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
- XMOS X200 USB streaming controller operating in asynchronous transfer mode.
- IDT XLH series oscillators provide and exceptionally stable and low noise sample clock for DAC. 12kHz to 20MHz phase jitter is 750fs. Note that the jitter below 12kHz is generally more important in audio applications but the 12kHz-20MHz specification is commonly used for specifying oscillators so it is useful in comparing to other clocks. In the SDAC the clock jitter artifacts are well below the DAC noise floor so they are essentially irrelevant.
- AK4452 DAC provides 32 bit internal processing , 115dB dynamic range, and the same architecture as the AK4490.
- Output amplifiers are Burr Brown OPA1652. These are extremely low noise low distortion FET input amplifiers with excellent output cable drive capability. Note that the output impedance is set at 150 Ohms so the SDAC is not intended to drive headphones. While it will not harm anything to do so, the fidelity will not approach what is possible with a good headphone amplifier.
- The negative audio power supply is generated with a switched capacitor circuit that operates synchronously to the audio sample rate to eliminate any possibility of power supply related spurs in the output spectrum.
- DAC power supply is regulated with the TPS793 low noise linear regulator to reject any contamination from noisy USB power.
- 4 layer FR-4 circuit board with careful attention to high speed digital layout, power supply grounding, and low noise analog signal routing.
I will attempt to upload a fft plot showing the SDAC passing a 10kHz sine wave. Notice that there are no visible jitter sidebands (spurs that appear evenly spaced on either side of the fundamental tone). The line at 20kHz is the first harmonic at -92dB. The level of the noise floor suggests that the upper limit of random jitter in the SDAC clock is around 1.5ps at any given frequency. If anyone has questions let me know. I will try to check in here as time permits... Cheers, MichaelSo I'll go with this drop!