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They have a 1.8m cable, with a 3.5mm plug on the end, and a 6.3mm adapter included.

The cable locks into place on the headphones but is removable.

Sennheiser HD 505 and HD 600 headphones held in a man�s hand

I had the HD 600 at 90% of maximum to reach the same perceived volume level.

So sure, they’re not hard to drive, but you will need to keep your foot down.

Obviously, it’s all about the sound, though, so let’s dig in there.

Sennheiser HD 505 headphones held in a man’s hand, showing the earcup mesh

Sennheiser HD 505 headphones held in a man’s hand

Sennheiser HD 505 and HD 600 headphones on a table

Sennheiser HD 505 headphones held in a man’s hand showing the transducer

Sennheiser HD 600 -…

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Sennheiser HD 600 Open-back…

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