What did I do wrong? (8 Ohm Amp on 250 Ohm Headphone?)
5 hours ago, Hawkins said:What do I miss by using this combination?
I have a MSI Z87 MPOWER Motherboard without any Software from Creative (just Realtek's 6.0.1.8004 Software for the ALC1150 Codec)
https://de.msi.com/Motherboard/Z87-MPOWER.html
Connected directly into my NAD302 Ampifier on the front "phones" port...
https://www.hifiengine.com/manual_library/nad/302.shtml
... are my brand new Beyerdynamic DT990 250 Ohms
https://viva-telecom.org/SHOP/FILES/BEYERDYNAMIC/dt-990-pro-rp.pdf
4
Power amplifiers don't typically amplify the sound that comes out of their phones jack. It's there to monitor your input before you send it out to the speakers. The headphone output is at line level, so it isn't driven at all by the coils inside. That output is actually 220 Ohm, after looking at the manual for a NAD 302 (https://www.manualslib.com/manual/363734/Nad-302.html?page=5#manual)
As others have suggested, you should look into a dedicated headphone amp.
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