My current audio interface has a maximum of 250 ohms. Can I still use the HD600 with it and if so, what are the consequences of the difference in impedance? Does the output merely become quieter or does it effectively affect the sound quality? Thank you very much in advance :)

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Bonjour, 
Vous pourrez très certainement utiliser le HD 600 à bon volume, mais il y aura peut-être (suivant la qualité de votre interface audio) un son moins complet / dynamique (notamment dans les basses fréquences) comparé à des amplis DAC conçus pour des impédances hautes (au-delà de 300 ohms). However, in my opinion, there's no reason to worry about it working; it's a case that makes the basses sound too low.

traduction deepl pour l'allemand :
Hello, 
You can certainly use the HD 600 at a good volume, but it may (depending on the quality of your audio interface) have a less full/dynamic sound (especially in the low frequencies) compared to DAC amplifiers designed for high impedances (over 300 ohms). However, in my opinion it is not a problem to use the headphones as they do not reproduce much bass anyway.

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Please, you should contact the Sennheiser Support and ask the same question:
https://www.sennheiser.com/en-us/support

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Question about Sennheiser HD 600

My current audio interface has a maximum of 250 ohms. Can I still use the HD600 with it and if so, what are the consequences of the difference in impedance? Does the output merely become quieter or does it effectively affect the sound quality? Thank you very much in advance :)