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*Comparison and Review* Magni/Modi vs O2/ODAC - Page 18

post #256 of 434

I love it! The alternate-universe Magni...

post #257 of 434

I'll send it on down. Wait'll you experience the alternate reality it produces.

 

 

se

post #258 of 434
Quote:
Originally Posted by Steve Eddy View Post

Quote:
Originally Posted by Jason Stoddard View Post

It's simply the quiescent current in the output stage--in the case of Magni, about 30mA--hardly enough to really get warm. P= IV, where I is .03 and V is 30V--so it dissipates about 2W at idle from 2 channels. I forgot the actual FLIR numbers, but it runs something like 27C in a 20C room.

 

Don't forget the regulators. biggrin.gif

 

After a 30 minute warmup (and measuring immediately after removing the top cover), the regulator cases were running around 140F (60C) and the output devices around 150F (66C). That's enough to make the top cover feel warm, but certainly not hot.

 

Top cover with Magni off was 72F. After idling for about 30 minutes, it rose to about 84F. Warm to the touch, but not even body temperature. So no reason for anybody to fret.

 

Oh yeah, while you're here, my Magni has a problem. Whenever I turn the knob all the way to the left, I get no sound. What's up with that? Can I get a new one? tongue.gif

 

Have a great weekend, Jason!

 

se

Doesn't that happen with most amplifiers? Maybe not...my lack of experience is getting to me isn't it? XD

I always thought the volume knob is supposed to go from volume 0 to volume max.

post #259 of 434
Quote:
Originally Posted by Jason Stoddard View Post

 

Yeah, I've heard of that problem. About 99.8% of the Magnis have it, unfortunately. I've heard it's a relatively common problem with other amps.

 

Despite that, we'll put our entire engineering team on it and see if we can develop a fix. I believe Dave (our DSP and microcontroller wizard) could probably work up a PIC-based control system that would, say, allow you to get full volume at the touch of a button even with the pot fully to the left. Of course, that may not be the best solution, unless you want a special "destroy my headphones" function.

 

(Actually, the first preamp I designed for Sumo had the pot wired backwards on the prototype PCBs. So, in that case, you'd have plenty of output at full left, especially with 20dB gain and +/-35V rails. Hello, voice coils.)

Jason, I am proud to be your customer :D

post #260 of 434
Quote:
Originally Posted by Steve Eddy View Post

I'll send it on down. Wait'll you experience the alternate reality it produces.

 

 

se

 

post #261 of 434
Quote:
Originally Posted by miceblue View Post

Doesn't that happen with most amplifiers? Maybe not...my lack of experience is getting to me isn't it? XD

I always thought the volume knob is supposed to go from volume 0 to volume max.


 Was only having a little fun is all.

 

se

post #262 of 434

You see Steve...what you have started.....there is always someone that will take the bait....I actually rewired my volume pot with heavier gauge wire and the volume is back to normal....wonder if that will make the specs and better now between the ground and center tap?

 

Alex

post #263 of 434

Guess I'll just get the Schiit since it's cheaper smile.gif


Edited by Mheat122134 - 1/20/13 at 4:03pm
post #264 of 434
Quote:
Originally Posted by adydula View Post

You see Steve...what you have started.....there is always someone that will take the bait....I actually rewired my volume pot with heavier gauge wire and the volume is back to normal....wonder if that will make the specs and better now between the ground and center tap?

 

Huh? What? What'd I say? Oh, look! An eagle! ph34r.gif

 

se

post #265 of 434
Quote:
Originally Posted by Mheat122134 View Post

Guess I'll just get the Schiit since it's cheaper smile.gif

 

Cheaper? No no, "less expensive." biggrin.gif

 

se

post #266 of 434

I really do have to appreciate how nice the Schiit Stack looks next to the O_O combo. The Schiit Stack has that kind of alluring Apple-look, whereas the O_O combo has a more conservative look with an ugly cable mess in the front.

Mac vs PC anyone?

Just kidding.

post #267 of 434

Gotta hand it to Schiit, these boxes look great!

 

One thing bothers me about the OP's [awesome] review: the O2 and Standalone ODAC are not meant to be stacked, as they're a cabling disaster this way. The real O2+ODAC combo has a far more orderly appearance since it's assembled in a single box. I've only skimmed through these 18 pages--hope this hasn't already been pointed this out.

 

 

Quote:
Originally Posted by miceblue View Post

I really do have to appreciate how nice the Schiit Stack looks next to the O_O combo. The Schiit Stack has that kind of alluring Apple-look, whereas the O_O combo has a more conservative look with an ugly cable mess in the front.

Mac vs PC anyone?

Just kidding.

Reply
post #268 of 434
Thread Starter 

Stacked or not, you still get a mess of cables in the front.  Notice that my ODAC is turned backwards-- I'm not a complete masochist.  Arguing over camera angle bias would have been a better approach though, as I cleverly hid the cables behind the Schiit stack and not so for the Objective combo.  tongue.gif

post #269 of 434
Quote:
Originally Posted by jseaber View Post

Gotta hand it to Schiit, these boxes look great!

 

One thing bothers me about the OP's [awesome] review: the O2 and Standalone ODAC are not meant to be stacked, as they're a cabling disaster this way. The real O2+ODAC combo has a far more orderly appearance since it's assembled in a single box. I've only skimmed through these 18 pages--hope this hasn't already been pointed this out.

 

Quote:
Originally Posted by TMRaven View Post

Stacked or not, you still get a mess of cables in the front.

 

 

Sounds like someone should design a desktop version of the O2, with just the headphone jack on the front and the rest of the cables on the back.  They could even call it the "Objective Desktop Amp" or something...

 

Seriously though, does JDSlabs have any updates on what's up with that guy and whether he's made any more progress on the ODA?

 

 

post #270 of 434

I don't believe the Magni has more power than the O2.

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