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Old 15th November 2012, 03:46 PM   #1341
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Regarding the Auricap I'm starting to doubt that a 10uF will cut it for me. After running some more calculations and some simulations (thanks Owen for the nice test circuit!) I think I need at least a 22uF, preferrably higher, which isn't feasible for the group buy I guess.

I would like to get Owen's input on increasing the input impedance on the Wire AB amp, but unless it can be raised to at least somewhere around 4k without sacrificing too much performance (which I'd venture to guess Owen would have done if it was indeed possible), anything less than 22uF is probably too small.

I will think about it tonight and then remove myself from the Auricap list if I don't change my mind.
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Old 15th November 2012, 04:19 PM   #1342
qusp is offline qusp  Australia
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ahh, ok so before I do anything more, has everyone thought about this problem? so far it seems that at least half who have given it serious thought have discovered at this late stage that its not enough, its a bit bloody frustrating ive gotta say, ive been pushing people to think this through for weeks
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Old 15th November 2012, 05:02 PM   #1343
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Quote:
Originally Posted by Emphrygian View Post
Regarding the Auricap I'm starting to doubt that a 10uF will cut it for me. After running some more calculations and some simulations (thanks Owen for the nice test circuit!) I think I need at least a 22uF, preferrably higher, which isn't feasible for the group buy I guess.

I would like to get Owen's input on increasing the input impedance on the Wire AB amp, but unless it can be raised to at least somewhere around 4k without sacrificing too much performance (which I'd venture to guess Owen would have done if it was indeed possible), anything less than 22uF is probably too small.

I will think about it tonight and then remove myself from the Auricap list if I don't change my mind.
With the BAL-BAL headphone amp, I really wouldn't hesitate to suggest changing to 10k resistors, but with The Wire power amp, I would not go any higher than what is already there. The noise penalty quickly starts to negate the advantages of a differential arrangement, and I personally wouldn't do it.

Increasing the value of that capacitor will only cost a few extra dollars, and has absolutely no negative impact other than the small cost. Increasing the resistor values in the power amp on the other had, will have an audible impact on noise floor, making it a bad idea.

Cheers,
Owen
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Old 15th November 2012, 05:18 PM   #1344
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Thank you for that answer Owen. I guessed as much, but now we have it in print. So, I'm out of the Auricap GB. Still in for Zfoil, Keratherm and enclosure.

Sorry for adding to your frustration qusp, but sometimes when my brain reads the words "group" and "buy" close together, it ceases to function properly for a while
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Old 15th November 2012, 05:18 PM   #1345
qusp is offline qusp  Australia
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no his concerns are valid, increasing the cap to 22uf if he wants auricap, is not a few dollars, they only go up to 20uf and it adds like 16USD each, particularly as I dont like the chances of convincing everyone to get 22uf caps, which would be needed to get the discount.

going from 4.7uf to 10uf is only a few dollars, which is why thats what i'm suggesting we do, but its a big jump up to the 20uf

no worries I know the syndrome Emphrygian hehe, I know it well, but i'm concerned that even with all the conversation i'm still going to get a lot who pull out because they didnt think it through. but anyway I guess i'll send out the PM's now and cross fingers...

Last edited by qusp; 15th November 2012 at 05:22 PM.
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Old 15th November 2012, 05:19 PM   #1346
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ZFoil

Qusp
Pinnocchio
MisterRogers
Rolle
BigPandahk
Reenberg
lwif
analog_sa
atom6422
crazikid
flocchini
vitalica
hirez69
lm1no2
Coolhead
ccliu
macfixer
tehrkn
Blitz
Slartibartfasst
necplusultra
Regland
woresseo
Malvin
Greg Stewart
Emphrygian

Capacitors - Auricap XO

Pinnocchio
Bigpandahk
reenberg
lwif
atom6422
crazikid
MisterRogers
hirez69
lm1no2
Coolhead
ccliu
macfixer
tehrkn
necplusultra
Regland
woresseo
vitalica
Greg Stewart

Capacitors - Vcap CuTF for Bypass


Keratherm

Pinnocchio
bigpandahk
Reenberg
Rolle
hirez69
lwif
atom6422
crazikid
flocchini
MisterRogers
lm1no2
Coolhead
ccliu
macfixer
tehrkn
kasey197
Blitz
Slartibartfasst
necplusultra
woresseo
Malvin
Greg Stewart
Emphrygian

Enclosure

Pinnocchio
Rolle
crazikid
MisterRogers
ccliu
qusp
woresseo
vitalica
Emphrygian
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Old 15th November 2012, 05:36 PM   #1347
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I will start driving my radford sta 15 ( 1ookohm) through some kind of bal-unbal transformer,so I'm quite sure I can live with ll solutions. But lets aim as high as posible for the rest of the crowd
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Old 15th November 2012, 05:43 PM   #1348
qusp is offline qusp  Australia
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thanks for the feedback mate, yeah i'm going for 10uf as its only about 4 each more than 4.7uf, it goes to 12uf then there arent any values till 20uf which is considerably more expensive and I wouldnt be interested myself at that point
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Old 15th November 2012, 07:02 PM   #1349
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ZFoil

Qusp
Pinnocchio
MisterRogers
Rolle
BigPandahk
Reenberg
lwif
analog_sa
atom6422
crazikid
flocchini
vitalica
hirez69
lm1no2
Coolhead
ccliu
macfixer
tehrkn
Blitz
Slartibartfasst
necplusultra
Regland
woresseo
Malvin
Greg Stewart
Emphrygian

Capacitors - Auricap XO

Bigpandahk
reenberg
lwif
atom6422
crazikid
MisterRogers
hirez69
lm1no2
Coolhead
ccliu
macfixer
tehrkn
necplusultra
Regland
woresseo
vitalica
Greg Stewart

Capacitors - Vcap CuTF for Bypass


Keratherm

Pinnocchio
bigpandahk
Reenberg
Rolle
hirez69
lwif
atom6422
crazikid
flocchini
MisterRogers
lm1no2
Coolhead
ccliu
macfixer
tehrkn
kasey197
Blitz
Slartibartfasst
necplusultra
woresseo
Malvin
Greg Stewart
Emphrygian

Enclosure

Pinnocchio
Rolle
crazikid
MisterRogers
ccliu
qusp
woresseo
vitalica
Emphrygian
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Old 15th November 2012, 09:19 PM   #1350
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Join Date: Dec 2011
added myself to enclosure and keratherm.

ZFoil

Qusp
Pinnocchio
MisterRogers
Rolle
BigPandahk
Reenberg
lwif
analog_sa
atom6422
crazikid
flocchini
vitalica
hirez69
lm1no2
Coolhead
ccliu
macfixer
tehrkn
Blitz
Slartibartfasst
necplusultra
Regland
woresseo
Malvin
Greg Stewart
Emphrygian

Capacitors - Auricap XO

Bigpandahk
reenberg
lwif
atom6422
crazikid
MisterRogers
hirez69
lm1no2
Coolhead
ccliu
macfixer
tehrkn
necplusultra
Regland
woresseo
vitalica
Greg Stewart

Capacitors - Vcap CuTF for Bypass


Keratherm

Pinnocchio
bigpandahk
Reenberg
Rolle
hirez69
lwif
atom6422
crazikid
flocchini
MisterRogers
lm1no2
Coolhead
ccliu
macfixer
tehrkn
kasey197
Blitz
Slartibartfasst
necplusultra
woresseo
Malvin
Greg Stewart
Emphrygian
outriding

Enclosure

Pinnocchio
Rolle
crazikid
MisterRogers
ccliu
qusp
woresseo
vitalica
Emphrygian
outriding
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