Originally Posted by Veniogenesis
I remember the PortaPros use the same drivers as the KSC-35. Or maybe my memory is faulty.
It is the same driver. Only difference is the porta-pro has a gold plated plug and blue plastic instead of black. The Porta-Pro headband attaches the same way as the clips so they are interchangeable. The headband and the clip sound different due to how the driver sits on your ear. If you are looking for a bassy KSC-35, get a Porta-Pro. It is similar, but since the headband pushes the driver to your ear you get a lot more bass.
I'm not so sure the KSC-75 sounds much different than the 35. Same as above, the way the clip connects to your ear will have a significant affect on the sound and I find the 35 clip to fit the drivers closer to my ears. When I switched drivers using the same clips there wasn't a huge difference between the 35 and 75 drivers.
In response to the reliability comment, I have had two drivers develop a buzz in the last few years I've enjoyed the 35. But I have had that happen to Grados and AKGs as well. Headphone drivers are fragile any way you look at it. Otherwise, the design is relatively sturdy if you take decent care of them. IMO the KSC-35 competes with any portable headphone under $100 out there.