CHORD ELECTRONICS DAVE
Oct 29, 2015 at 5:51 PM Post #601 of 25,842
Yes it will do dual data mode.
 
Output impedance is the PCB tracking to the OP, I have not measured it yet.
 
Yes you can use phono and XLR together, but gain is fixed.
 
Rob
 
Oct 29, 2015 at 6:04 PM Post #602 of 25,842
  Yes it will do dual data mode.
 
Output impedance is the PCB tracking to the OP, I have not measured it yet.
ack....
Yes you can use phono and XLR together, but gain is fixed.
 
Rob

 
thanks Rob for answering
 
now we are waiting for user's listening feedback....  (had DAVE been "listenable" already at some HiFi shows ?)
 
Oct 29, 2015 at 7:30 PM Post #603 of 25,842
Bigger question is;    Will DAVE sound better than QBD76 with dual inputs from Blu !      I'm guessing it won't as don't think this part of DAVE is an upgrade to the QBD76.    

I'm sure Rob can shed some light on this !   


Most likely it will take adatage of the better noise shaper and WTA filtering even here, so i dont see why it wouldn't sound better than QBD76 + Blu.

So the answer is Yes it will siund better..

Im i right @Rob Watts
?
 
Oct 30, 2015 at 3:03 AM Post #605 of 25,842
Dave is in a different league to the QBD76. Its like comparing an iphone 6 to a phone from 10 years ago - that's how much things have moved on!

Rob
But no daul AES Rob for your blu transport,which sounds better than coaxial,I've got 2 admit I'm abit disappointed with Chord about this,as really i think it should have daul AES.Still I'll demo dave and make up my own mind about the sound.
 
Oct 30, 2015 at 3:35 AM Post #606 of 25,842
  I think the obvious market for DAVE will be the classical music genre. I am not in that camp particularly but I think it is already clear that Rob Watts has opened a new door on what can be achieved in audio imaging depth and I suspect will change the whole industry in this respect over time. Because orchestrations are mic'd at distance, DAVE would seem an obvious choice for audiophiles who love classical music. I suspect this was in Rob's mind when designing the superior DSD filter as this is the one genre where DSD has established itself.
 
Can you imagine hearing that level of broad imaging for orchestrations and not falling in love with the realism? For a while I would expect Chord to have a captive market in that space. Classical music will be responsible for the sale of many Dave DACs imo.
 
It will be a harder sell in 'close mic'd genres' of course but that will come down to an assessment of the pure musical delivery I think and we have yet to hear a professional review of those capabilities.
 
Good luck to Chord and Rob Watts. I have to admire them.

Thank you for your kind comments.
 
The perception of depth is a weird phenomena and something we take for granted. I am on holiday in Catalan, Spain and yesterday visited the monastery at Montserrat. We went for a walk, and was about a mile out viewing the monastery; the bells peeled out. The perception of depth was stunning, shut ones eyes and you can hear the bells a mile away with amazing accuracy.
 
Then we were lucky enough to hear the choir in the basilica. I was 150 feet away, and again, shut ones eyes and the sound was 150 feet away. It was glorious.
 
But the amazing thing is how the brain manages to compute depth from very tiny cues and get it to such accuracy and we take it entirely for granted.
 
So far early versions of Dave has been shown at a few shows and listeners have reported back about how unusual the depth perception is with Dave. Now this is due to the DAC resolving accuracy of very small signals - for some reason any small non-linearity of small signals upsets the brains ability to determine depth. What is curious is that there seems to be no limit to how accurate the linearity needs to be; Dave's noise shapers are accurate to -350 dB and this was the performance required by depth perception. Indeed, the brain may be sensitive to even smaller levels, but 350 dB is the best I can do with current FPGA's. But if you had said 2 years ago that one would need 350 dB performance from a noise shaper to get proper depth perception I would have said you were completely mad, as this is ridiculously small levels. But I have done thousands of depth listening tests, and always came to the same conclusion - very very small errors are significant. No doubt the sound science brigade will be on my back about this; but sound science is about observation not pet theories; and the observations are saying that something very weird is going on about depth perception (something which our understanding of how the brain achieves this level of accuracy is very limited).
 
Getting back to Dave and classical music. Sure classical music is not close miked, and so perceiving depth would be beneficial to that genre. But depth is often added in recordings by adding reverb. Also, its about small signal linearity which is useful for detail resolution as well as depth perception. But because Dave's depth perception is so much deeper than other DAC's its easy to latch onto that aspect of performance - its about four times deeper with recordings that have good depth than Hugo for example. But there is a lot more to Dave than just depth.
 
