03-06-2009, 02:19 AM
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Junior Head-Fi'er
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Join Date: May 2008
Location: Somewhere in the Sierra Nevadas
Posts: 19
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DPS placement?
I just received my Ultra Desktop Amp and Desktop Power Supply today. So recently, in fact, that I have not yet tried it out! This is a huge upgrade for me, and I am not wanting to rush anything.
Does it matter whether I place the DPS on top of the amp, or the amp on top of the DPS? Or is this just a matter of personal preference? I looked online for photos and saw the amp sitting atop the DPS on two occasions, but also saw the reverse once as well.
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03-06-2009, 02:26 AM
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Headphoneus Supremus
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Join Date: Oct 2004
Location: Manhattan
Posts: 6,147
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I would place the amp on top of the DPS.
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"When stupidity is a sufficient explanation, there is no need to have recourse to any other."
F e e d b a c k
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03-06-2009, 02:49 AM
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100+ Head-Fi'er
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Join Date: Mar 2004
Location: On a little street in Singapore
Posts: 408
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DPS below for me. Allows the amp to dissipate heat better, makes it easier to access the back panel and looks nicer as well IMO.
And yes, the DPS does make a difference to me  .
Here are some of my thoughts on the Balanced Desktop with PSU: A new addition to the family: Headroom Balanced Desktop - SGHeadphones
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03-15-2009, 03:53 AM
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Junior Head-Fi'er
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Join Date: May 2008
Location: Somewhere in the Sierra Nevadas
Posts: 19
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I now have the amp on top of the DPS. It does make the amp easier to access in the back, but it is slightly harder to turn off the DPS. I have to reach up and over the stack to find the power switch. But even though I use the DPS power switch more often than I find the need to mess with the rear inputs/outputs of the amp, I still prefer this setup. It looks better, and the amp does run hotter than the DPS (although the heat doesn't seem like it will ever be a problem regardless).
Thanks for the input.
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03-16-2009, 06:09 AM
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Junior Head-Fi'er
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Join Date: May 2008
Location: Somewhere in the Sierra Nevadas
Posts: 19
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Another DPS question.
When I turn the unit off, the green light stays on for a while before dimming and then finally going out. Is this normal? I want to make sure just in case this might be a reflection of something going wrong with an internal component.
edit: it takes around 30 seconds for the light to fade out entirely.
Last edited by Huuvola; 03-16-2009 at 09:32 AM.
Reason: more info
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03-16-2009, 11:00 AM
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Headphoneus Supremus
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Join Date: Aug 2005
Posts: 2,439
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Quote:
Originally Posted by Huuvola
Another DPS question.
When I turn the unit off, the green light stays on for a while before dimming and then finally going out. Is this normal? I want to make sure just in case this might be a reflection of something going wrong with an internal component.
edit: it takes around 30 seconds for the light to fade out entirely.
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It's known as a large power supply capacitor and you wouldn't want to be doing without it...
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03-16-2009, 09:26 PM
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Junior Head-Fi'er
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Join Date: May 2008
Location: Somewhere in the Sierra Nevadas
Posts: 19
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Sorry, I don't think I was clear enough in my previous post.
When I'm done using my desktop amp, I turn it off. Then I turn off my DPS. But after I turn the DPS off, the light stays on a lot longer (~30 secs) than I am used to seeing in electronic equipment.
I am just wanting to make sure this is not a sign of a problem. If this happens to other owners of the power supply then I am not worried., but if it particular to my unit only, then I need to take action.
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03-16-2009, 09:34 PM
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100+ Head-Fi'er
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Join Date: Apr 2008
Location: the Netherlands
Posts: 197
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I also have the DPS and the led stays on for a while too after turning of the DPS.
The large power supply capacitor(s) slowly unload, nothing to worry about.
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03-16-2009, 09:43 PM
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Headphoneus Supremus
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Join Date: Oct 2004
Location: Manhattan
Posts: 6,147
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Same thing happened with mine.
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"When stupidity is a sufficient explanation, there is no need to have recourse to any other."
