"The Wire" Ultra-High Performance Headphone Amplifier - PCB's - Page 91

forsakenrider · 22nd November 2011, 04:44 AM

DARN! how did I miss this? I hope there will be a second run of the SE-SE kit! I would love to build one.

qusp · 22nd November 2011, 06:29 AM

Owen, that is truly spectacular! Kudos to you and the guys at National, i dont think ive seen anything quite like that before. i find it intriguing that the THD is actually lower at 7v than 1V, is this simply due to less attenuation/higher DNR of the signal source?

the SE-SE amp with psu is a real bargain if looking for an SE amp. the phase plots are crazy

sek · 22nd November 2011, 07:15 AM

Quote:

Originally Posted by qusp

THD is actually lower at 7v than 1V, is this simply due to less attenuation/higher DNR of the signal source?

It's THD+N. The noise remains constant, thus contributing less to the figure with higher drive level.

qusp · 07:46 AM

yeah i though about that after, thanks. given opc said he was bouncing against the AP signal generator noise floor i thought perhaps that was what was staying constant vs the signal amplitude; basically in the same way as you describe the self-noise THD+N.

its just not that common to see a loaded amplifier with signal input thats noise/distortion doesnt increase with amplitude, let alone the opposite

edit: except that there is no gain increase here, just signal amplitude

btw ive got a long reply to your massive post to me yesterday, but i might just PM you with it as its a 'bit' OT

igor0203 · 22nd November 2011, 09:51 AM

Owen, can you tell me height of populated PCB? Will it fit into 1U chassis?

qusp · 22nd November 2011, 11:14 AM

depends on the heatsinks you use for the PSU, if you use the chassis floor definitely yes

CaféNoir · 22nd November 2011, 01:24 PM

Hi owen,
I am upgrading my two PCBs-only to full kits, if that is still possible.

All in all:
-4 PSU full kits
-2 SE-SE full kits
-2 BAL-BAL full kits

Thanks!

nattawa · 22nd November 2011, 02:17 PM

Holy Smoke

The Wire

. a piece of wire!

sek · 22nd November 2011, 09:46 PM

Owen,

any chance you could also pull off some RMAA measurements for comparison?

Thanks!

fualcr · 23rd November 2011, 02:14 AM

Hi Owen - your measurements just convinced me to do something I've always dreamed of! I would be most appreciative if you could please *add* the following to my existing order (if it isn't asking too much):

3 x BAL-SE full kits
1 x BAL-SE bare PCB

If you don't have the parts to fulfill the above as full kits, then please feel free to "downgrade" them to just bare PCBs. My diy studio IEM system is going to sound world class thanks to you!

22nd November 2011, 07:34 AM	#904
qusp is choosing a less facetious title... diyAudio Member Join Date: Oct 2009 Location: Brisbane, Australia	yeah i though about that after, thanks. given opc said he was bouncing against the AP signal generator noise floor i thought perhaps that was what was staying constant vs the signal amplitude; basically in the same way as you describe the self-noise THD+N. its just not that common to see a loaded amplifier with signal input thats noise/distortion doesnt increase with amplitude, let alone the opposite edit: except that there is no gain increase here, just signal amplitude btw ive got a long reply to your massive post to me yesterday, but i might just PM you with it as its a 'bit' OT Last edited by qusp; 22nd November 2011 at 07:46 AM.

23rd November 2011, 02:14 AM	#910
fualcr diyAudio Member Join Date: Sep 2011 Location: Canada	Order add on... Hi Owen - your measurements just convinced me to do something I've always dreamed of! I would be most appreciative if you could please add the following to my existing order (if it isn't asking too much): 3 x BAL-SE full kits 1 x BAL-SE bare PCB If you don't have the parts to fulfill the above as full kits, then please feel free to "downgrade" them to just bare PCBs. My diy studio IEM system is going to sound world class thanks to you!

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22nd November 2011, 04:44 AM	#901
forsakenrider diyAudio Member Join Date: Oct 2007 Location: Montreal, Qc	DARN! how did I miss this? I hope there will be a second run of the SE-SE kit! I would love to build one.

22nd November 2011, 06:29 AM	#902
qusp is choosing a less facetious title... diyAudio Member Join Date: Oct 2009 Location: Brisbane, Australia	Owen, that is truly spectacular! Kudos to you and the guys at National, i dont think ive seen anything quite like that before. i find it intriguing that the THD is actually lower at 7v than 1V, is this simply due to less attenuation/higher DNR of the signal source? the SE-SE amp with psu is a real bargain if looking for an SE amp. the phase plots are crazy

22nd November 2011, 09:51 AM	#905
igor0203 diyAudio Member Join Date: Dec 2008 Location: Ljubljana, Slovenia	Owen, can you tell me height of populated PCB? Will it fit into 1U chassis?

22nd November 2011, 11:14 AM	#906
qusp is choosing a less facetious title... diyAudio Member Join Date: Oct 2009 Location: Brisbane, Australia	depends on the heatsinks you use for the PSU, if you use the chassis floor definitely yes

22nd November 2011, 01:24 PM	#907
CaféNoir diyAudio Member Join Date: Feb 2010	Hi owen, I am upgrading my two PCBs-only to full kits, if that is still possible. All in all: -4 PSU full kits -2 SE-SE full kits -2 BAL-BAL full kits Thanks!

22nd November 2011, 02:17 PM	#908
nattawa diyAudio Member Join Date: Apr 2010 Location: Mississauga, Ontario	Holy Smoke The Wire . a piece of wire!

22nd November 2011, 09:46 PM	#909
sek diyAudio Member Join Date: May 2003 Location: Berlin	Owen, any chance you could also pull off some RMAA measurements for comparison? Thanks!