bobeau
Headphoneus Supremus
- Joined
- Jan 15, 2005
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Just wanted to put a note out there about power to drive these... I have a Tempotec Sonata HD Pro ($40 amp/dac, $60 w/ mfi certified) that measures supremely well per ASR, and at 63 mw @ 33 ohms it drives these pretty well. At least I don't feel it's giving anything up to a mojo which was measured 410 mw @ 33 ohm (~8x the power) before clipping, which lays waste to what it seems many DAPs do on balanced. Compared to the mojo, not only does it sound similarly full, but it sounds cleaner/more incisive in the way you might expect a much better DAC to perform.
From the Sony DAPs I've seen measured there, they are very poor on the unbalanced outs, about half the amount of power as this thumb-drive type DAC, so I wonder if that is part of the reason the ZR1s are seen as hard to drive? That's similar performance to an Apple dongle (31 mw @ 33 ohms) and using mine I do hear a notable step down in audio quality.
FWIW, driving the Sonata from my iPhone I'm roughly at 33-50% of the total volume depending on the material, guestimate landing somewhere in the 82-85 dB area.
EDIT: on closer listening, I stand corrected. The mojo is definitely fuller on some tracks that I can hear. It looks like I'll be reverting to using the mojo, which I haven't used in years.
From the Sony DAPs I've seen measured there, they are very poor on the unbalanced outs, about half the amount of power as this thumb-drive type DAC, so I wonder if that is part of the reason the ZR1s are seen as hard to drive? That's similar performance to an Apple dongle (31 mw @ 33 ohms) and using mine I do hear a notable step down in audio quality.
FWIW, driving the Sonata from my iPhone I'm roughly at 33-50% of the total volume depending on the material, guestimate landing somewhere in the 82-85 dB area.
EDIT: on closer listening, I stand corrected. The mojo is definitely fuller on some tracks that I can hear. It looks like I'll be reverting to using the mojo, which I haven't used in years.
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