I know Chords Mojo is on Amirs ToDo list, but I have decided to publish my measurements as another data point to compare our two measurement systems for consistency.
The Mojo is a well known and regarded unit, its in a small and robust aluminium case with usb, optical and electrical SPDIF inputs. It has 2 3.5mm headphone outputs and funky (read odd) power and volume control balls which change colour. The unit has a rechargeable battery as it is in essence a portable unit. A second usb input is used for powering and recharging the unit. Personally I find the idea of strapping this to your mobile phone is odd (just use the phones headphone output, it really is good enough for mobile use) and the battery just a long term maintenance liability.
The unit is different from most DACs as it doesnt employ an off the shelf DAC chip but utilises an FPGA to deliver a reconstruction filter with a very high number of taps and has discrete DA conversion. The designer says thats good, but also says other things that make me quizically raise one eyebrow.
The Mojo can be found on Amazon for around $570 USD
https://www.amazon.com/Electronics-ultimate-Headphone-Amplifier-Coaxial/dp/B016W1X94O
0dBFS - Output volume is set to 2V RMS. Note I have utlised the input attenuator on the QA401 to minimise its harmonic distortion contribution. The side effect of doing so means the noise floor rises slightly. Disengaged it is approximately -130dbFS (32k point FFT).
Low harmonic distortion is exhibited however there are two odd spuria at 10 and 12kHz.
-6dBFS
-60dBFS - Low noise floor
-90.31dBFS 24 bit waveform - pretty clean / low noise but some very low frequency fluctuation noted
Jitter - There is no jitter of significance.
IMD SMPTE - Nice and clean
FR and Imaging - Sharp anti image filter and good suppression
Linearity - Extremely good
I havent tested with headphone loads, just as it would be used as a line level source with the QA401 high imput impedance. I wouldnt hesitate to use this DAC as a primary source in a full system despite its portable pretensions. It measures very well.
Im always very cautious when offering subjective impressions, but IMO this DAC does sound a little bit different to most. I find most DACs boringly similar despite what some say. I dont think I hear more with this DAC than any other good DAC, but this has a slightly different tonality. It is my "daily driver" used with Oppo PM1 cans. Oh yeah, it goes loud!
The Mojo is a well known and regarded unit, its in a small and robust aluminium case with usb, optical and electrical SPDIF inputs. It has 2 3.5mm headphone outputs and funky (read odd) power and volume control balls which change colour. The unit has a rechargeable battery as it is in essence a portable unit. A second usb input is used for powering and recharging the unit. Personally I find the idea of strapping this to your mobile phone is odd (just use the phones headphone output, it really is good enough for mobile use) and the battery just a long term maintenance liability.
The unit is different from most DACs as it doesnt employ an off the shelf DAC chip but utilises an FPGA to deliver a reconstruction filter with a very high number of taps and has discrete DA conversion. The designer says thats good, but also says other things that make me quizically raise one eyebrow.
The Mojo can be found on Amazon for around $570 USD
https://www.amazon.com/Electronics-ultimate-Headphone-Amplifier-Coaxial/dp/B016W1X94O
0dBFS - Output volume is set to 2V RMS. Note I have utlised the input attenuator on the QA401 to minimise its harmonic distortion contribution. The side effect of doing so means the noise floor rises slightly. Disengaged it is approximately -130dbFS (32k point FFT).
Low harmonic distortion is exhibited however there are two odd spuria at 10 and 12kHz.
-6dBFS
-60dBFS - Low noise floor
-90.31dBFS 24 bit waveform - pretty clean / low noise but some very low frequency fluctuation noted
Jitter - There is no jitter of significance.
IMD SMPTE - Nice and clean
FR and Imaging - Sharp anti image filter and good suppression
Linearity - Extremely good
I havent tested with headphone loads, just as it would be used as a line level source with the QA401 high imput impedance. I wouldnt hesitate to use this DAC as a primary source in a full system despite its portable pretensions. It measures very well.
Im always very cautious when offering subjective impressions, but IMO this DAC does sound a little bit different to most. I find most DACs boringly similar despite what some say. I dont think I hear more with this DAC than any other good DAC, but this has a slightly different tonality. It is my "daily driver" used with Oppo PM1 cans. Oh yeah, it goes loud!
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