Originally Posted by ultrabike
The more I think about it, the more I believe my Qts exercise there was futile... I learned something so it was probably not all for nothing .
All these Q-things (Qts, Qc, Qtips, and so forth) should all be already lumped into the overall SPL impulse response measurement of a headphone. All those parameters are probably more useful in speaker development than in headphone characterization. From the impulse response (+ possibly some compensation due to HRTF or so) one can derive FR magnitude/phase, CSD, step response, square wave thingys, and other stuff.
If a headphone performs poorly in SPL FR and distortion measurements, it more than likely will suck regardless of price.
Hello ! actually you are perfectly right. We can treat the HP as a black box and just see its test performances.
I would add the square wave test to the list even if as many say it is not a "natural" signal
Nevertheless it is a very demanding test that can tell something about the dynamic behaviour of the driver
I have never seen, for instance, the response to SW of a Stax. I am pretty sure it should be just amazing
What is intriguing is that also cheap headphone can have nice results in the lab, and i suspect also at the listening.
The problem is to spot them but i have to read a lot this forum because something very interesting often shows up.
I actually used to own the DT990 250 ohms, and felt it was quite a bit bright.
No channel imbalances, no huge distortion issues, or wild frequency peaks though.
Just too much energy in the tremble region that resulted in some fatigue after a while (it's fine if equalized though.)
I have just start using them with a Fiio e9. They are well built, robust
i think the break-in will take a while
I do not like the felt over the transducer
For me the Grado solution is hugely better and i suspect it improves the transparency
Problem is that i would not want to damage the Beyer but i will try to remove the felt ... maybe i will get even more highs but i am sure the sound will improve
Every layer between the transducer and the ear decreases transparency
I tested this on two cheap JVC and one AKG. Always better sound
So I went for some HD558 which I ended up liking quite a bit more.
I like Senn very much. They are controlled and clean
To add some warm it is possible to select the right amp, or maybe even a solid core cable as a extension cord can work.
There are some very good, but expensive headphones though.
Stax 007/009 electrostatic headphones tend to perform very good in distortion numbers.
HD800 headphones also seem to do very good in distortion numbers relative to other dynamic headphones. I don't feel that their transducer technology is all just marketing mumble jumbo. Note however that ring radiators are not exactly a new thing. Just probably not as applied to headphones as other types of transducers.
The Stax and the HD800 also seem to have fairly good SPL FR performance numbers. Stax headphones however have specific amplification requirements. HD800 might be driven by more conventional amps, but they still have relatively high impedance numbers. None of these headphones are portable.
You are talking about the very top HPs. I listen to the Stax and it is a very different experience
They were the Omega do not the number. Initially they seem lean and a little bright
But then it is easy to understand that it is just that the distortion is very very low.
I did not try the HD800. Too expensive for me anyway, but extremely attracting.
Has far as the Asgard having hum problems, my understanding is that this could be due to ground loop problems.
Schiit recommends to use a 3 to 2 prong adapter in such cases (http://schiit.com/ownersmanual/asgard_manual_1.0.pdf).
As far as heat, well it seems this amp is class A.
I am very very interested in the Asgard 2 and i have the opportunity to buy one
What i read it is confusing at least. Spectacular sound but also remarkable problems
I understand that it is better with 100-300 ohm HPs, so it should be work fine with the dt990 250 ohm
A Schiit Magni is class AB and might be cooler (http://schiit.com/cart/index.php?main_page=product_info&cPath=0&products_id=13).
This is also very very interesting. And it could be the best choice for me (i am not looking for extreme performance just a good rendition of voices because i have to follow dialogues in English during movies and tv serials. Yes, I am trying to improve my level. Not that easy I am afraid.)
i will wait a little and read further reviews expecially on the Magni
Thank you sincerely again for your kind and very valuable advice
My best regards,