Sennheiser HD555 Break in?
Aug 10, 2009 at 1:20 PM Post #2 of 4
I am not sure about optimal, but I noticed substantial improvements with around 150-200 hours on them. I probably have about 500 hours on them now and occasionally run them out of my Darkvoice 336se. I have since moved on to many other headphones, but I am always pleasantly surprised by how they sound now.
 
Aug 12, 2009 at 9:00 AM Post #4 of 4
Personally I haven't found any huge improvements in the 555/595 beyond about 20 hours. It's the 650 that seems to need several hundred hours to reach critical mass.
 

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