|
Post by newstarnord on Nov 15, 2022 9:22:04 GMT
Hello,
I am a french hifi enthousiast that like to play with speakers, a little bit of electronics, and convolution engine. I also have headphones, and start to listen to them seriously, however I have limited time for my experiments.
I have found that my Goldring DR-150 are cool to listen to, even when directly connected to the soundcard of my PC. It has a kind of transparent sound with sweet treeble. But it is a wired headphone, and maybe need an amplifier to get the best out of it.
I like the concept of bluetooth headphones. I bougth OneOdio A70 headphones to try them out. They have good reviews on amazon, but because young people like tremendous bass, really exagereted bass, and have also too much treeble.
In summuray, they really lack midrange. They are not very good, but the drivers and the electronics seam to have some potential. What I like is that they have good reviews and they don't have the sdcard reader. Because I fear that the sdcard reader could make it more complex in the electronics.
So, I started to equalize them with Wavelet, and it works, but the sound is better, good, but could be better. I know that sometimes EQ can also destroy sound quality. How did I eq them ? With some experiment with piano music, violin, jazz, and rock music. After that I found a frequency response graph on the web that seams to state that my EQ was good.
Now I stopped that, I don't equalize them anymore. I don't want to always have to use Wavelet, I want also to connect them to tv, etc...
|
|
|
Post by newstarnord on Nov 15, 2022 10:50:58 GMT
So I started to play with the earpads. I completely removed the adaptor plate on which the earpads fit and listened to the headphones. Now when I do that they only play midrange, I have no bass and no treeble when I do that. So I understood that the earpad is what makes high treeble and high bass. So I digged a small hole in the earpads (for the medium to be stronger). And I put the adaptor plate on the headphone, but did not clamped it completely to make the headphones have a more "open" sound (the trick of not clamping the headphones correctly has been found by a mistake I did).
If I don't completely clamp the adaptor I have a wider soundstage and a more "neutral" sound, and I manage to tame the bass. But believe it, the bass is still present, but somewhat more pure, less distorded by over exaggeration, the shortcoming beeing that it seams you don't have sub-bass, but was it real sub-bass (for what I now these bass distorded the overall sound message) ? The treeble is also more balanced.
|
|
solderdude
Administrator
measureutternutter
Posts: 4,881
|
Post by solderdude on Nov 15, 2022 18:46:40 GMT
Perhaps you can post some pictures ?
|
|
|
Post by newstarnord on Nov 16, 2022 8:02:19 GMT
Ok I will send some pictures when I can.
As for the sound quality, I listened to them again this morning and I can't really tell if the sound is good or really good. I found it was really good the day before yesterday, on jazz music. But today on allround music I find it's simply good.
|
|
|
Post by newstarnord on Nov 17, 2022 10:39:40 GMT
In summary I found that at home the sound is really really good (listening to FLAC radio or Amazon Music). It makes me wonder if it is really interesting to buy expensive gear. At work when I sometimes listen to them the sound is not as good (with 128 kps MP3 and background noise and lots of bluetooth devices in the desk). Here are the pictures, the mod is pretty simple, but not very beautiful. Headphone dismantlingHole in earpadDon't mount it completely, only secure 5 clipsI also managed to make it sound darker, by adding a small sheet of paper between the drivers and the ears, but I think it's better without.
|
|
|
Post by newstarnord on Nov 18, 2022 13:19:38 GMT
I do really like the sound of these headphones now. But, playing with a logarithmic sine sweep with 1/f power spectrum, I find that it still lacks midrange between 540 Hz and 2300 Hz. Maybe I like that, but I will try to equalize them and see if the sound is better.
|
|
|
Post by newstarnord on Nov 21, 2022 9:11:27 GMT
Well these modifications were not really necessary. Indeed the diminished midrange came from the smartphone.
Even after the modification, it lacks around +6 dB in the midrange, and it comes from the smartphone.
I realized that when paired with a computer, the headphone now lacks bass. And when connected to a computer, they don't have that lack in the midrange.
However, when paired to my phone, these sound good (with the modification).
The phone is a Xiaomi 11 with sound certified by Harman Kardon. They have modified the equalization for the loudspeakers to sound better (maybe to have better mid-bass). However, it seams that, by doing that, they modified also the frequency response for the bluetooth headphones. Not really a good thing, it seams it is a bug.
|
|