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DDX 320 - Improvement Proposals

DDX 320 - Improvement Proposals

Hi



i use for one day the V2 : Great sound but a littble bit shy for one pair of my speakers Lynfield 400 L which need a lot of curent (85 db- - homs)) in the bass. Great on my Proac D15 (8homs- 88 db) or Kef 104/2 (4 homs-92 db) : good sound !



In the feet of Soundcheck for him technic advices with the forumers of DIY-Audio (thanks to you all with Nick for the V2), I hope later, just in user perspective, for a three way active DDX with the choice of cut first to fourth order with one SMPS for the bass and one SMPS shared between mid an treble... future big sucess I'm sure ! Look what Hypex is trying to do: a digital active filter preamp with its amps behind:... but not a full FDA design if I understand well. So why not to be the first in DIY world.



.... And a user manual for the futurs amp (had difficulty to connect well thr rotary which has not the same whay of working according you plug it !).



wating for my remote to play with the cut off in the two way ob plan perspective !



regards
Looks promsing.

Put me on the list of beta testers. ;) You know my e-mail.

Thx.
One more wish. ;)

Please. Leave the Toslink input on your Rev 2.

We have double inputs on V2.
One more wish. ;)

Please. Leave the Toslink input on your Rev 2.
Looks promsing.



Put me on the list of beta testers. ;) You know my e-mail.



Thx.
Hi, soundcheck.
Many thanks to your focus and suggestions. I made something new these days and hope we can success.
20
Hi there.

Let's continue with some proposals:

1. Different PIC configurations.

It would be nice to have an amp with swappable PICs allowing different firmware settings. (see Twisted Pear Buffallo)

I'd really like to see a two channel model with all internal DSP ( EQs/Volumecontrol etc on neutral)
You can sell such a PIC at a little extra. I would order both or more to compare..


2. The HifiMe 4398 DAC comes with a much better input stage (WM8804-50ps jitter ) compared to the DDX320.
I guess you could easily use that one for the amp. You might also solve the noise issue with this.


Last. Perhaps you could tell us if you consider to revise the DDX320??

THX
Hi Hifimediy.

Any progress on the subject?? Can we expect a new board sooner or later?

THX
Hi, guys.

An I2S version sounds as good idea but we have to know the input sample rate and oversampling rate, and then we need to TELL the ddx chip by MCU(only that will make ddx chip works). Also removing cs8416 is not ok, the mcu will stop and the board will not working then.

But some ideas from you will help me for the new design, so thanks~~

Yubing



Have a look at the TI purepath chips. Probably much easier to handle.

The power chips are pin compatible for different power demands. And volume control is probably much better.



You can also implement very easily multichannel amps.
Hi, guys.
An I2S version sounds as good idea but we have to know the input sample rate and oversampling rate, and then we need to TELL the ddx chip by MCU(only that will make ddx chip works). Also removing cs8416 is not ok, the mcu will stop and the board will not working then.
But some ideas from you will help me for the new design, so thanks~~
Yubing
Hi guys.

What do you think about a simple I2S version of that amp? Just take the CS8416 and the clock out.







There are many USB to I2S or SPDIF to I2S modules out there.





I think people would love it.





You could add your own SPDIF-I2S or USB-I2S interface later on. I think a modular approach would just be fine.





I'm almost sure that your noise problem would also be gone on the I2S version only.



Cheers



I totally agree with this.

Also would be great removing the mcu and the external user interface, and adding a sheet with a sort of i2c instruction list.

So we can easily rewrite our personal user interface (standard interface Sucks) and also access to the dsp options of the chip.
Hi guys.

Any progress?

What do you think about a simple I2S version of that amp? Just take the CS8416 and the clock out.



There are many USB to I2S or SPDIF to I2S modules out there.


I think people would love it.


You could add your own SPDIF-I2S or USB-I2S interface later on. I think a modular approach would just be fine.


I'm almost sure that your noise problem would also be gone on the I2S version only.


Let me know if it would be helpful to go after a group-buy for such a device?? What would be the minimum batch size to
get you start working on the subject??


It might also be very helpful if you could tell me how to feed I2S to the amp. I figured out the soldering joints. But I guess I'd have to remove the CS 8416 and the permanent clock to make it work. I'm also not sure if your controller
would accept a missing CS 8416?!?!?

Giving me any directions would be great!!



Cheers
Thanks again for all your input and suggestions, really appreciate that. we are looking into it, but I can't promise any timeframe.
Yes, that channel seperation issue was one of the things I noticed and which makes it easy to hear when the amp is in "noise mode".

I'd still guess it's a reset scheme resp. reset timing issue.

You should have a look at the TI chips and application notes. I do think the TI chips are the better ones.
24db volume control over VCC on the power chip. IMO much better.

I'd love to see you guys coming up with a simple I2S NO-FRILL module. Just controller and amp. No resampling no SPDIF.

Cheers
Hi folks.

Any news?

Just to mention it.

When listening to the strange noise flaw. I got the feeling that some left channel content makes it into the right channel (as a distorted noise). Something must go pretty wrong in your setup.

Cheers

Thanks again for all your input and suggestions, really appreciate that. we are looking into it, but I can't promise any timeframe.
Yes, that channel seperation issue was one of the things I noticed and which makes it easy to hear when the amp is in "noise mode".
Hi folks.

Any news?

Just to mention it.

When listening to the strange noise flaw. I got the feeling that some left channel content makes it into the right channel (as a distorted noise). Something must go pretty wrong in your setup.

Cheers
Hi, thanks a lot for your feedback. Apologize we haven't responded to the diyaudio thread. There are holidays in China now, we'll respond as soon as possible.
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