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Schiit Mjolnir headphone amplifier - Page 95

post #1411 of 3207

I'm not sure what you mean by a balanced headphone but if the cable's terminated to SE, then an SE to balanced is not advised. That's what I've read over the years.

Quote:
Originally Posted by grokit View Post

 

The HE6 comes with a 4-pin balanced XLR termination and a single-ended TRS adapter, which is what people seem to be saying will shut down/blow up the Mjolnir. My opinion is that it will work just fine, as it is a balanced headphone first and foremost.

post #1412 of 3207

A balanced headphone has two wires going to each driver, even if it is terminated with a TRS plug all you have to do is change the plug for balanced operation. It's the ones with a common ground (3 wires total) that you have to watch out for.

post #1413 of 3207

The reason for no SE adapters is because you'd be shorting two active outputs, triggering the internal protection.

post #1414 of 3207

popcorn.gif

post #1415 of 3207
Quote:
Originally Posted by Chris J View Post


Do you drive the Mojo Balanced or Single Ended?

 

Single-ended, from my Devilsound Audio Cable, the DAC.

 

If I push the volume past 11 o'clock a typical background noise, more or less a plain white noise, starts to rise rapidly (less so with the DAC unplugged) -- but that is heads and shoulders above any normal listening levels. I repeat, I am using the problematically sensitive Denon 2000's here.

 

Below 11 o'clock, there is a static background noise on an [i]extremely low[/i] level. Double-checking right now, I find to my honest surprise that the background noise is actually higher than the noise of my wondrously musical phone. This was not the case in my initial testing, in another location, with the dented unit I first got.

 

But, in addition to this and in spite of a 230 => 230 isolation transformer, there is sometimes also a sort of whirring noise. Before the isolation transformer was put into work, this came from one of the channels and at a disturbingly high level. With the isolation transformer, this now comes from both channels and at a fraction of the earlier level. Sometimes a little louder, sometimes completely disappearing.

 

In the coming weekend, I'll try to take this unit and the isolation transformer back to the first location and see what I find.

post #1416 of 3207

Re: noise on the Mjolnir, here's what I learned the hard way.

 

For a few days I stacked my Schiit on a scheelph (shelf) with less than an inch of space above the Mjolnir. After three hours listening, on two warm evenings, there was noise in both channels sounding a bit like a 60-cycle hum.  Finally it was obvious, lack of ventilation leading to overheating.

 

Gave the amp more breathing room, and silence was restored.

post #1417 of 3207

My Mjolnir full on 100% had ZERO NONE NADA noise and I do nothing fancy other than a Monster power bar and Quail hospital grade, read $6, power cables with the W4S DAC-2 connected.

post #1418 of 3207

Noiseless here as well, and I use the power cables that came with the boxes. 

post #1419 of 3207
Quote:
Originally Posted by 45longcolt View Post

Re: noise on the Mjolnir, here's what I learned the hard way.

 

For a few days I stacked my Schiit on a scheelph (shelf) with less than an inch of space above the Mjolnir. After three hours listening, on two warm evenings, there was noise in both channels sounding a bit like a 60-cycle hum.  Finally it was obvious, lack of ventilation leading to overheating.

 

Gave the amp more breathing room, and silence was restored.

 

How hot would you say the Mjolnir was by then? How hot does it run now? 'Cause I keep hearing how this Schiit runs hot, but my amp doesn't feel hot to me. It takes at least two hours before it's on a steady temperature... which, indeed, have lead me to partially block the vents with the manual until it's warm. This could be the culprit, come to think of it. But I still can't see how anyone would call this hot. I guess I'm hunting down a thermometer now.

post #1420 of 3207
Quote:
Originally Posted by O8h7w View Post

 

How hot would you say the Mjolnir was by then? How hot does it run now? 'Cause I keep hearing how this Schiit runs hot, but my amp doesn't feel hot to me. It takes at least two hours before it's on a steady temperature... which, indeed, have lead me to partially block the vents with the manual until it's warm. This could be the culprit, come to think of it. But I still can't see how anyone would call this hot. I guess I'm hunting down a thermometer now.

I wanted to know how warm it got as well. Mine hasn't gotten hot ever, never turned off in a week so far. It's warm, but not toasty.

post #1421 of 3207
Quote:
Originally Posted by O8h7w View Post

It takes at least two hours before it's on a steady temperature... which, indeed, have lead me to partially block the vents with the manual until it's warm.

 

The heat is generated from the bottom and has to wrap around to heat up.  Mine stabilized after about 24 hours, maybe more.  Once fully stable it's about the same as a B22 or Peak.

post #1422 of 3207

FWIW the large, flat footprint suggests it would be easy to keep cool. Large area to distribute heat over (conduction); efficient ventilation (convection).

 

That said, there needs to be somewhere for the hot air to escape to.

 

Any more Gungnir/Mjolnir impressions?

post #1423 of 3207

120 F on the bottom hottest spot---115 F at the top vents on mine---On for a week straight

 

GUNGIR sitting underneath

 

jack


Edited by jackiedh - 10/2/12 at 3:18pm
post #1424 of 3207

Mine came in today...this thing is beautiful and massive.  I feel like I could kill a home intruder with this thing if necessary.  It's well made, solid, and currently being drooled over as I try to find the best place on my desk for it.

 

I think I need a bigger desk.  Especially if I am planning on adding the Gungnir to the setup.

 

The poor little Lyr looks meak in comparison to it.  The Lyr still has those sexy tubes sticking out of the top of it though.  It does have that. :)

post #1425 of 3207

Cause of death? Thor's hammer to the head, whump!

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