bigshot
Headphoneus Supremus
Is that chart not corrected for Fletcher Munson? If not, that's pretty close to what I measured, except with mine the bump up at the end was around 6kHz and it was half that size.
Does the frequency response change when using the velour pads?
The measurement (and comparison against hd650/hd800 and lcd2) is very interesting: you can see the slight drop in bass / low bass response with the pm1, just like a velours pad hd650 or hd800.
Thanks!
Here's the non-smoothed version of the same measurement (just change 4343 to 4342 in the url):
To human ears, that is going to sound flat down to the edge of hearing. I'd imagine that a balanced response in the sub bass is the goal of any premium quality headphone. The bass in all the cans on your comparison chart is the same.
It's not about sub-bass extension but the profile of the curve which indicates the driver loading type. If you include the bass / mid-bass response (so 50-200Hz), you can certainly notice differences between these phones. And, certainly, HD650, HD800 and LCD2 don't quite "all sound the same" in the bass/mid-bass department...