DAC 2496 (AK4393) DAC KIT With CS8416+AK4393+5532 - Page 66 - diyAudio
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Old 12th September 2011, 09:19 PM   #651
Reality first!
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Originally Posted by data View Post
I use Opamps on cork board if I run out of thumb tacks, they work really good
Well, it's a (almost) a free world...

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But if you haven't tried those alternatives, you will never know how well they work, no?
Sure, I do agree.

Did you tried OPA827?

But there's one thing you should consider...

With transformers or tubes do you design a filter equivalent (same frequency and slope) of the one on datasheet?

I know for sure that the AK4393 LPF don't suits well AK4396, the difference is clearly audible...did you take it in account while designing the tube/transformer output stage?
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Old 12th September 2011, 11:38 PM   #652
erin is offline erin  Australia
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thanks Erin so much for seeking this board. As I can see it has not balanced input and I just wonder what will happen with +/- (balanced?) output of AK4396?
If you did use that board, you just connect the + output to the tube board and leave the - output disconnected. Tubes have an input capacitance that you can use to your advantage as a natural low pass filter. You can adjust the frequency by adjusting the grid stopper resistor value.

Last edited by erin; 12th September 2011 at 11:52 PM.
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Old 13th September 2011, 09:01 AM   #653
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oh my goddess! it's more than my imagination! adjusting the resistor value sounds a bit complicated. it' only my second project! the first one is still on the table somewhere!

Almost finishd with the kit just waiting for the BrownDog from US! maybe coming on a GrayHound!
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Old 13th September 2011, 09:44 AM   #654
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Erin do you mean some thing like Click the image to open in full size.?
or is this completely another design?
what you guys thin about this concept here? it's the same dac anyway.
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Old 13th September 2011, 02:55 PM   #655
Radian is offline Radian  Germany
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Originally Posted by erin View Post
The analog audio filter on the op-amps needs attention to remove the sibilance.
Erin, I don't know why you keep on suggesting to do anything to the analog stage of this dac. The ak4396 drives with ease any domestic gear without any active stage at all. I tried quite a few active stages and believe me, only a very well build Tube stage sounds better than the direct out mod.
There is no need for a filter either.
What do you think is the reason why serious modders first get rid of any opamp in the signal path?
Less is more.

Klaus
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Old 13th September 2011, 11:39 PM   #656
erin is offline erin  Australia
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Originally Posted by Radian View Post
Erin, I don't know why you keep on suggesting to do anything to the analog stage of this dac. The ak4396 drives with ease any domestic gear without any active stage at all. I tried quite a few active stages and believe me, only a very well build Tube stage sounds better than the direct out mod.
There is no need for a filter either.
What do you think is the reason why serious modders first get rid of any opamp in the signal path?
Less is more.

Klaus
Klaus, I use a tube output stage TDA1541 as my main DAC.

I realise that the AK4393 is a different beast to the Cirrus logic DAC chips, but when I tried connecting the Cirrus logic DAC directly to my pre-amp it sounded like it needed more current to drive my tube pre-amp. It was lacking bass and dynamics, and did sound to me like it needs a filter.

So, if you have tried CS DACs and the AK DAC and agree with me that CS needs more current drive, but AK is fine with current drive, then I will try the direct out mod. But somehow I doubt they will be different. Otherwise...... I absolutely always recommend some form of output stage to provide current drive. It gives a more lively sound. Yes there are some sonic advantages to the direct out mod, but also some downsides. To me the downside outweighs the advantages. YMMV.

Last edited by erin; 14th September 2011 at 12:01 AM.
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Old 13th September 2011, 11:48 PM   #657
erin is offline erin  Australia
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Originally Posted by Nosian View Post
Erin do you mean some thing like Click the image to open in full size.?
or is this completely another design?
what you guys thin about this concept here? it's the same dac anyway.
you could do it like that
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Old 14th September 2011, 12:02 AM   #658
F1 FAN is offline F1 FAN  Canada
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.. I absolutely always recommend some form of output stage to provide current drive. It gives a more lively sound. Yes there are some sonic advantages to the direct out mod, but also some downsides. To me the downside outweighs the advantages.

You asked, so I have answered.
I concur and am liking the results with a discrete Class A op-amp buffering the output.
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Old 14th September 2011, 01:21 AM   #659
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you could do it like that
If we count that extra cap at amplifiers input, signal have to pass 4 caps for reaching to amplifier.
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Old 14th September 2011, 02:11 AM   #660
erin is offline erin  Australia
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If we count that extra cap at amplifiers input, signal have to pass 4 caps for reaching to amplifier.
I'm crying.

The signal already passed through hundreds of cheap op-amps and really cheap nasty generic capacitors in the recording process before it got to the CD.

4 nice quality film caps arent a deal breaker.
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