CHANGSTAR: Audiophile Headphone Reviews and Early 90s Style BBS
Lobby => Headphone Measurements => Topic started by: Bill-p on March 24, 2015, 12:57:00 AM
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Here's how this one looks like on my rig.
All stock. No mod. No special treatment.
Mod can take off a lot of treble. Click here for some measurements and some more details. (http://www.changstar.com/index.php/topic,2226.msg61395.html#msg61395)
Dip at 4KHz isn't a measurement artifact. I keep seeing it no matter position. It's filled in CSD, but I suspect this "gap" that we are seeing is as a result of some impulse response issue or something like that, and this probably contributes to the treble sounding kinda "rough". And by the way, it actually does sound kinda rough.
Other than that, very very very clean sound. Bass is weird. Not just because of the bumpy FR, but because it really does sound weird. Not boomy, or strong, or even that emphasized. My Z7 and LCD-2 eats this one for breakfast... both at sub bass extension and bass impact. It actually sounds kinda... lean. And that dip at upper bass allows for some clarity, but does suck the soul out of the music. Makes for a thin sound.
This one is very clean sounding, though. I think cleaner than even the HE-560. If only its treble could be tuned down by another 3dB.
Overall, not bad at all. It won't get my seal of approval with dat treble, but it is admittedly a very decent headphone.
And maybe I got lucky or somethin'. Maybe a cherry unit? :)p1
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Your measurements are fairly consistent with solderdude's (https://diyaudioheaven.wordpress.com/headphones/measurements/brands-a-i/).
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Thanks!
I thought I was going crazy, because no matter how I positioned the headphone, that null didn't want to go away. And yet CSD kept hiding it. Very weird...
Anyway, this headphone does sound like how it measures. Lotsa treble. Very even elsewhere. Kinda peaky and uncomfy. EQ treble down does wonders here. There is a fair bit of midrange distortion, so sense of soundstage is not as good as my Z7 or LCD-2, but it's still very good for the price. Honestly, I'm kinda surprised to see the premium version doing so well, given how I've seen the pro version measures. This coupled with some good front-damping would probably be killer!
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I assume the 250ohm is less bassy than the 80ohm? Or do you think you are not getting a good seal?
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Felt = Win, and perhaps a little foam inside the cups could help with the midbass dip.
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I think it's because the pads have deteriorated, and the headband is very loose, so I couldn't get a good seal either on my head or on the coupler, and the result is that bass output. Any other headphone sounds monstrous in comparison, since this one is so bass-light. Extension is quite good, though it gets soft at the extremes, likely due to higher distortions. I can't measure distortions worth my life, so I'll defer that measurement to some other folk. Will bring this pair in stock condition to CanJam and leave it to you for further measurements, if it's alright, Marv.
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Heard the DT770 myself and it was (to my ears) more bassy than what your measurements suggest.
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The 250 ohm dt770 isnt bassy at all. The dt880 is bassier
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The 250 ohm dt770 isnt bassy at all. The dt880 is bassier
Definitely not my own experience with those headphones. Maybe bassy is not the right word though. IMO the DT770 is mid bassy but the DT880 extend better in lowest frequencies if I remember well.
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Well, this one is not bassy at all. I think it's due to the clamping force (or lack thereof) and the ear pads.
It sounds like feather. A bit ethereal, even. Certainly lacking warmth like my LCD-2 and Z7, and yet not as separated/clean as the other 2.
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And... front damping applied. No not felt. Felt didn't do squat. Even when there are like... 3 layers of it. I think felt only increases decay at low frequencies, and doesn't really dampen high frequencies.
So how did I do it? Try... tissue, or some form of thick paper.
Measurement of the result attached. I used 2 layers of tissues underneath, then a piece of felt on top (makes things more "romantic"). No longer bright or piercing. Sounds... almost right. Save for that dip at lower frequencies.
And yeah, bass was raised. I don't think it's a measurement artifact. I think what happens is... the paper Beyer used is still not completely sealed, so the driver couldn't pressurize the back chamber as much for bass. And now it can.
Funny enough, dip at 4KHz is now much less pronounced in FR as well. Removing front damping causes it to rise up again. Now I'm at a loss on how to explain it... though treble does sound a lot less rough.
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Some felts work, some don't. 1-4mm wool textiles often do the trick, so does paper.
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I guess I should try out different kinds of felt, then... but even layering up 3 layers of 2mm thick felt didn't really do much, so I sort of doubt that other kinds of felt would do.
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2 different looking drivers, both 250 Ohm, and both fit into DT770.
Subjectively, one is brighter than the other. It's the one with the metallic looking "dome" thing under the paper layer.
Measurements and stuffs incoming... (will probably have to wait until this weekend when I have more time to solder)
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Are those both from 770's?
Any why haven't you slapped some tesla drivers in there yet? :P
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I do have a Tesla headphone here... T5P. :P
Will get to work on it once I'm done with DT770.
And this means I'll have another working pair of DT770 in the Pro body. Would be cool for comparisons and stuffs. :)
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I have a dt770 pro. For front damping, I used about 13 sheets of toilet papet, uncut. I laid them two at a time (crosswise to another, so it looked star-shaped instead of a rectangle/square shape). I added a little polyfill under the ear pads. Then I ripped the layers one at a time, so by the time I got the last layer, the front damping tapered down. So the damping is cone shaped, basically. I won't be rigorous, but the macro and microdynamics improved. Say, punch, pianofortes, crescendos, sound envelope. Right now it's leaning toward a warmish sound, but all the instruments sound fairly correct. I also have polyfill in the cavity, the bass cage removed, and the previous acoustic tape removed, so that could partly account for the warm sound.
Thanks for the paper in front of the driver damping idea, Bill.
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I agree and prefer the bass extension on the DT-880 250 ohm versus the DT-770. I think the semi-open DT-880 helps tame the harsher sound of the stock 770. IMHO.