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Schiit Mjolnir headphone amplifier - Page 214

post #3196 of 3200
Quote:
Originally Posted by johnjen View Post
 

I realize you are located in Europe and so you have a different wiring scheme.

 

But I would also assume that you use 3 wires to connect power to the Mojo amp and the rest of your audio gear.

Now if this isn't the case and you use only 2 wires to connect to your ac power, then this may not work.

BUT if you run a separate ground wire to a source of outside ground (like a cold water pipe etc.) this is the 'source' of the ground used in the system.

 

As a TEST try unconnecting the ground connection at the Mojo, and see if the hum goes away.

IOW you may be grounded twice, which can cause hum due to a ground loop.

 

BE AWARE that by lifting the ground on the chassis, it MAY become a source of a shock by touching the chassis.

If this happens pull the plug out and re-connect the ground.

And if you are adventurous (and feel confident to do this) you can try this on other equipment in the audio chain, but be aware the same caution applies about being a potential shock hazard.

 

Now if it makes you uncomfortable in trying this, then don't and get an electrician or somebody you know who is 'handy' with electricity to help you with this. 

 

But ground loops are usually solvable

 

Does this answer your question?

 

JJ

Ahhhh, I used a non-grounded wall socket for my Mjolnir and now it's quiet again :)

 

Thanks for pointing me in the right direction!!

 

G-J

post #3197 of 3200

Thanks for all the helpful info here. Trying to decide on a headamp and interested in the Mjolnir, as well as the Audio GD Master 9, and less so the Oppo HA-1.

 

As far as HP, I'm in the midst of deciding between the LCD-3 and the LCD-X (I'll only keep one).

 

As of now, I have the Oppo 105D which I plan to keep for HT/universal disc/and as a pre for my system, and the Phonitor 2 that I just received a couple weeks ago that remains unopened as I plan to sell it since it does not fit into my overall set up with our 2 channel/HT 7.1 system.

 

I was considering the Oppo HA-1, especially if I go with the LCD-X since it is easier to drive vs. the 3, but the Mjolnir and Master 9 have caught my eye based on price and reviews.

 

Has anyone paired the Mjolnir with the Oppo 105D? My thought is that I may do this at least initially to see how it sounds with the 105D DAC and to use with CDs until I have time to rip them all. If there is a significantly better DAC to pair it with as far as SQ, then I could consider picking that up at a later date. I had been looking at the Hugo given it's reviews and size, but am unsure it's worth adding a DAC to the 105D. 

 

Can anyone comment on the Mjolnir vs. Master 9 for SQ, especially with either the LCD-X or 3?

 

Any reason that I would have issues (e.g. SQ degradation, connectivity) having the Mjolnir and 105D connected via XLR and then run a pair of XLR from the Mjolnir to my monoblocks for 2 channel listening, and connect the RCAs from the 105D to my 5 ch amp for 7.1?

 

Thanks

post #3198 of 3200

I have really bad mains quality which affects all of my kit and I'm slowly going off the grid, with just the amplifier left to go.  I'm looking at options such as RWA and Bakoon, but I'd really be interested to know if I could bypass parts of the Mojo's power circuitry and feed it directly from a 12v battery.  Does anyone know if that's feasible?

 

I'd most likely get an expert to make the changes, but there's no point starting that conversation if the circuit is inherently unsuitable.

post #3199 of 3200

Why not just go to a UPS system which would supply a constant current and voltage supply at all times? Personally I would never get into modifying internal circuitry in any electronics device when a much easier and effective solution is available by utiling an uninterruptible power supply (UPS) which is widely available being used for years for computer equipment.

post #3200 of 3200
Quote:
Originally Posted by commtrd View Post
 

Why not just go to a UPS system which would supply a constant current and voltage supply at all times? Personally I would never get into modifying internal circuitry in any electronics device when a much easier and effective solution is available by utiling an uninterruptible power supply (UPS) which is widely available being used for years for computer equipment.

 

I've tried using an online UPS, which was completely consistent, but the sound quality didn't meet my needs (HD800s are rather demanding).  I've also tried filters, balanced transformers and a variety of other stuff, most of which brought significant improvements but I've never reached 100% unless it was 2am.  I do occasionally get flashes of brilliance at other times though, for example when England were playing in the World Cup, as I guess all my neighbours went to the pub to watch it instead of messing up my power supply!  Sadly, that didn't last very long... :rolleyes: 

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