I want to buy sennheiser hd 558 but I don't use external sound card, I use iPod and MacBook for listening. 558 is 50 ohm. I'm not sure it completely sounds perfectly with iPod and MacBook or not!
Could you help me??
I would think it would work decently with an iPod or Macbook.
But it might be better if you swap the cable for one comes standard with the 3.5mm plug ($16-$19)
The HD558 comes with a 1/4" female to 1/8" male adapter, but swaping the cable makes things easier.
This link will explain the differences between the Beyerdynamic headphones.
Headphones that 50-Ohm or less, would be better a choice for use with an iPod.
The HD558 is about 55 ohms but creeps up to about 300 around resonance (90 Hz). Still, I think you should be fine with an iPod in general.
One thing I noticed about that cable is that it's 3 connector 2.5mm on the headphone side, while the original HD558 is 4 connector 2.5mm. Not sure if it matters though.
On the other hand, the original HD558 cable is about 0.9 ohms which puts it a little north of where I feel it should be. The cable upgrade seems reasonably priced and might make things better... 4mm 1.8m should be around 0.01 ohm... Hell I might try it my self!
I bought the same cable for use with my HD558, it works fine.
The extra channel (connection) on the stock HD558 cable is not used,