HD 558 vs HD 598 Soundstage

[crispswish]

How much more soundstage does the HD 598 have over HD 558?

 

[PurpleAngel]

They both use the same 50-Ohm drivers
The HD558 comes with black rubber tape on the inside of the cups, covers about 40% of the air holes, so if you remove the black rubber tape, you should get something close to the HD598 sound.

 

[crispswish]

They both use the same 50-Ohm drivers
The HD558 comes with black rubber tape on the inside of the cups, covers about 40% of the air holes, so if you remove the black rubber tape, you should get something close to the HD598 sound.

Thanks PurpleAngel. Does that mean the HD 558 has 40% less perceivable soundstage than the HD 598? If not, how much less (in percentage) would you say?

 

[PurpleAngel]

Thanks PurpleAngel. Does that mean the HD 558 has 40% less perceivable soundstage than the HD 598? If not, how much less (in percentage) would you say?

 
I think Sennheiser added the tape to the HD558 to make the HD558 more bassy sounding then the HD598.
Never directly compared the HD558 to HD598, so I'm at a loss for the difference in sound stage.