On the design of Dave, I was at one point improving smoothness and warmth. It got richer and darker, almost to the point where it sounded too dark and smooth - transients were starting to sound soft. Now this aspect was based on solid engineering, that of improving noise floor modulation, so I knew it was more transparent for certain. But it was sounding too rich and dark. Now that's OK - nobody knows what a perfect DAC sounds like (neutral just means average really), so I was prepared to live with it. But then I discovered what Hugo's ability to resolve the timing of notes - the perception of instruments starting and stopping - came from, and once found it I could maximise it due to the size available on the FPGA.
 
By maximising the timing aspect, I got Dave to sound much faster, tighter and leaner - the perfect remedy to something sounding too soft and smooth. Now again this performance is engineering based and is fundamentally more accurate and transparent.
 
So what does this mean? Well against Hugo, Dave has much more depth, which you can easily perceive and you don't need to do an AB test. If you hear depth that is deeper than anything ever heard from an audio system then you know something is better. But with Dave being at the same time faster tighter and more dynamic and also richer and darker than Hugo, then you need to do an AB test to perceive that aspect. 
 
And another point - depth is really useful for AV, a lot of depth is recorded onto films and it really makes a big difference to enjoyment having a huge sound stage.
 
Rob
 
Oct 30, 2015 at 5:47 AM Post #607 of 25,842
  Dave is in a different league to the QBD76. Its like comparing an iphone 6 to a phone from 10 years ago - that's how much things have moved on!
 
Rob

 
Yes technology move forward, so... now it is the BLU that need to be upgraded !  Indeed, the BLU is very old compared to the DAVE ! :wink:
 
Oct 30, 2015 at 6:36 AM Post #609 of 25,842
Thanks for the reply Rob. Your last point about films had not occurred to me and I am sure it would add to greater realism.
 
I will be listening out for the depth perception in recordings of classical music against those of other music genres. Modern reverbs are good but I doubt they will fool the magnifying-glass capabilities of something like DAVE much in the same way that modern makeup artists are often compromised by the clarity of HDTV. 64 bit precision mixes and mastering has made a big improvement on the placing of images in a mix but the sense of depth is likely still to be superior with classical recordings simply because it is 'real' ambience as opposed to 'designed' ambience. Modern reverbs including convolution reverbs are much improved but are still not the real deal when judging depth imo. 
 
I am interested in Chord's move into A/D converters also Rob. I have used Prism converters for personal use and they are still ubiquitous in top studios around the world. They are highly regarded. However, I think generally A/D conversion is still in the dark ages. It is not particularly evident when mastering a whole mix from an analogue tape but (as I have mentioned before) set up a decent condenser mic and feed it into a top converter at 88khz 24 bits, have a vocalist sing a phrase for 'take one' and then sing exactly the same phrase and pitch for 'take two'. Now play back the takes simultaneously. The sound of the two recordings will not sit well together. It will sound dry, grainy, unnatural, even metallic in some cases. Double-tracking is the best way that I know to demonstrate how badly modern converters still handle the process of analogue to digital and back. A double-tracked lead vocal on an analogue tape by contrast is a useful process and a trick used by producers for decades to gain great power and presence for the lead vocal but in the digital domain, unless hidden by effects it is hideous imo. If Chord can design professional converters that still sound natural under such a test then I think you are likely to be very popular among sound engineers. :)
 
PS: I would not underestimate the business potential of targeting the home studio market once you have conquered the big studios btw. It is a large market these days.
 
Oct 30, 2015 at 1:42 PM Post #610 of 25,842
Thank you for your kind comments.


The perception of depth is a weird phenomena and something we take for granted. I am on holiday in Catalan, Spain and yesterday visited the monastery at Montserrat. We went for a walk, and was about a mile out viewing the monastery; the bells peeled out. The perception of depth was stunning, shut ones eyes and you can hear the bells a mile away with amazing accuracy.

Then we were lucky enough to hear the choir in the basilica. I was 150 feet away, and again, shut ones eyes and the sound was 150 feet away. It was glorious.

But the amazing thing is how the brain manages to compute depth from very tiny cues and get it to such accuracy and we take it entirely for granted.

