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Hi-end DSP based multi-channel integrated Preamp/Crossover/DAC project

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#662
Tranquility Bass said:
On another note does anyone know of a suitable remote control that I can standardize on ? It has to have the following features:-

NEC RC protocol
BUTTONS:- Left, Right, Up, Down, Enter, Mute, Standby

I have tried a plastic Apple RC from ebay but it doesn't appear to be NEC protocol.

cheers
Click to expand...

Hifiduino blog contains information about apple remote. Hope this can help you.

https://hifiduino.wordpress.com/apple-aluminum-remote/

Regards
 
#666
chalkandtalk said:
Hi
I wondered whether it would be possible to get my hands on one of these units?
Do you have plans to sell them? If so when do you think they will be available?

thanks

Aidan
Click to expand...

Hi Aidan

There have been interest from a number of people who have put up their hands to become beta testers. The first small run of boards will mainly be allocated to beta testers to iron out any bugs in the firmware etc. If all goes well this will be followed by a larger production run available to the general public.

I've already done a lot of the testing and debugging but mainly in 2 channel mode. But it would be good to get it operating in an active speaker environment. I have one interested party local to me willing to test the prototype with their 2 way active speakers so it will be a good test of the hardware in an actual real world setup.

regards
david
 
#670
Hello TB,

I just discovered this thread. Great project! And it seems you made it all the way to the end. Outstanding! Great choice for DACs. I will be definitely interested in for my second system. I am not too excited about opamp outputs but I do not see problem exchanging it for something else. I do understand, with anything multichannel it is quite a task doing anything else than opamps.

If I could say, with these DACs power supplies are the most important part and the better they are the better they sound.
I built my digital crossover based on ESS9012 chips and it sounds great. Here is the link if you have an interest:

http://www.diyaudio.com/forums/pass-labs/186848-babelfishing-mighty-ar2.html#post4515874

Best of luck with your project!

AR2
 
#671
AR2 said:
Hello TB,

I just discovered this thread. Great project! And it seems you made it all the way to the end. Outstanding! Great choice for DACs. I will be definitely interested in for my second system. I am not too excited about opamp outputs but I do not see problem exchanging it for something else. I do understand, with anything multichannel it is quite a task doing anything else than opamps.

If I could say, with these DACs power supplies are the most important part and the better they are the better they sound.
I built my digital crossover based on ESS9012 chips and it sounds great. Here is the link if you have an interest:

http://www.diyaudio.com/forums/pass-labs/186848-babelfishing-mighty-ar2.html#post4515874

Best of luck with your project!

AR2
Click to expand...

Hi AR2

Nice work and I think I have seen your project before 😉

I have spent a quite a bit of time designing with the Sabre DAC which is why I was reluctant to change it for another vendors DAC. I paid particular attention to the layout and power supplies using low noise regulators. The IV convertor using opamps is straight out of the app notes and basically saves a lot of board space compared to a discrete design.

cheers
david
 
#672
Tranquility Bass said:
For those interested I have posted my first video of the DSPXO on youtube. Sorry for the shaky video 🙁 Thanks to bkdog for his valuable time and the use of his system. It was great catching up with another diyer 😉

https://www.youtube.com/watch?v=2_kge4eGNgA

cheers
david
Click to expand...

Ha exactly what I'm planning to do.
Fellow Quad ESL-63 user here.
Please make it available asap

Also what's the chassis form factor here?
It would be awesome to have a rackmount-able front panel.
 
#675
Tranquility Bass said:
The prototype uses a 2RU case minus the mounting holes.

cheers
Click to expand...

lhjhbB9.gif
 
#677
Sorry for not keeping you all updated. Been quite busy these last few months.😱

OK I have recently received the ES9028PRO samples from EssTech. The board layout needed some changes to accommodate these new devices as they are not quite a drop in replacement to the ES9018S. But they have some really nice new features that the ES9018 does not have and well worth the upgrade given that they are almost the same price.

ES9028PRO_Samples.jpg


There is new updated board hardware and a whole new spec and feature brief which is twice as long as the original and reads like a wish list. Won't be publishing this until it is released for obvious reasons 😉 Suffice to say that many of the features that you all wrote to me about have been incorporated so thanks for the valuable feedback and suggestions. Keep the ideas rolling in - it's been really helpful in shaping this product to where it is 😉

Quite often some of the feature requests where I wrote back saying that it did not have at the time have now been incorporated into the hardware and firmware, so don't be surprised to see them. Sometimes I have to think about things for a while to realise that there is a way of achieving them. For the people who have been fortunate enough to see the prototype in action have already had a sneak preview of some of the new features but there are now plenty more to come.

As for board availability I have the board assembly files zipped up ready to send off to the pcb assembly house. Just need to get some quotes first. Once again sorry for the delays but patience is a virtue.

cheers
david
 
#679
Please don't make this a never ending project, it will fail.
Define set of specs, publish them (once the first batch is ready to ship or the shipping date is announced) and keep the production rolling, otherwise...

Good luck!!!

PS

Some things will be possible to upgrade vis firmware and others will need to wait for v2. There's allways something which pops out and could be added.
 
Last edited:
#680
mirekti said:
Please don't make this a never ending project, it will fail.
Define set of specs, publish them (once the first batch is ready to ship or the shipping date is announced) and keep the production rolling, otherwise...

Good luck!!!

PS

Some things will be possible to upgrade vis firmware and others will need to wait for v2. There's allways something which pops out and could be added.
Click to expand...

It's not quite as simple as that. For example the LCD display that I was using is no longer available so I have had to redesign the board to accommodate another one with the same LCD driver but different pin-outs.

The other issue is that I can't really afford to get a run of boards made which are wrongly assembled or have a design fault on my part because being surface mount makes it difficult to rework. It only takes the board assembler to substitute the wrong components and you can end up with a nightmare scenario with a worthless pile of junk that is no good to anyone and that is money down the drain.

But your underlying point is duly noted.

cheers
david
 
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