Order a 4556 from Digi-key.  Installed.  Pretty sure it's driving my low-Z cans more cleanly at high levels.  I still recommend an amp (or a card with more cajones at the output), but this is better.

Didn't see any discussion on this topic: I'm driving the Fidelio X1 "barefoot" (no amp) with a DSX.  I have the opposite problem that most people have.  Instead of lacking the voltage swing to drive 600 ohm cans, I'm lacking the current to properly drive these 32 ohm cans.  Don't tell me how...

7506: 12 years.  V6: 11 years.  Both have required a pad replacement.

With some EQ, the bass will vibrate your brain.  They go deep but you have to compensate for the rolloff to make the bass really shine.

It's both.  I'm listening to breakbeat right now, in fact.   The graphs show a gentle low-end rolloff and I believe them.  With no EQ, the X1 bass is not pronounced.  I wouldn't say that it's deficient, just that it's not too exciting.  A basshead wouldn't like it, I don't think.  My V6 and...

  Confirming.  Mine were a hot mess out of the box.  "What did I just get myself into?" was my first impression.  After five days, bliss.

I took the 7506's to work so I can no longer compare them. I'm still amazed at how much power it takes to drive these old cans compared to the fresh V6's. Does driving a 'phone hard for years weaken the magnets or something? For quite some time, these 7506's were inadvertently plugged in...

Follow up... I don't have any test equipment here but I suspect that my 7506's have a higher impedance than the V6 here. With a headphone Y adapter, I can plug in the 7506's without affecting the volume of the V6 much. Plugging in the V6 pulls the 7506's SPL down significantly. I'm driving...

I have a well-pounded-on 3-year-old set of 7506's here that sound very different from the 15-minute-old V6's I have on my head right now. Two things come to mind... First, the new V6's are significantly louder. Second, they have a hump in their mid and upper bass response that's so...