Intermittent, Weird Glitchy Noises
1. Cellphone or WiFi router interference. You probably have a cellphone or wifi router too close to your headphone amp or DAC. Move these devices away. No high-res audio device was designed to sit next to a device that can put out watts of gigahertz noise.
2. Bad cables, or badly shielded cables. Try different cables.
3. Computer ground noise. Ground noise can come across from some computers via the USB port. Try a cable with ferrite noise suppressors, or a powered USB hub, or Wyrd.
Hum and Noise
1. Got hum? It could be a ground loop. Try a ground loop isolator or EbTech HumX to eliminate it.
2. Got hiss and hum? High-gain, high-powered tube amps aren’t the best choice for IEMs and highly sensitive headphones. Switch to low gain mode, if available.
3. Still have noise? Tube amps are going to be more variable in terms of noise than solid-state. Some tubes will be very quiet. Some won’t. That’s why we say, “If you’re looking for certainty, go solid-state.”
Music is Distorted or Garbled
1. You may have a bad headphone adapter. Many 1/4" to 1/8" adapters aren't designed for the bizarre TRRS plugs used by headphones that have smartphone controls on them. Use a different cable to the headphone (many of them provide a regular "audio only" cable, or chose an adapter that is designed for these weird plugs.
2. Pure tube amps aren't designed to drive low-efficiency, low-impedance headphones. Trying to run orthodynamic headphones from Valhalla, or even Valhalla 2, will result in distorted music.
3. You may have bad tubes in. As tubes age, they can become more distorted and garbled. Try a new set.
Sound is Louder in One Channel
1. Channel imbalance is completely normal on all amps with very small potentiometers, (volume controls) at low listening levels. This includes Magni and Fulla. The channel imbalance should not persist above 8:00 on the volume pot.
2. If you need more adjustment range for very efficient IEMs, you can switch to low gain on amps that have a gain switch, or send 24-bit data from the computer to your DAC and reduce volume in software.
3. If you’re using a tube amp, make sure the tubes are matched. Tubes must be carefully matched to ensure channel balanced. Schiit matches its tubes to within 2.5%.
No Output (One or Both Channels)
1. If there's no output in one channel, try different cables. Cables do go bad, and with frightening regularity.
2. If there's still no output in one channel, swap the cables from the source, so they are each going into the "wrong" input (left into right, right into left). If the problem changes channels, the source is at fault.
3. If the problem doesn't change channels with a cable swap, swap the tubes to the alternate side. If the problem changes channels, you have a bad tube.
4. If you’re using Mjolnir, you may have triggered its internal protection system. This will happen if you’re using balanced to single-ended adapters for the headphones OR the preamp outs. There are NO single-ended outputs for Mjolnir, and adapters do not work.
5. Have you turned the volume control up?
6. Are your headphones plugged in?