I plan on buying the Sennheiser HD 380 Pro for video editing, recording and general use on my computer (music and some high-end gaming) and I'm wondering if picking up a headphone amp would give me any boost in audio quality. The 380 Pro has 54 ohms of impedance, so from what I understand they should run decently on low power sources, but at 54 ohms would an amp help? The Schiit Magni caught my eye as a great little amp for someone picking up their first good setup. I will mostly be using my editing desktop which uses this motherboard which seems to have fairly good on-board audio.
Will I need an amp with Sennheiser HD 380 Pro's?
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The Sennheiser HD 380's are extremely efficient. Even though their impedance is 54 ohms, their sensitivity is 110dB. Which is comparable to some IEM's. They do not benefit hardly at all from amping in my experience.
That being said sometimes an amp is nice so you have a volume control at your fingertips.
But the Schiit Magni is an super powerful little amp. Your area of volume adjustment would be between 8:30-9:00 o' clock on the volume knob. That is if you didn't turn your source down lower.
The HD 380's are a great choice for video editing and being an all-arounder. I say get em' and don't worry about an amp.