When auditioning the 680s I found the sound really flat and dull compared to other lower impedance headphones, but only when driven direct from the laptop. My problems came in the form of sound quality. Generally, the most obvious issue with high impedance headphones is a lack of volume, but that wasn’t where had trouble. It drives my 35 ohm Audio-Technica AD900s quite well and is reasonable with my 64 ohm HiFi-Man Re0s, but it struggles mightily with the 680s. My laptop is a Sony Vaio C-series with a Realtek HD onboard soundcard – not bad, but also not highly amplified. I’m going to call it the X-Fi HD for the rest of this post because it’s quicker and easier.Ĭreative designed this to match up with medium-high impedance audiophile headphones and I bought it to drive a set of Ultrasone HFI 680 headphones which are moderate impedance at 75 ohm and stretched the capabilities of my laptop. It’s also known as the X-Fi HD in other parts of the world. This little beast is the Creative Digital Music Premium HD (in Australia).
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