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Old 6th January 2009, 10:37 PM   #1251
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Quote:
Originally posted by Joshua_G
It should affect the stage imaging.

Sure I can see how that would follow, especially for single ended circuits, but practical experience tells me that the superb PSRR of the super symmetrical I/V stage will keep crosstalk at a minimum even with shared supplies. Especially regulated supplies.

But do what you like, there is no harm. If you like it better with a supply for each channel then that's great!

Cheers!
Russ
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Old 7th January 2009, 01:04 AM   #1252
krgaunt is offline krgaunt  United States
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Quote:
Originally posted by Russ White
Hi Ross.

Well I would say the VREF mod is the most effective of the two. But if you have a suitable PS handy then there is no reason not to try powering the clock separately. I guess it just depends on how much your want to modify the board and how much time you have.

The current IVY (with C13-16 10nf and R17-20 jumpers) configuration is very strongly suggested.

Cheers!
Russ

Thanks. I already received the IVY mod caps from Digikey, still waiting for parts from Mouser for the VREF mod.

Regarding the other suggestion for separate supplies for the IVY, I don't think my ears would hear the difference. Although I did use separate transformers for the Sympatico amp. I think I went over board on the transformers though, each is 650VA and each weights 9 lbs. Sorry for getting off topic.

RossG
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Old 7th January 2009, 04:28 AM   #1253
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Quote:
Originally posted by krgaunt
I think I went over board on the transformers though, each is 650VA and each weights 9 lbs.
That's exactly what I use on each of my Sympatico monoblocks. At one time I was actually using two 1KVA trafos.
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Old 8th January 2009, 01:56 AM   #1254
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Second buffalo build went very smoothly tonight. Sure is a lot easier the second time round!

Russ/Brian - whats the story on setting that switch 3 low on the newer builds? Do I still need to do that? I'm getting lock and sound A1?


Fran
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Old 8th January 2009, 02:13 AM   #1255
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If its the current version (PCB version 1.2) then you can leave switch 3 high (which is the default when its open). Low is fine too. It just changes a register that even Dustin is not convinced has any significant effect.
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Old 9th January 2009, 03:54 PM   #1256
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Default Friday has arrived!

I have the green light to share the details I know.

Dustin has been very gracious to share these details with me, and I now share them with you with his permission.

I have to say the ESS has an excellent attitude toward DIY folks. It wonderful we get to play with such a fine DAC.

Here is what Dustin told me:

This is a new DAC that has many new features:

1. The Sabre32 has complete 32bit data path with 64bit MAC's

2. Each of the 8 channels has a completely programmable FIR filter. (meaning you can program all the 32-bit coefficients, to make an Eq or normalize a certain speakers freq-resp etc)

3. DPLL bandwidth can now go to as low as 1/64th of the Sabre8 for even better jitter rejection.

4. SPDIF receiver locks "instantly" on any DPLL BW setting no cracks and pops using lower DPLL BW settings.

5. Data1-Data8 can all be used as an SPDIF input under software control. (basically there is an 8 channel MUX in the chip)

6. I2S, DSD, SPDIF are all auto-detected now with no requirement for I2C control. (can shut off though if needed)

7. SPDIF input detects the deemphasis flag for both consumer and pro format and automatically uses the the deemphasis filter.

8. All of the SPDIF channel status data is able to be read over I2C

9. True Mono mode for someone who wants all 8 channels to be "bridged" also the chip can be programmed to use the left or right channel as the source.

10. Master trim for all channels at 32bit accuracy (channel independent volume is still 0.5dB per step)

11. Auto-mute look back control to set the external flag (auto-mute output pin) upon detection, but not ramp the volume control down. This allows for external mute without internal ramp.

That's the major stuff. Thanks to Dustin for giving me the green light to share this information with you.

Here at Twisted Pear we have a couple new DAC modules on the way for Sabre32.

One module will be a "Tweaker's" board with only the necessities on the board and terminals for external supplies/clocks etc. This will be great for experimenting etc.

The other will be a complete fresh new design with features driven by the experience we gained from the Buffalo.

Cheers!
Russ
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Old 9th January 2009, 04:25 PM   #1257
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Quote:
Originally posted by Joshua_G
It should affect the stage imaging.
I think the effect will be really small.

Not only does IVY have excellent PSRR (especially in balanced mode), it is also a good citizen - in balanced mode the current drain, to a very good approximation, is independent of the signal, so even a high impedance supply will be hardly modulated.
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Old 9th January 2009, 04:28 PM   #1258
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Thanks, Russ.
Great news.
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Old 9th January 2009, 04:53 PM   #1259
NeoY2k is offline NeoY2k  France
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Wow????? An ESS Sabre ADC??? Is this what I've read?


SO GREAT NEEEEEWS!!!!

(sorry xD ).

I'm designing a kind of big soundcard. And that is good news! However the TI's part (don't remember the ref) is still very impressive. But... I don't know why I guess this chip is a killer. Again.

Wow. Champagne this evening!
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Old 9th January 2009, 11:46 PM   #1260
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Default Re: Friday has arrived!

Quote:
Originally posted by Russ White

I have to say the ESS has an excellent attitude toward DIY folks. It wonderful we get to play with such a fine DAC.

SNIP

2. Each of the 8 channels has a completely programmable FIR filter. (meaning you can program all the 32-bit coefficients, to make an Eq or normalize a certain speakers freq-resp etc)
[/B]

Two thoughts:

1. The work that you guys at TP have done has no doubt furthered the market acceptance of the 9008 and our constructive feedback probably goes a long ways to promote the good graces we DIYers seem to enjoy at ESS. Thank you, Russ, Brian, Dustin and others who contribute here, for the generous DIY spirit that is not only productive but also contagious.

2. As someone who has implemented PC-based digital XOs and DRC in the sources for my DACs, on-chip FIR filters are particularly interesting. I'm not enthralled with currently-available 'enthusiast' software. Meanwhile, with filters in the DAC, DIY speaker building/development can get a whole lot more goof-proof! This means, of course, that a) we may want to re-think the "stereo" approach to I/V to more easily (or economically?) handle additional channels, and b) those of us who are I2S-noobs (or just "challenged") will be looking for a front-end to control each of those channels. Could the TP 'Audio Controller' line be expanded to handle these kinds of tasks?
What kinds of implementations of the FIR filters are in the minds of the TP wizards???

All the best!

Frank
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