Optimizing a CS8414 + DF1704 + 4x PCM1704 DAC? - Page 2 - diyAudio
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Old 11th October 2004, 03:59 PM   #11
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Quote:
So......you want to take out all of the filtering?
Yes, as a proposal to answer some (all?) of dieringe's questions. Compared to his intention (receiver, DF, clock, PCB etc.) this would be an easy and worthwhile experiment. I cannot really comment on the DF1704 though.
Quote:
Why?
Maybe because it might sound good?
Quote:
Ever hear of IMD and aliasing?
Yes, and also about the various debates regarding the filterless versus filtered approach. I didn't say the filterless way sounds best under all circumstances but I would at least give it a try. And it doesn't hurt...
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Old 11th October 2004, 07:25 PM   #12
borges is offline borges  Norway
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Without analog filtering, you get linear phase response. However, designing a linear-phase digital filter is actually hard to avoid, no matter the rollof.

Greetings,

Børge
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Old 11th October 2004, 07:27 PM   #13
borges is offline borges  Norway
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Martin,

mail me your email address and I'll send you my Eagle library featureing the 1704 and other oddities.

Greetings,

Børge
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Old 11th October 2004, 08:33 PM   #14
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Default So what about "linear phase response"?

Too bad every signal encoded onto a CD is run through a brick wall on the A/D end.

It doesn't hurt?? Your tweeter may not agree.

Jocko
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Old 11th October 2004, 11:02 PM   #15
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Default Re: So what about "linear phase response"?

Quote:
Originally posted by Jocko Homo

It doesn't hurt?? Your tweeter may not agree.
the tweeter shouldn't bother, it's a lowpass filter itself if it isn't a supersonic tweeter
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Old 11th October 2004, 11:10 PM   #16
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Default No, it won't "bother" it.....

Just make more HF thash.

Enjoy the sound!

Jocko
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Old 11th October 2004, 11:14 PM   #17
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Default Re: Re: Optimizing a CS8414 + DF1704 + 4x PCM1704 DAC?

Quote:
Originally posted by Fabian

Yes I've compared slow vs. fast roll of and I prefered slow filter. Switching the filter response is quite easy to implement. Just compare and see what's more apealing to your ears.
As you've already removed the filter from your D1 outputstage, I guess you will like the soft roll of setting. Removing the whole digital filter is like going one step further.

well my perception is that the fast roll-off gives a little better resolution, the slow roll-off gives a more analog-like sound. can't really decide which I like better.

I have another question:

6. there is a bunch of capacitors at each PCM1704. As this is HF stuff I guess tantalum electrolytics are the preferred type?

m.
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Old 12th October 2004, 01:38 AM   #18
vit is offline vit  Sweden
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I wouldn't use tantalum caps. It's better to use OsCon electrolytics bypassed with a ceramic or MKP film cap.
Recommended paper written by Guido Tent

Check out Olimex for cheap proto PCB.


//vit

edit: Olimex recommendation
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Old 12th October 2004, 02:38 AM   #19
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Default Re: Re: Re: Optimizing a CS8414 + DF1704 + 4x PCM1704 DAC?

Quote:
Originally posted by dieringe

there is a bunch of capacitors at each PCM1704. As this is HF stuff I guess tantalum electrolytics are the preferred type?
Here's what Madrigal's using in their $17K DAC . The chips under nude Vishays are PCM1704 http://www.marklevinson.com/image_li...30_6DAC_lo.jpg
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Old 12th October 2004, 05:00 AM   #20
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Default Re: No, it won't "bother" it.....

Quote:
Originally posted by Jocko Homo
Just make more HF thash.

Enjoy the sound!

Jocko
If he can do this

Quote:
Originally posted by dieringe
<snip>
I think I can hear some aliasing
<snip>
with a 8x oversampling dac, he may well enjoy the HF hash.
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