Another project, all digital DDX amplifier

[SoldierAnt76]

It looks like the Hifimediy site has a discussion board now, so they might not be checking this thread regularly anymore. You might try posting your question at Hifimediy Forums

[AlexScan]

Yes audiophonics TK2050 and DDX product are made by Hifimediy.

[hifimediy]

Originally Posted by juanito

Hi, just out of curiosity: is this similar to audiophonics STA328 from france?
Module Amplificateur - Audiophonics STA328 - Module Amplificateur 2.0/2.1 Class D + DAC + DSP
They also sell the TK2050 from hifimediy:Module Amplificateur - Module Amplificateur ST505 2x100W 4 ohms
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

Hi, Nicolas who runs audiophonics.fr is one of my friend, so it's not strange to see some board there. And it's ok to use DDX with S-350 27V.

[goosewing]

I'm interested in using these amps to power a pair of 3 way speakers I have under construction. I would run the MiniDSP 2x8 digital dsp in front and hence could implement all crossover functions in that and could flexiblt route the required six output channels to any combination of four stereo spdif outputs.

a) Ideally I would like to be able to run two DDX amps as 3 channel amps rather than 2.1 , for this an extra spdif input would presumably be needed. Is this possible?

b) Second best would be to still use two DDX amps in 2.1 mode for which I could route tweeter (plus possible woofer output) to channel 1, mid plus woofer output to channel 2 and use the on board Xover to route the woofer output to channel 3. For this I would need a reasonable Xover slope - what slope is implemented in the Xover please? Also I would need the crossover be both low pass to channel3 and high pass to channel 1/2 - would this be possible?

c) The easiest but the one I don't want to do would be simply to use 3 DDX amps in 2.0 mode. This doesn't fit my plans of locating eah amp at the speakers location, hence I really need 3 channel amps not 2 channel.

Could you make a) or b) possible?

Rgds,
Rob.

[soundcheck]

Hi.

I had the same project in mind.

The problem is that

1. the whole amp layout is stereo
2. the DDX controller is summing up L/R for the woofer channel.

You won't get around 2*2 amps.
Which would still match the MiniDSP specs though.


I'd also prefer to go with one SPDIF/Toslink to each of my speakers btw.

Let us know if you find a better solution.

[goosewing]

Originally Posted by soundcheck

Hi.

I had the same project in mind.

The problem is that

1. the whole amp layout is stereo

Yes it would be nice if it was 3.0 not stereo :-) but a stereo layout for each 3way speaker isn't necessarilly bad. Remember that we should be able to supply bass output along with mid on one channel (or both) and leave the amp to extract it to channel 3 with its Xover.

Originally Posted by soundcheck

2. the DDX controller is summing up L/R for the woofer channel.

This seems like a non issue to me as there isn't going to be much woofer information to be summed from the tweeter channel signal after all :-) There again if it was wanted there could be, we could route tweeter+woofer content on channel 1 and mid+woofer content on channel 2 if that would help at all. There is a matrix mixer in the DSP to achieve this.

Originally Posted by soundcheck

You won't get around 2*2 amps.
Which would still match the MiniDSP specs though.

In this configuration I wouldn't actually use the MiniDSP but their nanoDigital 2x8k and then do exactly as you suggest in running a single SPDIF to each speaker.

Originally Posted by soundcheck

I'd also prefer to go with one SPDIF/Toslink to each of my speakers btw.

Let us know if you find a better solution.

Well I do have an alternative but I would certainly prefer this hifimediy amp if it could be configured 3.0. I suspect that I'll have to accept 2.1 though forcing reliance on the internal Xover, the deal breaker then would be how well that Xover is implemented.

As I think has been said before what would find an instant market would be a 'simple' 3/4 way medium power i2s or spdif input amp compatable with the MiniDSP range.

[soundcheck]

Hi there.

Just installed my DDX V2.

No tweaks, no nothing. (for now)

After a couple of tracks the amp shows IMO great potential.

It's IMO much better then V1.

Very nice.

I'll let him break in for a while.

Then I'll start the usual tweak sessions:

OSCON SEPCs
Wuerth coils
Panasonic FMs (or similar)


3.3V LiPoFe4 supply.


I'd find it great if HifiMe would do the "tweaking" for us and introduce above
pretty standard parts. They'd just charge 10-20$ extra for those quality parts.

I'd love, if they'd introduce a "jumper" that would allow to choose for external resp. internal 3.3V supply.

Cheers

[Havoc08]

How do you find the sound quality soundcheck? Compared to TK2050 and a good DAC preferably. Pure digital nirvana or similar/worse?

[soundcheck]

Originally Posted by Havoc08

How do you find the sound quality soundcheck? Compared to TK2050 and a good DAC preferably. Pure digital nirvana or similar/worse?

I do find the SQ awesome.

I directly feed the DDX with my tweaked SB Touch. That's all I need. ( I tried a lot of other stuff in the past)

A friend of mine just compared the new stock DDX to a tweaked Buffalo II DAC.
Out of the box the DDX gets en par with his tweaked DAC/amp solution.

With a little tweaking, there's more to gain. That's my experience with the V1 amp.

[Havoc08]

Great thanks! Look forward to more input on this topic as I am not skilled enough to handle issues like V1. Also the fact that we are talking software and not hardware makes it difficult to tweak?