Another project, all digital DDX amplifier

[soundcheck]

Originally Posted by Kjeldsen

MiniDSP have shown they can do DSP, and hifimediy that they can do amps. Maybe it would be more beneficial if hifimediy and MiniDSP made some collaboration, and made a configuration so a hifimediy amp could connect to miniDSP via I2S.

I'd say first HifiMe has to prove that they are able to supply flawless "digital" gear. My DDX sounds good, really good after the mods. However. There's a major flaw in the design and it seems to take them ages to get it fixed.
That's the way how you kill your business.

MiniDsp:

Most of the MiniDsp stuff comes with limiations (samplerates/processing power etc).

I'd prefer the DSP work to be done on a PC. I'd rather opt for a WavIO USB or ExaU2i interface feeding one or more channels via I2S.


Cheers

[Kjeldsen]

I don't see the limitations of MiniDSP, only the possibilities - and that is intuitive software and a cheap product that will meet many customers needs. If you want more then look elsewhere like the DEQX og PC based. But for me PC based is not an option. I have tried, and it is far from beeing userfriendly.

The highend segment is not that big, and the products actually exists (DEQX, HOLM, Tact/Lyngdorf and some PRO audio DSP's

[i2k92]

There's new version about this amp on hifimediy site. But there's no information if the problem has been solved or not.

[Kjeldsen]

Yes, it clearly states that the noise problems have been solved.

"We have solved the noise bugs present in the first version of this amp!"

[soundcheck]

Originally Posted by i2k92

There's new version about this amp on hifimediy site. But there's no information if the problem has been solved or not.

According to the feedback from HifiMeDiy all problems are resolved.

They've done a complete redesign.

V2 comes with quite some interesting new features.

* WM8805 interface chip ( 50ps jitter - much less then tha CS8416 used before)
* no more resampling
* better clock
* no output relais
* different power amp chip on channel 1+2
* smaller heatsink
* 2.0 operation ( you can turn off the bass channel)
* remote control
* better display (volume shown as numbers)

and more.

Looks really promising. Especially that they managed to get rid of the V1 problems.

Of course the price is 30$ higher than before. We'll find out soon if it's worth it.

Two of my proposals they unfortunatley havn't managed to introduce:

1. A pulsetransformer on the SPDIF input.

2. Full shielded output transformers a la Wuerth

That's the point where DIY begins. No dealbreakers IMO. Especially
if you run a pulsetransformer on the transmitter side or if you run
Toslink.


I placed my order already. Looking forward to the new board.


And thx a lot to HifiMeDiy for listening to users feedback.

Cheers

[i2k92]

Originally Posted by soundcheck

According to the feedback from HifiMeDiy all problems are resolved.

They've done a complete redesign.

V2 comes with quite some interesting new features.

* WM8805 interface chip ( 50ps jitter - much less then tha CS8416 used before)
* no more resampling
* better clock
* no output relais
* different power amp chip on channel 1+2
* smaller heatsink
* 2.0 operation ( you can turn off the bass channel)
* remote control
* better display (volume shown as numbers)

and more.

Looks really promising. Especially that they managed to get rid of the V1 problems.

Of course the price is 30$ higher than before. We'll find out soon if it's worth it.

Two of my proposals they unfortunatley havn't managed to introduce:

1. A pulsetransformer on the SPDIF input.

2. Full shielded output transformers a la Wuerth

That's the point where DIY begins. No dealbreakers IMO. Especially
if you run a pulsetransformer on the transmitter side or if you run
Toslink.


I placed my order already. Looking forward to the new board.


And thx a lot to HifiMeDiy for listening to users feedback.

Cheers

So I'll wait for your review before placing my order :-) (they have 2 new product: DDX and new ES9023 DAC, must prioritize one of them)

[soundcheck]

Yep. I'll write up some impressions. Let see when they start shipping.


A correction of my earlier post: Not "output transformers" --> "output coils"

[SoldierAnt76]

It's funny. I haven't thought much about digital amps for over a year now, yet it just occurred to me today to go back to diyaudio.com and see if Hifimediy ever got his DDX amplifier working.

Glad to see the problems got solved. Any chance we could get a picture of the front of the display?

[juanito]

Hi, just out of curiosity: is this similar to audiophonics STA328 from france?
http://www.audiophonics.fr/audiophon...ac-p-6807.html
They also sell the TK2050 from hifimediy:http://www.audiophonics.fr/module-am...ms-p-5883.html
Are the same?, in other words, is it the same if I purchase from audiophonics or hifimediy web site?

By the way, for the digital amplifier can I use a meanwell SMPS s-350 27v?
Thanks

[juanito]

Is it still working? Any success with this digital amplifier?