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I've been playing music through a Chord Mojo in to Sennheiser HD700's for a couple months. I recently needed to provide sound in another room, so bought a pair of HD 600's and a Fiio K3.
I was originally displeased with the sound of the 600/K3, so I started EQing it with eqAPO. I then became concerned that the USB-powered K3 would not be able to handle the bass boost I prefer. I discovered that Room Eq Wizard could do distortion tests, and just completed some quick tests comparing the Mojo and K3 powering the HD 700's (I assume they are harder to drive than the HD 600's, but will test more).
Although the K3 can only drive the HD 700's to a peak (per the REW test output level pink? noise) of 90 dB, and the Mojo can do at least 99 dB, I was surprised to find that distortion levels from 20-100 Hz are within a few percent. (FYI-I listen to music at 15 dB lower than that 90 dB output).
Take these numbers with a few grains of salt. They were obtained with the tip of a UMIK-1 mic 1/8" from the center of the fabric cover inside the earcup of the HD 700. The numbers are the greatest percent seen between 20 Hz and 35 Hz, as listed in the REW distortion screen.
At a measured output of 89 dB, the Mojo's largest 2nd harmonic was 11.2%. The K3 was 10.1%
At 79 dB, the Mojo was 3.8%, the K3 was 7.9%. I'm not sure if those levels of distortion are perceivable. They were 20+ dB down from the fundamental.
So, at first test, the K3 seems fully able to drive high-impedance HD 600/700's to reasonably loud levels without difficulty.
I welcome feedback on how my admittedly simple testing may be horribly flawed, leading to non-meaningful results.
As far as listening goes, the K3 seems to be fine, although I need to work on the fitment of the HD 600's, and further eq changes.
I was originally displeased with the sound of the 600/K3, so I started EQing it with eqAPO. I then became concerned that the USB-powered K3 would not be able to handle the bass boost I prefer. I discovered that Room Eq Wizard could do distortion tests, and just completed some quick tests comparing the Mojo and K3 powering the HD 700's (I assume they are harder to drive than the HD 600's, but will test more).
Although the K3 can only drive the HD 700's to a peak (per the REW test output level pink? noise) of 90 dB, and the Mojo can do at least 99 dB, I was surprised to find that distortion levels from 20-100 Hz are within a few percent. (FYI-I listen to music at 15 dB lower than that 90 dB output).
Take these numbers with a few grains of salt. They were obtained with the tip of a UMIK-1 mic 1/8" from the center of the fabric cover inside the earcup of the HD 700. The numbers are the greatest percent seen between 20 Hz and 35 Hz, as listed in the REW distortion screen.
At a measured output of 89 dB, the Mojo's largest 2nd harmonic was 11.2%. The K3 was 10.1%
At 79 dB, the Mojo was 3.8%, the K3 was 7.9%. I'm not sure if those levels of distortion are perceivable. They were 20+ dB down from the fundamental.
So, at first test, the K3 seems fully able to drive high-impedance HD 600/700's to reasonably loud levels without difficulty.
I welcome feedback on how my admittedly simple testing may be horribly flawed, leading to non-meaningful results.
As far as listening goes, the K3 seems to be fine, although I need to work on the fitment of the HD 600's, and further eq changes.
