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YavorMoskov
50
Dec 13, 2015
My unit is finally working. At some point today it started to reboot itself without my interference for 10 or 15 munutes over and over and when it stopped I tried it and there was a sound! And still is. I expected the amp section to be a little more powerful. It feels like my Fiio E10-K has more power. In order to have sufficient power to my Philips Fidelio L2 I had to crank up the volume to 75. Other than that I am happy with the sound.
MassEDU
182
Dec 14, 2015
YavorMoskovIt's a self-troubleshooting DAC/Amp too?! What's it going to surprise us by doing next, our laundry? Jokes aside, glad to hear it's now working for you. In "low power" mode, the m9XX has roughly the same output power as the E10K, which is already a decent amount. Use the m9XX in "high power" mode (with power supply plugged), and it's not even close. For your L2, low-power mode should be more than enough and even at 75, you could go all the way up to 90. In high power mode, you can go 90-99. A lot of power on tap now and for the future. I recommend you read the manual if you haven't, it's well-written. Enjoy!
CalebRoberts
56
Dec 14, 2015
YavorMoskovHi YavorMoskov, From your description, it sounds like one of two possibilities: 1: Insufficient current available from your USB host port (computer) or from the power supply that is connected to the 5V/2A connector. In many cases, there's only 500mA available from the root hub so if you have any other devices connected to the same root hub, they may be drawing too much power. Too much current draw will cause the power supply to drop. Behavior of devices will be unpredictable. Besides the possibility of other devices drawing current on the same root hub, it's possible that the port simply doesn't supply the required 500mA - whether it's non-compliant or perhaps damaged.
When m9xx first boots, it consumes about 150mA. After about 6 seconds the audio circuit's power supply is fully powered-up and the m9xx draws >300mA. If the power supply can't keep up then the m9xx may shut-down completely or it may shut-down and attempt to restart the audio circuit's power supply. This will depend on how quickly the host power source drops (and recovers).
Important - do not connect the 5V/2A port to a computer USB port. The computer's USB port probably can't supply current greater than 500mA. Note that when a power source is connected to the 5V/2A port, the audio circuit's power supply starts up sooner - after about 2 seconds. Perhaps you've plugged the 5V/2A connector into a computer USB port or some other USB power supply that can't deliver sufficient current?
If any of these faults are occurring, the audio circuit's power supply will be off and thus no sound.
2: A short-circuit present at the headphone output. Any chance your headphones have a damaged cable resulting in an intermittent short - or perhaps the plug wasn't fully inserted? A short circuit on the headphone output when there is signal present will likely cause an over-current condition and the audio circuit's power supply will shut down. "OC" is then displayed temporarily. This can occur when plugging or unplugging headphones when signal is present.
OC condition when a power source is connected to the 5V/2A input often results in the m9xx re-booting because input voltage usually drops too quickly.
Note - when set to 75, you're operating at 24.5dB below the maximum output level. It would be no surprise if 75 is too low a setting - depending on the sensitivity of your headphones.
I hope this info is helpful.
ehmora
8
Dec 15, 2015
YavorMoskovI was at 85 in high power mode with K7xx
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