[ultrabike]

What Philips model is it? Looks a bit high mid centric (and problematic). How does it sound?

 

[vid]

Quote:

What Philips model is it? Looks a bit high mid centric (and problematic). How does it sound?

 
The SBC 3178. Sounded bright and boxy.

 

[vid]

 
Beat that for stock channel matching.
 
I wonder, how is it that these mid-range headphones from the '70s and '80s still today have better-matched drivers than do our present-day overpriced mid- and high-range phones?

 

[xnor]

How? Made in China + 1000% profit.

 

[vid]

AKG K 701
 

 
How I hear them, too.

 

[ultrabike]

A bit bright!
 

 

[vid]

They are. Neither Tyll nor purrin measured their K 701 that bright, but Golden Ears did. Not sure what's up with that.

 

[ultrabike]

Dunno, seems similar to Tyll's plots when uncompensated. What do you get if you remove the artificial ear?
 
EDIT: Actually it does look a little bit like Tyll's compensated plots but yours have a bit more energy in the tremble (about 5 dB.)
 

 

[vid]

My raw uncompensated graph looks very much like Tyll's raw one except with more treble between 5 and 9 kHz or so. I think my measurements do tend to emphasize the treble past 5 kHz by some dB, but even then these K 701 do have a treble peak around 7 kHz for sure since I can hear it as well.
 
The bass measures more like the Q 701, which is curious.

 

[vid]

Another measurement of the K 701 today, done the same way as before.
 

 
 
More or less the exact same as last time, but the big peak at 7 kHz is gone. I took a couple measurements from different ear positions and the peak was missing from all. Guesses?
 
No burning in was attempted, I played maybe 20 minutes of music through them since the last measurement. Measurement error on the first one is possible, but would be odd that a peak at a certain location would be the only difference.

 

[arnaud]

What is your measuring rig and procedure vid?

 

[zorin]

Quote:

How? Made in China + 1000% profit.

Beyerdynamic has its production of headphones in Germany and its T1 model has been having problems with the driver/channel matching.

 

[zorin]

Quote:

Another measurement of the K 701 today, done the same way as before.
 

 
 
More or less the exact same as last time, but the big peak at 7 kHz is gone. I took a couple measurements from different ear positions and the peak was missing from all. Guesses?
 
No burning in was attempted, I played maybe 20 minutes of music through them since the last measurement. Measurement error on the first one is possible, but would be odd that a peak at a certain location would be the only difference.

Did you use the same signal during the second measurement that was used before ? 

 

[xnor]

Maybe because these drivers are more complex and expensive and so they don't want to pick only the best matching ones and throw the rest away? Instead of taking some very well matching and some badly matching pairs, maybe they choose them to get a more consistent matching even if that means overall worse matching?
 
edit: CSD "measurements" usually are done with special signals, not music.

 

[ultrabike]

Quote:

Another measurement of the K 701 today, done the same way as before.
 

 
 
More or less the exact same as last time, but the big peak at 7 kHz is gone. I took a couple measurements from different ear positions and the peak was missing from all. Guesses?
 
No burning in was attempted, I played maybe 20 minutes of music through them since the last measurement. Measurement error on the first one is possible, but would be odd that a peak at a certain location would be the only difference.

 
It is possible to have measurement variability in the high frequency region depending both on position, pad pressure, and mic placement.
 
Interestingly, only that particular region seems different, the rest seems in line with your previous results.