DJ_Nuck_ChorrisHigher impedance means less feedback with the amplifier, which can mess up the frequency response if the impedance/frequency of the headphones isn't flat. Or at least that's what I've read.
DJ_Nuck_ChorrisThe higher impedance is usually a result of stronger / bigger magnets. Higher impedance means more voltage is required to drive the magnets, thus involving the need for an amplifier. The advantage of this is better accuracy when pushing the driver out since there is a wider voltage band to define amplitude of the sound wave. Conversely, the stronger magnets result in a quicker return to centre for the driver which means even greater accuracy for high frequencies. More powerful drivers also mean you can employ the use of robust diaphragm materials that are less prone to micro distortions while vibrating. This is for the most part why people prefer higher impedance headphones. That's not to say that lower impedance drivers are inherently worse. There are high fidelity drivers sub 6o ohm that perform just as well as high impedance counter parts. It's all dependent in the technology, design, and construction involved that define the kind of frequency response and accuracy headphone drivers can achieve.
JustawaySeriously. I got the hifiman 350s in and I love the since I changed the pads. However, I can’t listen to them on my jotunheim. Way too much feedback with the lower ohms. Can’t hear it with music laying but I always know it’s there. Waiting.... watching.... listening..... for me to hit pause on my tracks
Aech661The ohm rating shouldn't have much of anything to do with the hearing the noise floor of an amplifier. Sensitivity will impact this much more, if you are getting noise on the Jotunheim with the HE350's you more than likely have another issue like ground loop going on. Try disconnecting your source from the Jotunheim and see if you still get the hum/noise.
ElectronicVicesI’ve tried disconnecting everything and reconnecting It all. The 350s and mx50s are literally the only ones that I get and feedback from Because they are both under 50 ohms.
All of my headphones that are 300ohms or more don’t get any feedback, even on high gain at max volume.
Aech661Separate outlets may help, also try disconnecting the source and listening again on just the jotunheim (slowly raising volume if you can't hear the noise initially). If the noise disappears when the Jotunheim is not connected to other devices (besides your phones) you most likely have a ground loop issue. If you are using your PC as a source you could also have some noise from the USB. You could also try listening to test tones, if the noise mimics a 120Hz tone it's more than likely a ground loop, if it's a lower 60hz tone it could be power noise or EMI/bad shielding on your cabling.
Edit for Link: https://www.psaudio.com/ps_how/how-to-find-and-fix-hum/
ElectronicVicesAha figured it out. The ground loop Is coming from my headphones with a 3.5 mm Jack and are running through an adapter to my 1/4 in out. This is why all headphones should just have a 1/4 inch jack. Egh
Aech661I've had issues with bad 1/4' adapters (from the factory) in the past. A pair of Fidelio X2's I have were almost sent back, the in box adapter created a good 6db or more channel imbalance. I just happened to try them with my 3.5mm sources before requesting RMA and boom problem solved. Tried the adapter again, same issue, so I tossed it and borrowed one from my other headphones. Both Grado and Sennheiser make reasonably priced 3.5mm to 6.3mm (1/4") adapters if you are looking to pick up a replacement.