Yeah I would say this means the squeal comes from the amplifier itself. That's good news actually. At least the problem is not on the power rails. You can still use the D7 as a DAC without issues.
I've got another newbie question, as it's my first time getting an external DAC..
After connecting the iem to the dac, is it normal to hear a 'pop' sound when switching on/off the DAC? Would it damage the iem?
I've got another newbie question, as it's my first time getting an external DAC..
After connecting the iem to the dac, is it normal to hear a 'pop' sound when switching on/off the DAC? Would it damage the iem?
That is normal. It happens with many amps to a greater or lesser degree. It will not damage your IEM's, but if it is uncomfortable, you can just plug them in after turning on your D7.
That is normal. It happens with many amps to a greater or lesser degree. It will not damage your IEM's, but if it is uncomfortable, you can just plug them in after turning on your D7.
I just got my D7 yesterday and had the same driver issues a lot of people experienced (Code 10 error..hardware not installed properly). I'm running XP Pro (SP3) on my work laptop and I couldn't get the iBasso driver to load. There is an updated driver on iBasso's website dated 4/25/12, but it's a .raf file and I couldn't get it to run either. Based on a couple suggestions in this thread, I downloaded CEntrance's driver and got my D7 to work this morning. Their driver is a self-executing file and it loaded itself without issues.
I only listened to the D7 for about a minute but it seemed to drive my HD600s pretty well on the low gain setting. I only had the volume at 1 o'clock and was getting good spl with full, controlled bass.
Looking forward to more listening...
Thanks to everyone for their help with the driver issues. All seems to be working well with CEntrance's universal driver.
I've just discovered a strange issue with my D7. Tried to search if anyone experienced something similar, but couldn't find anything...
The thing is that I've been using it for 2 months with my Senn 650, and its background noise is completely inaudible.
However, when I attach the line-out to my newly built Bottlehead Crack, the noise (most probably gathered from the PC through USB power) is quite noticable (even moving a mouse on a PC results in quiet but still audible "beeep"). I've tried with a self-powered USB hub, but the situation remained the same. And the problem is not on the Crack's side - when I short both channels with the ground on Crack - I can't hear a thing.
Now I assume I should build a USB isolator to fix this, but I'm really puzzled - how come that I don't hear such noise when using it as a DAC+AMP, but I can hear it very well when using it as a DAC only?
What if you plug headphones directly to the line out of the D7? Can you still get some noise then? You'd have to use some sensitive headphones for this test to be relevant though.
I'm using the D7 connected directly to my laptop and the line out is feeding a LD MKIII with the HD-650 plugged in and no hiss for me. Very quiet.
The background noise can come from lots of different source that is not easy to find. Tries to place the DAC differently, as far from the Crack, the PC. You should also use good audio cables (it does not mean very expensive). I think that tubes are also sensitive or they emit more electromagnetic field. I'm not sure in what sense.
Yes, I can hear the same noise by plugging-in my earbuds into the line-out.
And if I connect D7 to a laptop, there is no line-out noise, probably since the laptop's USB port is battery powered.
D7 on a self-powered USB hub, without my HTPC connected as a host - no noise. As soon as I connect the host to the USB hub, the noise is back.
All this regardless if Crack is connected or not, if RCA cables are connected or not, etc.
So it's probably due to poor power supply unit of my HTPC, or interference
Anyway, I'll order the USB isolator kit and try to fix the problem that way.
Interesting--I just updated to OSX 10.7.3, and the problem seems to be fixed, for the most part:
If I turn it off-and-on relatively close together (like 10 seconds or so) it occurs every other time, rather than every time.
If I wait a minute or so before turning it on again, then it doesn't seem to happen at all.
OSX likely reserves and tallies the amount of required current on the bus, and it takes a minute or so to expire something disconnected. This must have been broken before. I only tested waiting over a minute--it could be less, but of course we aren't turning things off-and-on like that under normal use anyway, so I'd consider it fixed...
Just want to bump this thread to say I just ordered one and am very excited. I've been loving my new Ultimate Ears Custom Reference Monitors, but the NuForce iDac2 I used them with feels like it's lacking. Too much sibilance, which it sounds like the D7 will improve upon. Can't wait!
The update I did was only from 10.7.2 to 10.7.3, so it had nothing to do with upgrading to 10.7 in general. In any case, the issue came-back just a couple days later, so the update didn't really do anything in the end, and it was apparently just a coincidence that it didn't occur for a day or so.
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