So far early versions of Dave has been shown at a few shows and listeners have reported back about how unusual the depth perception is with Dave. Now this is due to the DAC resolving accuracy of very small signals - for some reason any small non-linearity of small signals upsets the brains ability to determine depth. What is curious is that there seems to be no limit to how accurate the linearity needs to be; Dave's noise shapers are accurate to -350 dB and this was the performance required by depth perception. Indeed, the brain may be sensitive to even smaller levels, but 350 dB is the best I can do with current FPGA's. But if you had said 2 years ago that one would need 350 dB performance from a noise shaper to get proper depth perception I would have said you were completely mad, as this is ridiculously small levels. But I have done thousands of depth listening tests, and always came to the same conclusion - very very small errors are significant. No doubt the sound science brigade will be on my back about this; but sound science is about observation not pet theories; and the observations are saying that something very weird is going on about depth perception (something which our understanding of how the brain achieves this level of accuracy is very limited).

Getting back to Dave and classical music. Sure classical music is not close miked, and so perceiving depth would be beneficial to that genre. But depth is often added in recordings by adding reverb. Also, its about small signal linearity which is useful for detail resolution as well as depth perception. But because Dave's depth perception is so much deeper than other DAC's its easy to latch onto that aspect of performance - its about four times deeper with recordings that have good depth than Hugo for example. But there is a lot more to Dave than just depth.

On the design of Dave, I was at one point improving smoothness and warmth. It got richer and darker, almost to the point where it sounded too dark and smooth - transients were starting to sound soft. Now this aspect was based on solid engineering, that of improving noise floor modulation, so I knew it was more transparent for certain. But it was sounding too rich and dark. Now that's OK - nobody knows what a perfect DAC sounds like (neutral just means average really), so I was prepared to live with it. But then I discovered what Hugo's ability to resolve the timing of notes - the perception of instruments starting and stopping - came from, and once found it I could maximise it due to the size available on the FPGA.

By maximising the timing aspect, I got Dave to sound much faster, tighter and leaner - the perfect remedy to something sounding too soft and smooth. Now again this performance is engineering based and is fundamentally more accurate and transparent.

So what does this mean? Well against Hugo, Dave has much more depth, which you can easily perceive and you don't need to do an AB test. If you hear depth that is deeper than anything ever heard from an audio system then you know something is better. But with Dave being at the same time faster tighter and more dynamic and also richer and darker than Hugo, then you need to do an AB test to perceive that aspect. 

And another point - depth is really useful for AV, a lot of depth is recorded onto films and it really makes a big difference to enjoyment having a huge sound stage.

Rob


This sounds very promising!

How about harshness from the DAVE?
Very often very analytical / detailed DAC's sounds harsh = digital sound signature.

I feel this on the Hugo and i hope its not the same with DAVE ? :wink:
 
Oct 30, 2015 at 2:04 PM Post #611 of 25,842
This sounds very promising!

How about harshness from the DAVE?
Very often very analytical / detailed DAC's sounds harsh = digital sound signature.

I feel this on the Hugo and i hope its not the same with DAVE ? :wink:


When I listened to Dave at the audio east show, I didn't detect harshness or a digital sound. The piano playing I heard was very very realistic and analogue sounding :)
 
Oct 30, 2015 at 3:33 PM Post #612 of 25,842
@Robb Watts

Curious about how Dave's power supply is. Dave is like the size of some other dac's linear power supply. What is Dave doing to deliver clean power? Does it have a small battery or caps like the Hugo tt? Does need to a ps audio regen or other filters to perform better?
 
Oct 30, 2015 at 5:00 PM Post #613 of 25,842
Rob, it's always a pleasure to read your ideas and experiences that you kindly share with us. More exciting than many crime thrillers. Even bordering on SciFi stories!
wink.gif
 
 
Oct 30, 2015 at 7:47 PM Post #614 of 25,842
When I listened to Dave at the audio east show, I didn't detect harshness or a digital sound. The piano playing I heard was very very realistic and analogue sounding :)


My MSB Analog play all music with a efortless sound without any harshness, and that is something i rank very high in a dac.

The Hugo got a very realistic sound but do not have the fine smooth rich musicality soundstage and precision dept like the Analog, and sounds more harsh, and i hope DAVE do not have more of does not so nice characteristics :wink:

MSB Analog= Musical and easy to listen to!
Chord Hugo= Are like a instrument for the laboratory, and are not as musically smooth..


Otherwise i keep the Analog ..

Would be a good think to send out DAVE to some respected reviewers pretty soon, to hype and spread the word of this hopfully extremely great product.
 

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