears. I'm contemplating trying more different headphones like HD600/650 or K712 and see if my ears like them more.

post #19 of 31
That's no fun. Definitely sounds like your cable might be bad. I haven't had any problems plugging mine into anything.
post #20 of 31

That's a shame. Are you sure it's the original Canare cable? I've never had an issue with mine, it's good and solid.

post #21 of 31
Thread Starter 

I guess it was the original cable. I just remember it having "made in Japan" written on it.

Anyway I already returned them and instead my K712 arrived to day.

 

My first impression is that they sound much clearer to the DT900. In comparison, voices on the Beyers seem like the singers are having cloth in front of their mouths. The bass however seems lacking a little, it sounds like I would have imagined the K701's bass after reading so much about them. I know the DT990 is known for it's strong bass, so I'll check if I can get used to the more neutral sound of the K712 or if it just won't be enough for me.

post #22 of 31
For the AKG x70x line, there's a bass port mod that'll give you more thump. Completely reversible. Might give you just enough to satisfy. smily_headphones1.gif Or you can take a look at the T90s. They're pretty similar to the DT990s. Slightly less treble and bass but a more balanced and neutral mids.
post #23 of 31
Thread Starter 

Thanks for the suggestion but I'd rather not mod it now for the case it'll be returned. :)

The T90s sadly don't have a detachable cable (god knows why), which is important for me.

 

By the way: 

 

I'm no expert on frequency response graphs, but according to this one, shouldn't the AKGs low end be much much stronger than they actually are?

post #24 of 31
Hmm. Maybe a impedance mismatch? What are you driving it from? The DT990 Pros are 250 ohms, which should be fine on anything with an output impedance of 30 ohms. For the K712, with an impedance of 62ohms, you'll want something under 8 ohms.
post #25 of 31
Thread Starter 

I'm using the Sabre USB DAC 2 with an output impedance of 0.1 ohm.

post #26 of 31
Quote:
Originally Posted by augenleet View Post

I'm no expert on frequency response graphs, but according to this one, shouldn't the AKGs low end be much much stronger than they actually are?

I have not heard the K712s (just the Q701s and I own the K612s), but this graph more accurately represents what I would expect them to sound like based upon what others have said about them, as well as my understanding of the AKG Q/K7xx/K6xx series: http://www.innerfidelity.com/images/AKGK712.pdf

So no. Not much bass response. The whole series tends toward fairly neutral response or only a little bit of bass emphasis.
Quote:
Originally Posted by augenleet View Post

I'm using the Sabre USB DAC 2 with an output impedance of 0.1 ohm.

Sure. That's low enough in impedance. However, the AKG Q/K7xx/K6xx tends to be particularly power hungry because of insensitivity and voltage variation. I don't know much about the Sabre USB DAC 2, but a budget DAC/amp may not power them well. However, that's probably not going to make a big difference on the bass in the way you are looking for.
post #27 of 31
Quote:
Originally Posted by cel4145 View Post

I have not heard the K712s (just the Q701s and I own the K612s), but this graph more accurately represents what I would expect them to sound like based upon what others have said about them, as well as my understanding of the AKG Q/K7xx/K6xx series: http://www.innerfidelity.com/images/AKGK712.pdf

That's cool, looking at the raw, uncompensated graph, you can see that the bass response is indeed very flat.
post #28 of 31
Thread Starter 

Well, I just don't get the graphs. According to them, the K701's bass is on par with other clearly bassier headphones etc, so I'm going to ignore graphs.

 

I actually asked about the voltage before and received this answer:

Quote:
[...] the headphone output on uae23+ will deliver 2V on impedances down to 16ohm. [...]
post #29 of 31
Quote:
Originally Posted by augenleet View Post

Well, I just don't get the graphs. According to them, the K701's bass is on par with other clearly bassier headphones etc, so I'm going to ignore graphs.

According to whom? Innerfidelity? K701s don't look bassy to me: http://www.innerfidelity.com/images/AKGK701.pdf
Quote:
Originally Posted by augenleet View Post

I actually asked about the voltage before and received this answer: "[...] the headphone output on uae23+ will deliver 2V on impedances down to 16ohm. [...]"

Yeah. It's the voltage swing that is the issue with the AKG open headphones which makes it difficult for some amps to power. But I'm not an engineer, so I can't explain beyond that. LOL

Probably best to ask in one of the AKG threads smily_headphones1.gif
post #30 of 31
Thread Starter 

How to read the graphs correctly? Take the Fidelio X1 as an example: http://www.innerfidelity.com/images/PhilipsFidelioX1.pdf

It's often said they have a powerful bass. The graph however shows lower amplitude than the 701 in nearly all low frequencies.

What makes them bassy then? The fact that the graph looks like a parabola?

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