DAC 2496 (AK4393) DAC KIT With CS8416+AK4393+5532 - Page 26 - diyAudio
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Old 29th June 2011, 01:48 PM   #251
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Quote:
Originally Posted by Ipanema View Post
Funny though. I prefer the sound without LPF capacitor in the output stage. Anyone have the same preference?
Trust your ears. I recommend to don't force yourself to use LPF section. I'm using AK4396's for 4 years without any active or passive LPF. Just a carbon type resistor and dc blocking cap. This is the shortest way for getting into pure sound.
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Old 29th June 2011, 02:15 PM   #252
erin is offline erin  Australia
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Agreed that people should trust their own ears. The filter caps can add a very noticeable signature to the sound. Some may prefer no cap to a bad cap. Paul_Peraic and I recommend KP1830 capacitors in this location, however Evox PFR I think are also film foil capacitors and would also be good candidates for this location. Film foil caps IMO seem to be the least intrusive sonically in filter circuits. they are also popular with some people when building and upgrading phono pre-amps.

Other possibilities for caps in this location are axial polystyrene, which i have tried, but they can add a little bit of brightness ( or perhaps sibilance), but there are so many brands, that this statement may not be true for all polystyrene. However I still prefer polystyrene over most MKT caps.

From my previous experiments (on other DAC chips) I prefer to have a filter. YMMV

Last edited by erin; 29th June 2011 at 02:20 PM.
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Old 29th June 2011, 02:56 PM   #253
ljm_ljm is offline ljm_ljm  China
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Thank you all for the DAC attention.
At present the DAC is blue, before had green. Just new PCB improved the production process materials, demand higher some.

I'll try to select high-quality capacitors offer to friends. So some of the models and may capacitance is not consistent. I'm so sorry.

Because I don't know EABY. So DAC is mainly to a few friends in China to sell, and if there are any questions can contact me. Thank you.
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Old 29th June 2011, 03:50 PM   #254
johnm is offline johnm  United Kingdom
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I was just wondering who's the 'official' Ebay seller of this DAC kit? I noticed several sellers are offering it at the moment...
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Old 29th June 2011, 03:58 PM   #255
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Originally Posted by johnm View Post
I was just wondering who's the 'official' Ebay seller of this DAC kit? I noticed several sellers are offering it at the moment...
The only seller i could find for the un-assembled kit version was zoe_tsang, and that's the one i've ordered. Seems to be a couple sellers of the assembled board.

NEW Hi end DAC 24 BIT 192K HZ AK4396 sc | eBay UK
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Old 29th June 2011, 05:39 PM   #256
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Default Zoe_tsang

Hi,
i have ordered from Zoe_tsang and had a few email exchanges with him. He has been very helpful so far.. the boards are expected in a few weeks.

Re the filtering after the AK4396. On another forum, re. the mods to a Sony PlayStation PS1, one of the more successful (and simple) mods is to take the output directly from the pins on the DAC directly to a pre-amp. As my pre-amp already had a capacitor on the input I used no filtering whatsoever and it sounds really great. It seems to me that builders of this board should set up the possibility of direct and filtered outputs via a switch for A-B comparison...keeping in mind that the non-filtered output might have some DC on it (OK, if you have a cap in the pre-amp input as above). Changes in this area can make big differences on the sound qualities.
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Old 29th June 2011, 05:50 PM   #257
YohY is offline YohY  United Kingdom
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Default Filter differences (as spec'd by Asahi Kasei)

Quote:
Originally Posted by erin View Post
...The filter caps can add a very noticeable signature to the sound.
Ok, I've checked the spec sheets (Clave did a great job of modelling two of these circuits in a previous post- cheers again Clave),
But after looking at all three AK IC LPF specs, it's clear there are differences...

Here's the info :-
AK 4393
AK 4393.jpg

AK 4395
AK 4395.jpg

AK 4396
AK 4396.jpg

So, if you're gonna stick with whatever chipset/pcb you've bought (and opamp output stage), you're gonna need to make sure you have the correct values.

My kit? -It came fitted with the 4396 IC & filter configuration for the 4393!!!!

So there you go George - yet another variable to add into the mix ! lol

-Andy-
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Old 29th June 2011, 06:03 PM   #258
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Default Configuration management

Actually all this confusion is not too bad. I teach Project Management (specifically PRINCE2). A major part of that is Configuration Management, being able to deal with change consistently and managing the various configurations (in this case the board layouts, component versions, chip versions and so on). Clearly my friend Zoe_tsang has not got this implemented properly. So, it is more fun for us, and gives me a real-world example for my next class. Thanks to all involved. Enjoy
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Old 29th June 2011, 06:12 PM   #259
YohY is offline YohY  United Kingdom
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Default Filter diff's

I refer to Clave's earlier observation:

Quote:
Originally Posted by ClaveFremen View Post
Ouch!
...So for the two DACs a different LPF is required!!!

Then I've checked the one of AK4395 (identical to AK4393 one) and AK4399 (different values from AK4393/95 and AK4396).

So this kit should have different LPF's resistors and caps for the two chips...

I've attached the two output stages and, since to me they're a Sallen-Key filter, two graphs that shows the difference (made with this calculator).

The AK4396 outstage is clearly more rolled-off...
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Old 30th June 2011, 09:59 AM   #260
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Default Compatibility

So, although the 4395 and 4396 are considered to be "pin-compatible"... apart from voltage requirements, the filtering requirements appear to be unique to each device.
I wonder how this affects the many people who have been upgrading Behringer equipment by performing chip-swaps? In some cases they have gone for elaborate post-DAC circuitry, but if there is this difference I do not remember it being brought out in any of the upgrade discussions. This gets more and more mysterious. Could this be a case of The Emperor's Clothes?
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