Sennheiser PC37X randomly goes bad after disconnecting the cable ?
Greetings, Yesterday I was using my headset like normal with my macbook, just listening to music and on a call with people like usual, and the headset was perfectly fine. The stock wire that came with the headset is extremely long and yesterday it annoyed me very much that it kept getting tangled with itself, so I decided to see if the cable is replaceable. I pulled out the cable from the headset and saw the adapter, and looked online for a replacement. Upon plugging it back in, the audio sounded extremely muffled and washed out. Im not sure what I did wrong to make it mess up like that as I've always taken good care of it, ive had it for about 2 years and its always just been chilling on my desk, but anywho I thought the cable just went bad and ordered a replacement. The replacement came, and the issue is still persistant, so I am not sure what the issue is I've tried multiple different headsets and the issue is not with the port, and I also tried it with my windows laptop and...
Apr 23, 2024
When I connect the odac to the computer, turn on the AMP, plug my headphones and increase the volume to the maximum , without playing any sound, I hear a very light electronic noise but really very low, and more clearly when I set the gain to 6.5 db. So I wanted to know if this is normal, because, as far as I understood, the noise should be canceled no matter what volume/gain we are using for getting a totally clean sound.
FYI, I'm using a Sennheiser HD25-1 II .
Thanks
http://www.jdslabs.com/pdf/Instructions_O2-ODAC.pdf
perhaps it's a power issue. How strong is your AC adapter and have you tried a powered USB hub? Also, are you sure you're running the amp on AC power?
http://wiki.diyfaq.org.uk/index.php?title=Wallwart#Rectified_AC
IIUC the point of using AC for the O2 is to avoid the need for "virtual ground", so maybe that means you need to plug the adapter into a grounded wall socket; are you?
Here below are its spécifications:
voltage: 15Vac max. current: 500mA dimensions: 68 x 50 x 80mm input: 230Vac / 50Hz thermal cut-off output: alternating / non-regulated short-circuit protection plug: 5.5mm / 2.1mm cord: 1.85m
It is not having a grounded plug, as the one delivered with the amp.
I think that this is fine, the only thing is that it is a non-regulated, but all the models suggested for this amp are non-regulated, even if I was reading that this could generate ripple and causes hum in some audio equipment.
More details about my problem, When I Just plug the amp to the power adapter and plug my headphones on the audio out; the hum is pretty clear with the volume set anywhere between the middle position to the max. As soon as I plug a input source on the input jack plug (without playing any sound), or if I plug the USB cable to the ODAC, the hum almost disappears and is noticed only if the volume is set to the max or the gain to 6.5 db. When no input source is pluged, and I touch the outside chassis of the O2+ODAC with my hand, the hum becomes stronger and sounds like a static electricity noise.
Do you still think it is the AC Adapter ? or could it be a bad isolation of the O2+ODAC itself ?
Haven't recieved mine yet plus I have grounded wall sockets at my current resident but, in anticipation of school starting again in about a month...
USB port of my desktop to the ODAC mini USB port. The EU power Adapter to the AC input. and my headset, Sennheiser HD25-1 II connected to the Amp output (6.3 mm jack). Just that, turn on the computer, the Amp, and when increasing the volume to the max I'm having that hum problem.
And if I connect my phone to the input 3.5 mm jack, and nothing playing, same problem, and the noise is even amplified if I disconnect the USB from the ODAC.