F e e d b a c k
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03-16-2009, 11:13 PM
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Garmentus Vulgaris & Headphoneus Supremus Premier Sponsor HeadRoom
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Join Date: Jun 2001
Location: Bozeman, Montana
Posts: 2,855
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Quote:
Originally Posted by Jerrycan
I also have the DPS and the led stays on for a while too after turning of the DPS.
The large power supply capacitor(s) slowly unload, nothing to worry about.
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Yupper! That's correct. Nothing to worry about.
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Cheers!
Tyll (Like on the floor, only spelled different.)
I just blogged all over my keyboard.
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03-17-2009, 03:28 AM
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Junior Head-Fi'er
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Join Date: May 2008
Location: Somewhere in the Sierra Nevadas
Posts: 19
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Great! I figured it was better to be safe than sorry.
Thanks for allaying my concern. 
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03-22-2009, 07:39 PM
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Junior Head-Fi'er
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Join Date: Feb 2009
Posts: 23
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Well, I have the DPS below the UDA because in fact the UDA runs heater than the Power Supply and this way I get better heat dissipation
Now my own question 
Anyone knows if it is necessary to turn off both modules when you go to bed? or in fact doing so we are shorting the DPS and UDA useful life ?? .gif "Confused Face(1)")
Anyone knows?
__________________
...... Phones protect my music from neighbors late at night 
Phones: AKG K702, AKG K701, Senn 600, Senn 580, expecting Senn 800
Sources: dCS P8i CD-SACD player and PC (Soundblaster XFi), via Toshlink to MaxDAC
Amp(s): HeadRoom Ultra Desktop with MaxDac, Rega Ear, Creek OBH-11
Last edited by guguplex; 03-22-2009 at 09:10 PM.
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03-22-2009, 09:50 PM
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Garmentus Vulgaris & Headphoneus Supremus Premier Sponsor HeadRoom
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Join Date: Jun 2001
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Quote:
Originally Posted by guguplex
Anyone knows if it is necessary to turn off both modules when you go to bed? or in fact doing so we are shorting the DPS and UDA useful life ??
Anyone knows? |
It's prolly technically better to turn off the amp first, and then the PS.
Most likely damage during power down is one (either the positive or negative) power supply shuts down before the other. Because the amps are DC coupled, when one rail shuts down before the other it's possible to get some fairly big DC offsets at the output that might push DC through the headphones and damage them.
If you power down the headphone amp first, its smaller capacity power filtration sections deplete faster than if you were to turn off the power from the desktop power supply.
Me? I just turn off the power supplies. But I'm supposed to stress test stuff.
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Cheers!
Tyll (Like on the floor, only spelled different.)
I just blogged all over my keyboard.
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03-22-2009, 11:49 PM
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Junior Head-Fi'er
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Join Date: Feb 2009
Posts: 23
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OK Tyll ..... so you mean:
"Do what I say and not what I do ...... " 
But... the other side of the question is:
I should leave the DPS and the Ultra Desktop always ON or ... we must turn them off when we go to bed... what you think ..... or ... better...what you do?
Wait for your ilumination.... 
__________________
...... Phones protect my music from neighbors late at night
Phones: AKG K702, AKG K701, Senn 600, Senn 580, expecting Senn 800
Sources: dCS P8i CD-SACD player and PC (Soundblaster XFi), via Toshlink to MaxDAC
Amp(s): HeadRoom Ultra Desktop with MaxDac, Rega Ear, Creek OBH-11
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03-23-2009, 01:01 AM
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Garmentus Vulgaris & Headphoneus Supremus Premier Sponsor HeadRoom
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Join Date: Jun 2001
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Posts: 2,855
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Quote:
Originally Posted by guguplex
Wait for your ilumination.... |
Humble opinion is about all you're going to get from this one of what everybody's got:
Don't leave them on, it's a waste of juice.
They sound fine from the moment you turn them on.
__________________
Cheers!
Tyll (Like on the floor, only spelled different.)
I just blogged all over my keyboard.
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