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Old 22nd November 2011, 04:44 AM   #901
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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.
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Old 22nd November 2011, 06:29 AM   #902
qusp is offline qusp  Australia
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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
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Old 22nd November 2011, 07:15 AM   #903
sek is offline sek  Germany
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Quote:
Originally Posted by qusp View Post
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.
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Old 22nd November 2011, 07:34 AM   #904
qusp is offline qusp  Australia
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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.
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Old 22nd November 2011, 09:51 AM   #905
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Owen, can you tell me height of populated PCB? Will it fit into 1U chassis?
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Old 22nd November 2011, 11:14 AM   #906
qusp is offline qusp  Australia
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depends on the heatsinks you use for the PSU, if you use the chassis floor definitely yes
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Old 22nd November 2011, 01:24 PM   #907
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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!
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Old 22nd November 2011, 02:17 PM   #908
nattawa is offline nattawa  Canada
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Holy Smoke

The Wire . a piece of wire!
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Old 22nd November 2011, 09:46 PM   #909
sek is offline sek  Germany
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Owen,

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

Thanks!
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Old 23rd November 2011, 02:14 AM   #910
fualcr is offline fualcr  Canada
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Post 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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